CN105897413A - Phase modulation polarization coded QKD system based on sagnac ring - Google Patents
Phase modulation polarization coded QKD system based on sagnac ring Download PDFInfo
- Publication number
- CN105897413A CN105897413A CN201610362025.5A CN201610362025A CN105897413A CN 105897413 A CN105897413 A CN 105897413A CN 201610362025 A CN201610362025 A CN 201610362025A CN 105897413 A CN105897413 A CN 105897413A
- Authority
- CN
- China
- Prior art keywords
- light
- polarization
- phase
- optical
- sagnac ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Theoretical Computer Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a phase modulation polarization coded QKD system based on a sagnac ring. Horizontal polarization light and vertical polarization light propagate in a polarization maintaining optical fibre clockwise and anticlockwise respectively; the horizontal polarization light reaches a polarization beam splitter PBS1; the vertical polarization light reaches the polarization beam splitter PBS1; after being combined in the PBS1, the horizontal polarization light and the vertical polarization light exit to an optical attenuator VOA through an optical circulator Cir1, and are attenuated to the single photon level by an optical attenuator VOA; therefore, safety transmission on a channel is ensured; then, the horizontal polarization light and the vertical polarization light are combined with light sent by a synchronous optical laser Laser_S to a public channel through a wavelength division multiplexer WDM; after reference selection is carried out through a polarization controller (PC3), two sets of references orthogonal in a polarization direction are separated through a polarization beam splitter PBS3; and detection counting is carried out through a single-photon detector. In a word, the phase modulation polarization coded QKD system disclosed by the invention is good in stability, simple in structure and low in cost.
Description
Technical field
The present invention relates to the quantum key dispatching system of a kind of polarization characteristic based on light quantum, particularly relate to based on
The QKD system of the phase-modulated polarized coding of sagnac ring.
Background technology
The theorem that quanta cryptology technique cannot be cloned based on Heisenberg uncertainty principle and single quantum is demonstrate,proved physically
The bright a kind of encryption technology that can reach to be perfectly safe.Based on its absolute safety, this technology is in military affairs, commercial affairs and department of banking
The aspects such as system have good application prospect.Polarization is one of fundamental physical quantity of light quantum, can be used for realizing quantum information
The valuable source of technology, it is achieved to its effective utilization, the development to quantum information technology has great importance.Based on light quantum
The quantum key dispatching system (QKD) of polarization characteristic be also currently to be in daily use and updating the quantum cryptography system of innovation
System.
Quanta cryptology technique comes into practical stage, the stability of quantum cryptography system, integration and warp at present
Ji property is the problem being currently needed for paying close attention to and solving.Stability include the operating each module of consideration system stability (temperature drift,
Vibrations, change of polarization state etc.), integration and economy are it is considered that cost that in system, transmitting terminal and receiving terminal are used
Higher optics and hardware control module, on the premise of can not changing principle and safety, try hard to be use more
Save cost and make system more stable, light.
Summary of the invention
It is an object of the invention to provide a kind of phase-modulation based on sagnac ring inclined for above-mentioned the deficiencies in the prior art
Shake the QKD system encoded, this QKD system good stability of phase-modulated polarized coding based on sagnac ring, simple in construction, one-tenth
This is low.
For realizing above-mentioned technical purpose, the technical scheme that the present invention takes is: based on sagnac ring phase-modulated polarized
The QKD system of coding；Including transmitting terminal Alice and receiving terminal Bob；Believed by optical fiber between transmitting terminal Alice and receiving terminal Bob
Europe, road connects；It is characterized in that: transmitting terminal Alice include laser instrument Laser_Q, laser instrument Laser_S, Polarization Controller PC1,
Optical circulator Cir1, optical attenuator VOA, wavelength division multiplexer WDM and transmitting terminal sagnac ring；Transmitting terminal sagnac ring includes polarization
Beam splitter PBS1, phase-modulator PMA, optical rotator rotator1 and chronotron Delay1；Polarization beam apparatus PBS1, phase place are adjusted
Use polarization maintaining optical fibre to connect successively between device PMA processed, optical rotator rotator1 and chronotron Delay1, chronotron Delay1 and
It is also adopted by polarization maintaining optical fibre between polarization beam apparatus PBS1 to connect；Phase-modulator PMA is used for regulating single polarization；Laser instrument Laser_
Q and laser instrument Laser_S is used for producing pulsed light, and the pulsed light that laser instrument Laser_Q produces is used for system as quantum signal
Coding, to generate key；The pulsed light that laser instrument Laser_S produces, as synchronizable optical, synchronizes for system two end signal；Polarization
Controller PC1 for being turned into 45 ° of line polarized lights and inciding in polarization beam apparatus PBS1 by quantum optical signal；Polarization beam apparatus
PBS1 for being divided into horizontal polarization light and orthogonal polarized light, horizontal polarization light and orthogonal polarized light edge respectively by 45 ° of line polarized lights
Propagate in polarization maintaining optical fibre clockwise and anticlockwise；Horizontal polarization light sequentially pass through phase-modulator PMA, chronotron Delay1 and
Optical rotator rotator1 arrives polarization beam apparatus PBS1；Orthogonal polarized light sequentially passes through optical rotator rotator1, chronotron
Delay1 and phase-modulator PMA arrives polarization beam apparatus PBS1；Optical rotator rotator1 is for by along propagation clockwise
Horizontal polarization light half-twist becomes orthogonal polarized light, level will be become inclined along the polarization half-twist of the orthogonal polarized light propagated counterclockwise
Shake light；Chronotron Delay1 be used for the time delay waiting time, the described waiting time be when phase modulation required clockwise
Phase place clockwise or counterclockwise direction is only modulated with the polarized light propagated counterclockwise, and the wait needed in another direction
Time；Phase-modulator PMA is used for the phase place of modulation polarized light clockwise or counterclockwise direction,；Horizontal polarization light is with vertical
Straight polarized light after PBS1 converges through optical circulator Cir1 outgoing to optical attenuator VOA and by optical attenuator VOA attenuation to setting
Fixed light intensity, the light sent with laser instrument Laser_S afterwards through wavelength division multiplexer WDM multiplexing close road to common signal channel, then
Receiving terminal Bob is arrived by fibre channel transmission；
Receiving terminal Bob includes high light detector Detector, wavelength division multiplexer DWDM, single-photon detector SPD, polarization control
Device PC2 processed, Polarization Controller PC3, optical circulator Cir2, polarization beam apparatus PBS3 and receiving terminal sagnac ring；Receiving terminal
Sagnac ring includes polarization beam apparatus PBS2, phase-modulator PMB, optical rotator rotator2 and chronotron Delay2；Light arteries and veins
After being demultiplexed by wavelength division multiplexer DWDM after being flushed to reach receiving terminal Bob i.e. after light splitting, synchronizable optical from quantum light respectively along different
Propagated, synchronizable optical is realized the conversion of photoelectricity for system synchronization by high light detector Detector detection；Quantum light pulse
Entered the sagnac ring of receiving terminal Bob, the sagnac of receiving terminal Bob by circulator Cir2 after Polarization Controller PC2 rectifies a deviation
The mode of operation of each optics in ring is with transmitting terminal Alice, the quantum light after the sagnac ring of receiving terminal Bob is modulated
Pulse is after Polarization Controller PC3 selects base, then separates, through polarization beam apparatus PBS3, two groups of bases that polarization direction is orthogonal, then
By electric light purple detector detection counting.
As further improved technical scheme of the present invention, time under double detector pattern, single-photon detector is two groups
Single-photon detector on base visits SPD1 and single-photon detector SPD2.
As further improved technical scheme of the present invention, time under simple detector pattern, single-photon detector is monochromatic light
Sub-detector SPD3；One group of base is through chronotron Delay3 in succession to 50:50 beam splitter BS, and another set base is directly connected to 50:
50 beam splitter BS, two route beam splitter BS close road to single-photon detector SPD3 detection counting.
As further improved technical scheme of the present invention, the delay value of chronotron Delay3 is D, and D=T/2, T are system
Cycle.
As further improved technical scheme of the present invention, the light intensity set is as the light intensity of single photon level.
As further improved technical scheme of the present invention, the light pulse of the horizontal polarization light propagated clockwise isBy becoming after regulation phase-modulatorPolarization beam apparatus is returned through polarization maintaining optical fibre
Become during PBS1The orthogonal polarized light propagated counterclockwise returns to light arteries and veins during polarization beam apparatus PBS1
The quantum state of punching is
As further improved technical scheme of the present invention, light pulse matrix after the sagnac ring of Bob end represents
As follows:Omitting common phase factor, the phase contrast by regulation two ends is the most permissible
Produce each polarization state.Arrive through fibre channel transmission after horizontal polarization light and orthogonal polarized light are by optical attenuator VOA attenuation
When reaching Bob end, horizontal polarization light and orthogonal polarized light all add a common phase factorNow level is inclined
The light pulse of light and orthogonal polarized light of shaking is under matrix represents:
The coding principle of the present invention is that phase-modulated polarized state realizes polarization encoder quantum-key distribution, the side of this principle
Case it has been suggested that and confirm available, but in those schemes, light pulse needs to return to launch around a circle in communicating pair
End, this sagnac ring allowing for phase code interferometry is limited in realizing long haul communication.This programme utilizes ring type
Single polarization phase modulation method, is exactly that both sides are encoded by regulation phase place in simple terms, and Bob end carries out polarimetry, passes in the channel
Defeated is polarization state, and present configuration is simple, it is achieved upper convenient, the most also has feasibility.Present configuration is simple,
Low cost, electricity regulation controls polarization and is better than Mechanical course, and system stability is good, can run up, and future can pass through integrated optics
Technology realizes minute sized encapsulation；When receiving terminal Bob uses time-sharing multiplexing technology, use a detector, and pass through phase
The algorithm answered reaches the detection of theoretically secure, thus reaches to save the purpose of system cost.As it is shown in figure 1, light beam is incident
Mutually orthogonal two-beam is become after polarization beam apparatus PBS1, more respectively along the both direction propagation of same paths, Jing Guoxiang
After the manipulator PMA phase modulation of position, each polarization state of light can be formed at the exit end of polarization beam apparatus PBS1.Receiving terminal Bob is permissible
Realize actively selecting base to measure by regulation phase place, overcome the attack passively selected under base for imperfect BS.In a word, the present invention
Good stability, simple in construction, low cost.
Figure of description
Fig. 1 is the structural principle schematic diagram of the present invention.
Fig. 2 is the structural principle schematic diagram of embodiment 2.
Fig. 3 is phase contrast and polarization state mapping table.
Fig. 4 is key generator matrix figure in tabular drawing 3.
Detailed description of the invention
Embodiment 1
See Fig. 1, the QKD system of this phase-modulated polarized coding based on sagnac ring；Including transmitting terminal Alice and connecing
Receiving end Bob；Connected by fiber channel between transmitting terminal Alice and receiving terminal Bob；It is characterized in that: transmitting terminal Alice includes
Laser instrument Laser_Q, laser instrument Laser_S, Polarization Controller PC1, optical circulator Cir1, optical attenuator VOA, wavelength division multiplexer
WDM and transmitting terminal sagnac ring；Transmitting terminal sagnac ring includes polarization beam apparatus PBS1, phase-modulator PMA, optical rotator
Rotator1 and chronotron Delay1；Polarization beam apparatus PBS1, phase-modulator PMA, optical rotator rotator1 and chronotron
Use polarization maintaining optical fibre to connect between Delay1 successively, between chronotron Delay1 and polarization beam apparatus PBS1, be also adopted by polarization maintaining optical fibre
Connect；Phase-modulator PMA is used for regulating single polarization；Laser instrument Laser_Q and laser instrument Laser_S is used for producing pulsed light,
The pulsed light that laser instrument Laser_Q produces is used for system coding as quantum signal, to generate key；Laser instrument Laser_S produces
Raw pulsed light, as synchronizable optical, synchronizes for system two end signal；Polarization Controller PC1 is for being turned into quantum optical signal
45 ° of line polarized lights also incide in polarization beam apparatus PBS1；Polarization beam apparatus PBS1 is for being divided into level inclined 45 ° of line polarized lights
Shake light and orthogonal polarized light, and horizontal polarization light and orthogonal polarized light are respectively along propagating in polarization maintaining optical fibre clockwise and anticlockwise；
Horizontal polarization light sequentially passes through phase-modulator PMA, chronotron Delay1 and optical rotator rotator1 arrives polarization beam apparatus
PBS1；Orthogonal polarized light sequentially passes through optical rotator rotator1, chronotron Delay1 and phase-modulator PMA arrives polarization point
Bundle device PBS1；Optical rotator rotator1, will for becoming orthogonal polarized light along the horizontal polarization light half-twist propagated clockwise
Polarization half-twist along the orthogonal polarized light propagated counterclockwise becomes horizontal polarization light；Chronotron Delay1 is when time delay waits
Between, the described waiting time is that the required polarized light propagated clockwise and anticlockwise is only modulated clockwise when phase modulation
Or the phase place on counterclockwise, and the waiting time needed in another direction；Phase-modulator PMA is used for modulating clockwise
Or the phase place of the polarized light on counterclockwise,；Horizontal polarization light and orthogonal polarized light after PBS1 converges through optical circulator
Cir1 outgoing, to optical attenuator VOA and by the light intensity of optical attenuator VOA attenuation extremely setting, sends with laser instrument Laser_S afterwards
Light through wavelength division multiplexer WDM multiplexing close road to common signal channel, then by fibre channel transmission arrive receiving terminal Bob；
Receiving terminal Bob includes high light detector Detector, wavelength division multiplexer DWDM, single-photon detector SPD, polarization control
Device PC2 processed, Polarization Controller PC3, optical circulator Cir2, polarization beam apparatus PBS3 and receiving terminal sagnac ring；Receiving terminal
Sagnac ring includes polarization beam apparatus PBS2, phase-modulator PMB, optical rotator rotator2 and chronotron Delay2；Light arteries and veins
After being demultiplexed by wavelength division multiplexer DWDM after being flushed to reach receiving terminal Bob i.e. after light splitting, synchronizable optical from quantum light respectively along different
Propagated, synchronizable optical is realized the conversion of photoelectricity for system synchronization by high light detector Detector detection；Quantum light pulse
Entered the sagnac ring of receiving terminal Bob, the sagnac of receiving terminal Bob by circulator Cir2 after Polarization Controller PC2 rectifies a deviation
The mode of operation of each optics in ring is with transmitting terminal Alice, the quantum light after the sagnac ring of receiving terminal Bob is modulated
Pulse is after Polarization Controller PC3 selects base, then separates, through polarization beam apparatus PBS3, two groups of bases that polarization direction is orthogonal, then
By electric light purple detector detection counting.
Time under double detector pattern, single-photon detector is that the single-photon detector on two groups of bases visits SPD1 and single photon
Detector SPD2；Single-photon detector is visited SPD1 and single-photon detector SPD2 and is used for detecting counting.Chronotron Delay3 prolongs
Duration is D, and D=T/2, T are the system cycle.The light intensity set is as the light intensity of single photon level.The horizontal polarization light propagated clockwise
Light pulse beBy becoming after regulation phase-modulatorReturn partially through polarization maintaining optical fibre
Shake beam splitter PBS1 time becomeWhen the orthogonal polarized light propagated counterclockwise returns to polarization beam apparatus PBS1
The quantum state of light pulse beAfter horizontal polarization light and orthogonal polarized light are by optical attenuator VOA attenuation through
When fibre channel transmission arrives Bob end, horizontal polarization light and orthogonal polarized light all add a common phase factor
The now light pulse of horizontal polarization light and orthogonal polarized light is under matrix represents:
As it is shown in figure 1, after laser instrument Laser1 produces pulsed light, the effect through Polarization Controller PC1 makes 45 °
Line polarized light, and incide in polarization beam apparatus PBS1, at this moment horizontal polarization light can be divided into vertical by polarization beam apparatus PBS1
Polarized light, this two-beam is respectively along propagating in polarization maintaining optical fibre clockwise and anticlockwise.Transmitting terminal Alice is by the single polarization of regulation
Phase-modulator PMA regulate the light pulse of clockwise propagation.And for the light pulse propagated counterclockwise, first pass around one
Optical rotator rotator1 is allowed to polarize half-twist, the most again through the time delay that chronotron Delay1 is certain, just arrives phase place and adjusts
Device PMA processed, now the voltage of phase-modulator PMA has been decorporated.If usedRepresent the light pulse propagated clockwise,
By becoming after regulation phase-modulator PMAPolarization beam apparatus PBS1 time-varying is returned through polarization maintaining optical fibre
ForAccordingly, the quantum state of the light pulse propagated counterclockwise eventually becomes
Two-beam pulse converges at polarization beam apparatus PBS1, is first decayed to certain by optical attenuator VOA1 through optical circulator Cir1
Light intensity, is then passed through fibre channel transmission and arrives receiving terminal Bob, and now two-beam pulse can add a common phase factorThis optical pulse is under matrix represents:
Receiving terminal sagnac ring is identical with transmitting terminal sagnac ring, and receiving terminal Bob is by regulation phase place
Manipulator PMB realizes coding.Now become from the quantum state of polarization beam apparatus PBS2 light pulse outOmit common phase factor, it is understood that by adjusting
Joint phase contrast just can produce each polarization state.
Another advantage of the present invention is exactly that Bob end can realize actively selecting base to measure by regulation phase place, overcomes
Passively select the attack for imperfect BS under base.Two ends phase contrastWith the relation of modulating polarization state as shown in Figure 3: Wo Mengui
Phase bit 0, π represents " 0 " base,Representative " 1 " base, Alice Stochastic Modulation phase place: 0,π,Bob adjusts the most randomly
Phase place processed: 0,π,Bob end is equivalent to select base to measure.As Alice modulation be the phase place on " 0 " base time, Bob modulation
For 0, π, i.e. during the phase place of " 0 " base, it is believed that it selects right base, can become code, if Bob have selected by detectionI.e. during the phase place on " 1 " base, it is believed that it does not select base, in this case, the meeting when communicating pair is to base
It is rejected.Communication key amount forms rule as shown in Figure 4, whereinRepresent that detector has the probability of 50% to detect, 1
(SPD1) representing that SPD1 detector 100% detects, 1 (SPD2) represents that SPD2 detector 100% detects SPD1, SPD2 and receives
Two single-photon detectors of end.
Embodiment 2
As in figure 2 it is shown, the receiving terminal Bob time-division of the QKD system of this phase-modulated polarized coding based on sagnac ring is multiple
By a detector, i.e. single probe sagnac loop systems, being in simple detector pattern, single-photon detector is single photon detection
Device SPD3；One group of base is through chronotron Delay3 in succession to 50:50 beam splitter BS, and another set base is directly connected to 50:50 beam splitting
Device BS, two route beam splitter BS close road to single-photon detector SPD3 detection counting.Now need to consider the equiprobability of two groups of bases,
Thus accomplish theoretic being perfectly safe.Other parts are identical with embodiment 1 no longer to be described in detail.
Claims (8)
1. the QKD system of a phase-modulated polarized coding based on sagnac ring；Including transmitting terminal Alice and receiving terminal Bob；
Connected by fiber channel between transmitting terminal Alice and receiving terminal Bob；It is characterized in that: transmitting terminal Alice includes laser instrument
Laser_Q, laser instrument Laser_S, Polarization Controller PC1, optical circulator Cir1, optical attenuator VOA, wavelength division multiplexer WDM and
Transmitting terminal sagnac ring；Transmitting terminal sagnac ring includes polarization beam apparatus PBS1, phase-modulator PMA, optical rotator
Rotator1 and chronotron Delay1；Polarization beam apparatus PBS1, phase-modulator PMA, optical rotator rotator1 and chronotron
Use polarization maintaining optical fibre to connect between Delay1 successively, between chronotron Delay1 and polarization beam apparatus PBS1, be also adopted by polarization maintaining optical fibre
Connect；Phase-modulator PMA is used for regulating single polarization；Laser instrument Laser_Q and laser instrument Laser_S is used for producing pulsed light,
The pulsed light that laser instrument Laser_Q produces is used for system coding as quantum signal, to generate key；Laser instrument Laser_S produces
Raw pulsed light, as synchronizable optical, synchronizes for system two end signal；Polarization Controller PC1 is for being turned into quantum optical signal
45 ° of line polarized lights also incide in polarization beam apparatus PBS1；Polarization beam apparatus PBS1 is for being divided into level inclined 45 ° of line polarized lights
Shake light and orthogonal polarized light, and horizontal polarization light and orthogonal polarized light are respectively along propagating in polarization maintaining optical fibre clockwise and anticlockwise；
Horizontal polarization light sequentially passes through phase-modulator PMA, chronotron Delay1 and optical rotator rotator1 arrives polarization beam apparatus
PBS1；Orthogonal polarized light sequentially passes through optical rotator rotator1, chronotron Delay1 and phase-modulator PMA arrives polarization point
Bundle device PBS1；Optical rotator rotator1, will for becoming orthogonal polarized light along the horizontal polarization light half-twist propagated clockwise
Polarization half-twist along the orthogonal polarized light propagated counterclockwise becomes horizontal polarization light；Chronotron Delay1 is when time delay waits
Between, the described waiting time is that the required polarized light propagated clockwise and anticlockwise is only modulated clockwise when phase modulation
Or the phase place on counterclockwise, and the waiting time needed in another direction；Phase-modulator PMA is used for modulating clockwise
Or the phase place of the polarized light on counterclockwise,；Horizontal polarization light and orthogonal polarized light after PBS1 converges through optical circulator
Cir1 outgoing, to optical attenuator VOA and by the light intensity of optical attenuator VOA attenuation extremely setting, sends with laser instrument Laser_S afterwards
Light through wavelength division multiplexer WDM multiplexing close road to common signal channel, then by fibre channel transmission arrive receiving terminal Bob；
Receiving terminal Bob includes high light detector Detector, wavelength division multiplexer DWDM, single-photon detector SPD, Polarization Controller
PC2, Polarization Controller PC3, optical circulator Cir2, polarization beam apparatus PBS3 and receiving terminal sagnac ring；Receiving terminal sagnac ring
Including polarization beam apparatus PBS2, phase-modulator PMB, optical rotator rotator2 and chronotron Delay2；
After light pulse is light splitting after being demultiplexed by wavelength division multiplexer DWDM after arriving receiving terminal Bob, synchronizable optical is with quantum light respectively
Along different propagated, synchronizable optical is realized the conversion of photoelectricity for system synchronization by high light detector Detector detection；Amount
Sub-light pulse is entered the sagnac ring of receiving terminal Bob, receiving terminal Bob after Polarization Controller PC2 rectifies a deviation by circulator Cir2
Sagnac ring in the mode of operation of each optics with transmitting terminal Alice, after the sagnac ring of receiving terminal Bob is modulated
Quantum light pulse after Polarization Controller PC3 selects base, then separate that polarization direction is orthogonal through polarization beam apparatus PBS3 two
Group base, then by single-photon detector detection counting.
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 1, it is characterised in that:
Time under double detector pattern, single-photon detector is the single-photon detector SPD1 on two groups of bases and single-photon detector
SPD2。
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 1, it is characterised in that:
Time under simple detector pattern, single-photon detector is single-photon detector SPD3；One group of base is through chronotron Delay3 in succession
To 50:50 beam splitter BS, another set base is directly connected to 50:50 beam splitter BS, two route beam splitter BS and closes road to single-photon detecting
Survey device SPD3 detection counting.
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 3, it is characterised in that:
The delay value of chronotron Delay3 is D, and D=T/2, T are the system cycle.
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 3, it is characterised in that:
The light intensity set is as the light intensity of single photon level.
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 1, it is characterised in that:
The light pulse of the horizontal polarization light propagated clockwise isBy becoming after regulation phase-modulatorReturn polarization beam apparatus PBS1 through polarization maintaining optical fibre to becomeCounterclockwise
The quantum state of the light pulse when orthogonal polarized light propagated returns to polarization beam apparatus PBS1 is
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 6, it is characterised in that:
Arriving Bob end through fibre channel transmission after horizontal polarization light and orthogonal polarized light are by optical attenuator VOA attenuation, level is inclined
Shake light and orthogonal polarized light all adds a common phase factorNow horizontal polarization light and orthogonal polarized light
Light pulse under matrix represents be:
The QKD system of phase-modulated polarized coding based on sagnac ring the most according to claim 7, it is characterised in that light
Pulse matrix after the sagnac ring of Bob end is expressed as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610362025.5A CN105897413B (en) | 2016-05-26 | 2016-05-26 | Sagnac loop-based phase modulation polarization encoded QKD system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610362025.5A CN105897413B (en) | 2016-05-26 | 2016-05-26 | Sagnac loop-based phase modulation polarization encoded QKD system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105897413A true CN105897413A (en) | 2016-08-24 |
| CN105897413B CN105897413B (en) | 2022-10-18 |
Family
ID=56717959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610362025.5A Active CN105897413B (en) | 2016-05-26 | 2016-05-26 | Sagnac loop-based phase modulation polarization encoded QKD system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105897413B (en) |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656494A (en) * | 2017-03-08 | 2017-05-10 | 浙江九州量子信息技术股份有限公司 | Quantum key allocation system and method based on continuous light chopping |
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN106850213A (en) * | 2017-03-08 | 2017-06-13 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method |
| CN107070561A (en) * | 2016-12-19 | 2017-08-18 | 北京大学 | Channel multiplexing device based on two-way plug and play QKD system |
| CN107135071A (en) * | 2017-06-01 | 2017-09-05 | 浙江九州量子信息技术股份有限公司 | One kind is based on time-multiplexed distribution of quantum key system and method |
| CN107241189A (en) * | 2017-07-28 | 2017-10-10 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system not triggered based on vacuum state and method |
| CN107276758A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on Waveguide interference ring |
| CN107276757A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system controlled based on photoswitch and method |
| CN107437966A (en) * | 2017-08-08 | 2017-12-05 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN107979463A (en) * | 2018-01-22 | 2018-05-01 | 中国科学技术大学 | A kind of phase codec and quantum key dispatching system |
| CN108075885A (en) * | 2016-11-15 | 2018-05-25 | 上海朗研光电科技有限公司 | The high speed quantum key distribution system of phase-modulated polarized coding |
| CN108667527A (en) * | 2018-04-11 | 2018-10-16 | 中国人民解放军战略支援部队信息工程大学 | A kind of detection device and method of single-photon detector detection efficient mismatch |
| WO2018196585A1 (en) * | 2017-04-24 | 2018-11-01 | 华为技术有限公司 | Signal receiving apparatus and receiving method |
| CN108923919A (en) * | 2018-07-18 | 2018-11-30 | 安徽问天量子科技股份有限公司 | The control method and control system for selecting base device of the sub- cryptographic system of base unit weight are selected partially |
| CN109257104A (en) * | 2018-08-24 | 2019-01-22 | 中国电子科技集团公司第三十研究所 | A kind of light amplitude modulator approach suitable for CVQKD system |
| CN109327266A (en) * | 2018-08-24 | 2019-02-12 | 中国电子科技集团公司第三十研究所 | A kind of High Extinction Ratio light pulse production method suitable for CVQKD system |
| CN109428649A (en) * | 2017-09-01 | 2019-03-05 | 华为技术有限公司 | Light signal transmission system and optical signal transmission method |
| CN109560876A (en) * | 2017-09-26 | 2019-04-02 | 中国科学技术大学 | Time phase-polarization encoder device, decoding apparatus and quantum communication system |
| CN109946941A (en) * | 2019-04-17 | 2019-06-28 | 上海师范大学 | The optical image encryption system and method for interference based on Sagnac effect |
| CN109962772A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon substrate based on coupled polarization beam splitter integrates quantum key distribution chip structure |
| EP3512154A4 (en) * | 2016-09-27 | 2019-09-25 | Huawei Technologies Co., Ltd. | Encoding apparatus, and quantum key distribution device and system based on same |
| CN110620654A (en) * | 2018-11-02 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Random polarization state transmitting device, receiving device and quantum communication system |
| CN111464302A (en) * | 2020-05-10 | 2020-07-28 | 神盾迅波(北京)量子科技发展有限公司 | Quantum key distribution system based on B92 protocol |
| CN112104452A (en) * | 2019-09-04 | 2020-12-18 | 科大国盾量子技术股份有限公司 | Light splitting assembly, polarization decoding device for quantum key distribution and receiving end |
| CN113504030A (en) * | 2021-07-20 | 2021-10-15 | 安徽问天量子科技股份有限公司 | High-speed pulse laser phase randomization testing device and method |
| CN113810191A (en) * | 2021-10-29 | 2021-12-17 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system, encoder, decoder and method based on circular polarization |
| CN114531226A (en) * | 2021-12-28 | 2022-05-24 | 华南师范大学 | Multi-user sagnac loop QKD system and method based on time division-mode division multiplexing |
| CN114553402A (en) * | 2021-12-31 | 2022-05-27 | 华南师范大学 | Sagnac loop-based reference system-independent measurement device-independent QKD system and method |
| CN116723054A (en) * | 2023-08-08 | 2023-09-08 | 合肥量芯科技有限公司 | Method for resisting detection efficiency mismatch loopholes introduced in calibration process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110280405A1 (en) * | 2010-05-17 | 2011-11-17 | Raytheon Bbn Technologies Corp. | Systems and methods for stabilization of interferometers for quantum key distribution |
| CN103969841A (en) * | 2013-01-30 | 2014-08-06 | 中国科学院空间科学与应用研究中心 | All optical fiber high-speed polarization controlling system and method |
| CN205912068U (en) * | 2016-05-26 | 2017-01-25 | 安徽问天量子科技股份有限公司 | QKD system of phase modulation polarization code based on sagnac ring |
-
2016
- 2016-05-26 CN CN201610362025.5A patent/CN105897413B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110280405A1 (en) * | 2010-05-17 | 2011-11-17 | Raytheon Bbn Technologies Corp. | Systems and methods for stabilization of interferometers for quantum key distribution |
| CN103969841A (en) * | 2013-01-30 | 2014-08-06 | 中国科学院空间科学与应用研究中心 | All optical fiber high-speed polarization controlling system and method |
| CN205912068U (en) * | 2016-05-26 | 2017-01-25 | 安徽问天量子科技股份有限公司 | QKD system of phase modulation polarization code based on sagnac ring |
Non-Patent Citations (2)
| Title |
|---|
| 李申等: "全光纤量子通信***中的高速偏振控制方案", 《物理学报》 * |
| 马海强等: "基于双偏振分束器的量子密钥分发***", 《物理学报》 * |
Cited By (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11327233B2 (en) | 2016-09-27 | 2022-05-10 | Huawei Technologies Co., Ltd. | Encoding apparatus using same polarization modes, and quantum key distribution device and system based on same |
| EP3512154A4 (en) * | 2016-09-27 | 2019-09-25 | Huawei Technologies Co., Ltd. | Encoding apparatus, and quantum key distribution device and system based on same |
| CN108075885A (en) * | 2016-11-15 | 2018-05-25 | 上海朗研光电科技有限公司 | The high speed quantum key distribution system of phase-modulated polarized coding |
| CN107070561A (en) * | 2016-12-19 | 2017-08-18 | 北京大学 | Channel multiplexing device based on two-way plug and play QKD system |
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN106850213A (en) * | 2017-03-08 | 2017-06-13 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method |
| CN106656494A (en) * | 2017-03-08 | 2017-05-10 | 浙江九州量子信息技术股份有限公司 | Quantum key allocation system and method based on continuous light chopping |
| CN106789048B (en) * | 2017-03-08 | 2023-08-18 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on two-way single photon detection |
| CN106656494B (en) * | 2017-03-08 | 2023-08-18 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on continuous photointerruption |
| CN106850213B (en) * | 2017-03-08 | 2023-08-25 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method |
| WO2018196585A1 (en) * | 2017-04-24 | 2018-11-01 | 华为技术有限公司 | Signal receiving apparatus and receiving method |
| US10749608B2 (en) | 2017-04-24 | 2020-08-18 | Huawei Technologies Co., Ltd. | Signal receiving apparatus and method |
| CN107135071A (en) * | 2017-06-01 | 2017-09-05 | 浙江九州量子信息技术股份有限公司 | One kind is based on time-multiplexed distribution of quantum key system and method |
| CN107135071B (en) * | 2017-06-01 | 2023-08-18 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on time division multiplexing |
| CN107276757A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system controlled based on photoswitch and method |
| CN107241189A (en) * | 2017-07-28 | 2017-10-10 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system not triggered based on vacuum state and method |
| CN107276758A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on Waveguide interference ring |
| CN107241189B (en) * | 2017-07-28 | 2023-08-25 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on vacuum state non-triggering |
| CN107437966B (en) * | 2017-08-08 | 2019-08-09 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN107437966A (en) * | 2017-08-08 | 2017-12-05 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN109428649A (en) * | 2017-09-01 | 2019-03-05 | 华为技术有限公司 | Light signal transmission system and optical signal transmission method |
| US11082131B2 (en) | 2017-09-01 | 2021-08-03 | Huawei Technologies Co., Ltd. | Optical signal transmission system and optical signal transmission method |
| CN109560876A (en) * | 2017-09-26 | 2019-04-02 | 中国科学技术大学 | Time phase-polarization encoder device, decoding apparatus and quantum communication system |
| CN109560876B (en) * | 2017-09-26 | 2020-05-15 | 中国科学技术大学 | Time phase-polarization encoding device, decoding device, and quantum communication system |
| CN109962772A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon substrate based on coupled polarization beam splitter integrates quantum key distribution chip structure |
| CN109962772B (en) * | 2017-12-14 | 2024-04-16 | 科大国盾量子技术股份有限公司 | Silicon-based integrated quantum key distribution chip based on coupling polarization beam splitter |
| CN107979463B (en) * | 2018-01-22 | 2020-06-26 | 中国科学技术大学 | Phase encoder-decoder and quantum key distribution system |
| CN107979463A (en) * | 2018-01-22 | 2018-05-01 | 中国科学技术大学 | A kind of phase codec and quantum key dispatching system |
| CN108667527A (en) * | 2018-04-11 | 2018-10-16 | 中国人民解放军战略支援部队信息工程大学 | A kind of detection device and method of single-photon detector detection efficient mismatch |
| CN108923919A (en) * | 2018-07-18 | 2018-11-30 | 安徽问天量子科技股份有限公司 | The control method and control system for selecting base device of the sub- cryptographic system of base unit weight are selected partially |
| CN108923919B (en) * | 2018-07-18 | 2020-12-08 | 安徽问天量子科技股份有限公司 | Control method and control system for base selection device of base-biased quantum cryptography system |
| CN109257104A (en) * | 2018-08-24 | 2019-01-22 | 中国电子科技集团公司第三十研究所 | A kind of light amplitude modulator approach suitable for CVQKD system |
| CN109327266A (en) * | 2018-08-24 | 2019-02-12 | 中国电子科技集团公司第三十研究所 | A kind of High Extinction Ratio light pulse production method suitable for CVQKD system |
| CN110620654B (en) * | 2018-11-02 | 2022-09-16 | 科大国盾量子技术股份有限公司 | Random polarization state transmitting device, receiving device and quantum communication system |
| CN110620654A (en) * | 2018-11-02 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Random polarization state transmitting device, receiving device and quantum communication system |
| CN109946941A (en) * | 2019-04-17 | 2019-06-28 | 上海师范大学 | The optical image encryption system and method for interference based on Sagnac effect |
| CN112104452B (en) * | 2019-09-04 | 2022-05-03 | 科大国盾量子技术股份有限公司 | Light splitting assembly, polarization decoding device for quantum key distribution and receiving end |
| CN112104452A (en) * | 2019-09-04 | 2020-12-18 | 科大国盾量子技术股份有限公司 | Light splitting assembly, polarization decoding device for quantum key distribution and receiving end |
| CN111464302A (en) * | 2020-05-10 | 2020-07-28 | 神盾迅波(北京)量子科技发展有限公司 | Quantum key distribution system based on B92 protocol |
| CN113504030A (en) * | 2021-07-20 | 2021-10-15 | 安徽问天量子科技股份有限公司 | High-speed pulse laser phase randomization testing device and method |
| CN113504030B (en) * | 2021-07-20 | 2024-03-12 | 安徽问天量子科技股份有限公司 | Phase randomization testing device and method for high-speed pulse laser |
| CN113810191A (en) * | 2021-10-29 | 2021-12-17 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system, encoder, decoder and method based on circular polarization |
| CN113810191B (en) * | 2021-10-29 | 2023-10-27 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system, encoder, decoder and method based on circularly polarized light |
| CN114531226B (en) * | 2021-12-28 | 2023-06-30 | 华南师范大学 | Multi-user sagnac ring QKD system and method based on time division-mode division multiplexing |
| CN114531226A (en) * | 2021-12-28 | 2022-05-24 | 华南师范大学 | Multi-user sagnac loop QKD system and method based on time division-mode division multiplexing |
| CN114553402B (en) * | 2021-12-31 | 2023-06-30 | 华南师范大学 | QKD system and method based on sagnac loop and irrelevant to reference system irrelevant measurement equipment |
| CN114553402A (en) * | 2021-12-31 | 2022-05-27 | 华南师范大学 | Sagnac loop-based reference system-independent measurement device-independent QKD system and method |
| CN116723054A (en) * | 2023-08-08 | 2023-09-08 | 合肥量芯科技有限公司 | Method for resisting detection efficiency mismatch loopholes introduced in calibration process |
| CN116723054B (en) * | 2023-08-08 | 2023-10-27 | 合肥量芯科技有限公司 | Method for resisting detection efficiency mismatch loopholes introduced in calibration process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105897413B (en) | 2022-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105897413A (en) | Phase modulation polarization coded QKD system based on sagnac ring | |
| CN106685655B (en) | A kind of phase polarization multiple degrees of freedom modulation QKD network system and method | |
| Zhang et al. | Continuous-variable QKD over 50 km commercial fiber | |
| Sasaki et al. | Field test of quantum key distribution in the Tokyo QKD Network | |
| CN106161010A (en) | The high one-tenth point-to-point QKD system of code check and transmitting terminal, receiving terminal and QKD method | |
| JP5492255B2 (en) | Quantum communication system | |
| Sun et al. | Entanglement swapping over 100 km optical fiber with independent entangled photon-pair sources | |
| JP4528783B2 (en) | Dynamic stabilization of unidirectional QKD system | |
| Kravtsov et al. | Physical layer secret key generation for fiber-optical networks | |
| CN108650091A (en) | Phase decoding method, phase decoding reception device and quantum key distribution system | |
| CN109450628A (en) | A kind of unrelated quantum key distribution network system of plug and play measuring device and method | |
| KR20160022069A (en) | Method and apparatus for quantum cryptographic communication | |
| CN205912068U (en) | QKD system of phase modulation polarization code based on sagnac ring | |
| US11979195B2 (en) | System and method for scheduling and distributing quantum entangled particles | |
| CN208369599U (en) | Phase decoding reception device and quantum key distribution system | |
| CN107070561A (en) | Channel multiplexing device based on two-way plug and play QKD system | |
| CN206379954U (en) | Channel multiplexing device based on two-way plug and play QKD system | |
| CN208285324U (en) | A kind of changeable polymorphic type quantum Terminal communication system | |
| CN206596004U (en) | A kind of phase polarization multiple degrees of freedom modulation QKD network systems | |
| CN205986907U (en) | High one -tenth point -to -point QKD system of code check and transmitting terminal, receiving terminal | |
| CN208433978U (en) | Polarization feedback compensating system based on mode division multiplexing in a kind of quantum secret communication | |
| Scalcon et al. | Cross‐Encoded Quantum Key Distribution Exploiting Time‐Bin and Polarization States with Qubit‐Based Synchronization | |
| Aguado et al. | First Experimental demonstration of secure NFV orchestration over an SDN-controlled optical network with time-shared quantum key distribution | |
| CN209517161U (en) | A kind of coalescing network system of quantum communications and the transmission of quantum time-frequency | |
| Sharma et al. | Transmission and control for QKD in online banking systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |