CN115065418A - Pulsed light signal detection method for QKD system and receiving end - Google Patents

Pulsed light signal detection method for QKD system and receiving end Download PDF

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CN115065418A
CN115065418A CN202210881508.1A CN202210881508A CN115065418A CN 115065418 A CN115065418 A CN 115065418A CN 202210881508 A CN202210881508 A CN 202210881508A CN 115065418 A CN115065418 A CN 115065418A
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photon detector
detection
pulsed light
phase difference
pulse light
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CN115065418B (en
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王林松
王其兵
陈柳平
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Guokaike Quantum Technology Beijing Co Ltd
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Guokaike Quantum Technology Beijing Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/70—Photonic quantum communication
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a pulse light signal detection method and a receiving end for a QKD system, and relates to the field of quantum communication, wherein phase differences among 2 interfered pulse light signals output by 2 arms of an optical fiber interferometer are adjusted in a circulating mode, and based on the phase differences among the 2 pulse light signals, the 2 pulse light signals are detected in a time-sharing mode by a first single-photon detector and a second single-photon detector respectively, so that the balance of 0 and 1 in the detected pulse light signal coding information can be optimized on the basis of ensuring the code rate, and the safety of a quantum communication system is improved.

Description

Pulsed light signal detection method for QKD system and receiving end
Technical Field
The invention relates to the field of quantum communication, in particular to a pulsed light signal detection method and a receiving end for a QKD system.
Background
Time-phase encoding is the mainstream encoding scheme for Quantum Key Distribution (QKD) systems. At present, a receiving end of a QKD system based on time phase encoding generally uses a single or multiple single-photon detectors to detect optical signals and restore the optical signals into pulsed optical signals for subsequent decoding. But when a single-photon detector is used, the code rate is low, and the design requirement on the detector is high. When a plurality of single-photon detectors are used, due to the limitation of the performance of the single-photon detectors, each single-photon detector can only detect a certain single pulse light signal (a front pulse light signal or a rear pulse light signal), and the scheme has the following defects: the condition that 0 and 1 in the coded information of the detected pulse optical signal are unbalanced (0 or 1 accounts for more) is easy to generate, the randomness of the quantum key is reduced, and the safety of the quantum communication system is low.
Disclosure of Invention
The embodiment of the invention provides a pulsed light signal detection method and a receiving end for a QKD system, which are used for solving the defect of low safety of a quantum communication system caused by unbalanced 0 and 1 in the coded information of the pulsed light signal obtained by detection in the prior art.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a pulsed light signal detection method for a QKD system, including the following steps:
and circularly adjusting the phase difference between the interfered 2 pulse light signals output by the 2 arms of the fiber interferometer.
And respectively carrying out time-sharing detection on the 2 pulse optical signals by utilizing a first single-photon detector and a second single-photon detector based on the phase difference between the 2 pulse optical signals.
As a preferred embodiment of the first aspect, the circularly adjusting the phase difference between the interfered 2 pulsed light signals output by the fiber interferometer 2 arm includes:
and circularly adjusting the voltage at two ends of a phase shifter connected to one arm of the fiber optic interferometer according to a preset frequency, so that the phase difference between the 2 pulse optical signals is switched in a cross mode between 0 and pi.
As a preferred embodiment of the first aspect, the time-division detecting, by using a first single-photon detector and a second single-photon detector, the 2 pulsed light signals based on the phase difference between the 2 pulsed light signals includes:
when the phase difference between the 2 pulse light signals is 0, inputting the pulse light signal of which the code information is 0 after interference into a first single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a second single-photon detector for detection.
As a preferred embodiment of the first aspect, the time-sharing detection of the 2 pulsed light signals by the first single-photon detector and the second single-photon detector based on the phase difference between the 2 pulsed light signals further includes:
when the phase difference between the 2 pulse light signals is pi, inputting the pulse light signal of which the code information is 0 after interference into a second single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a first single-photon detector for detection.
In a second aspect, a receiving end for a QKD system according to an embodiment of the present invention includes:
a fiber optic interferometer.
And the light source is used for preparing pulsed light and inputting the pulsed light into the fiber interferometer.
And the first phase shifter is optically connected with one arm of the optical fiber interferometer and is used for calibrating the phase difference between the 2 pulse light signals output after the interference of the optical fiber interferometer, so that the phase difference between the 2 pulse light signals is maintained at a fixed value in a set time period.
And the second phase shifter is optically connected with the other arm of the fiber interferometer and is used for circularly adjusting the phase difference between the 2 pulse optical signals based on a control signal sent by the controller, so that the phase difference is switched in a cross mode between 0 and pi.
And the first single-photon detector is used for carrying out time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller.
And the second single-photon detector is used for carrying out time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller.
A controller for executing the pulsed light signal detection method for the QKD system according to the first aspect.
In a preferred embodiment of the second aspect, the optical fiber interferometer is configured to input a pulsed light signal with encoded information after interference of 0 into the first single-photon detector for detection, and input a pulsed light signal with encoded information after interference of 1 into the second single-photon detector for detection, according to the control signal sent by the controller.
In a preferred embodiment of the second aspect, the optical fiber interferometer is configured to input a pulsed light signal with encoded information after interference of 0 to the second single-photon detector for detection, and input a pulsed light signal with encoded information after interference of 1 to the first single-photon detector for detection, according to the control signal sent by the controller.
In a preferred embodiment of the second aspect, the fiber interferometer is a michelson interferometer.
In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, where the storage medium stores a computer program, and the computer program is configured to execute the method in the first aspect.
In a fourth aspect, an embodiment of the present invention provides an electronic device, where the electronic device includes:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to the first aspect.
The pulse light signal detection method and the receiving end for the QKD system provided by the embodiment of the invention have the following beneficial effects:
through the phase difference between the 2 interfered pulse light signals after the cyclic adjustment, each single photon detector can detect the pulse light signals of which the coded information is 0 and 1, the balance of 0 and 1 in the detected pulse light signal coded information can be optimized on the basis of ensuring the code rate, and the safety of a quantum communication system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a pulsed light signal detection method for a QKD system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a switching process of phase differences between 2 pulsed light signals output after interference by an optical fiber interferometer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a receiving end portion of a QKD system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1, the pulsed light signal detection method for a QKD system according to the embodiment of the present invention includes the following steps:
and S101, circularly adjusting the phase difference between the interfered 2 pulse light signals output by the 2 arms of the fiber interferometer.
In a possible implementation manner, step S101 specifically includes:
and circularly adjusting the voltage at two ends of a phase shifter connected to one arm of the fiber optic interferometer according to a preset frequency, so that the phase difference between the 2 pulse optical signals is switched in a cross mode between 0 and pi.
Specifically, for the case that 0 and 1 in the pulse light signals detected under the X-base vector or the Y-base vector are not balanced (0 or 1 is more), since the pulse light signals under the X-base vector or the Y-base vector can be switched to another detection channel, the phase difference between the pulse light signals can be adjusted to optimize the balance between 0 and 1 in the detected pulse light signals.
Specifically, since the number of single photons detected by the single photon detector in 1ms is generally only several tens, the preset frequency may be 1s, that is, the phase difference between 2 pulsed light signals can be switched once in 1s normally in both 0 and pi, and no influence is generated. The switching process of the phase difference between the 2 pulsed light signals is shown in fig. 2. In fig. 2, X0 is a pulsed light signal whose coded information is 0, and X1 is a pulsed light signal whose coded information is 1.
And S102, respectively carrying out time-sharing detection on the 2 pulse light signals by utilizing the first single-photon detector and the second single-photon detector based on the phase difference among the 2 pulse light signals.
In a possible implementation manner, step S102 specifically includes:
when the phase difference between the 2 pulse light signals is 0, inputting the pulse light signal of which the code information is 0 after interference into a first single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a second single-photon detector for detection.
Specifically, when the phase difference between 2 pulsed light signals is 0, all the pulsed light signals with the coded information of 0 enter the first single-photon detector, and all the pulsed light signals with the coded information of 1 enter the second single-photon detector.
In a possible implementation manner, step S102 specifically further includes:
when the phase difference between the 2 pulse light signals is pi, inputting the pulse light signal of which the code information is 0 after interference into a second single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a first single-photon detector for detection.
Specifically, when the phase difference between 2 pulsed light signals is pi, all the pulsed light signals with the coded information of 0 enter the second single-photon detector, and all the pulsed light signals with the coded information of 1 enter the first single-photon detector.
Particularly, through the steps, the first single-photon detector and the second single-photon detector can detect the pulse light signals with the coded information of 0 and 1 in a time-sharing mode, and even if the detection efficiencies of the first single-photon detector and the second single-photon detector are inconsistent, the balance of the pulse light signals with the coded information of 0 and 1 detected by the first single-photon detector and the second single-photon detector can be optimized after a certain time.
Example 2
As shown in fig. 3, the receiving end for the QKD system according to an embodiment of the present invention includes a light source, a circulator, a first phase shifter, a second phase shifter, a first power source, a second power source, a first single-photon detector, a second single-photon detector, a beam splitter, a first mirror, a second mirror, and a controller, where:
the beam splitter, the first reflector and the second reflector form an optical fiber interferometer.
And the light source is used for preparing pulsed light and inputting the pulsed light into the fiber interferometer.
Specifically, the pulsed light is input to the fiber optic interferometer through a circulator.
And the first phase shifter is optically connected with one arm of the optical fiber interferometer and is used for calibrating the phase difference between the 2 pulse light signals output after the interference of the optical fiber interferometer, so that the phase difference between the 2 pulse light signals is maintained at a fixed value in a set time period.
And the first power supply is used for supplying power to the first phase shifter.
Specifically, the first phase shifter functions to stabilize the phase between the pulsed light signals.
And the second phase shifter is optically connected with the other arm of the fiber interferometer and is used for circularly adjusting the phase difference between the 2 pulse optical signals based on a control signal sent by the controller, so that the phase difference is switched in a cross mode between 0 and pi.
And the second power supply is used for supplying power to the second phase shifter. Specifically, the second power supply cyclically changes its own output voltage according to a control signal sent by the controller, so that the second phase shifter can cyclically adjust the phase difference between 2 pulse light signals, so that the phase difference is cross-switched between 0 and pi.
In particular, the voltage value V can be factory calibrated 1 And V 2 And circularly adjusting the voltage applied to the two ends of the pulse light signals, so that the phase difference between the 2 pulse light signals is switched in a cross mode between 0 and pi.
And the first single-photon detector is used for carrying out time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller.
And the second single-photon detector is used for carrying out time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller.
The controller is used to execute the pulsed light signal detection method for the QKD system described in embodiment 1 above.
In a possible implementation manner, the optical fiber interferometer is configured to input a pulse light signal with coding information after interference of 0 into the first single-photon detector for detection, and input a pulse light signal with coding information after interference of 1 into the second single-photon detector for detection, according to a control signal sent by the controller.
In a possible implementation manner, the optical fiber interferometer is configured to input a pulsed light signal with encoded information after interference being 0 to the second single-photon detector for detection, and input a pulsed light signal with encoded information after interference being 1 to the first single-photon detector for detection, according to a control signal sent by the controller.
Specifically, a pulse light signal with the coded information of 0 or 1 is input into the second single-photon detector through the circulator.
In one possible implementation, the fiber optic interferometer is a michelson interferometer.
Particularly, the pulsed light signal detection method and the receiving end for the QKD system provided by the embodiment of the invention are not only applicable to quantum communication systems, but also applicable to other communication systems.
Example 3
Fig. 4 is a structure of an electronic device according to an exemplary embodiment of the present invention. As shown in fig. 4, the electronic device may be either or both of the first device and the second device, or a stand-alone device separate from them, which stand-alone device may communicate with the first device and the second device to receive the collected input signals therefrom. FIG. 4 illustrates a block diagram of an electronic device in accordance with a disclosed embodiment of the invention. As shown in fig. 4, the electronic device includes one or more processors 401 and memory 402.
The processor 401 may be a Central Processing Unit (CPU) or other form of processing unit having pervasive data processing capability and/or instruction execution capability and may control other components in an electronic device to perform desired functions.
Memory 402 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium and executed by the processor 401 to implement the method of information mining of historical change records of the software program of the disclosed embodiments described above and/or other desired functions. In one example, the electronic device may further include: an input device 403 and an output device 404, which are interconnected by a bus system and/or other form of connection mechanism (not shown).
The input device 403 may also include, for example, a keyboard, a mouse, and the like.
The output device 404 can output various information to the outside. The output devices 404 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for simplicity, only some of the components of the electronic device relevant to the present disclosure are shown in fig. 4, omitting components such as buses, input/output interfaces, and the like. In addition, the electronic device may include any other suitable components, depending on the particular application.
Example 4
In addition to the above-described methods and apparatus, embodiments of the present disclosure may also be a computer program product comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods of infiltration data annotation, encapsulation, and retrieval according to various embodiments of the present disclosure described in the "exemplary methods" section of this specification above.
The computer program product may write program code for performing the operations of the disclosed embodiments of the present invention in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present disclosure may also be a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods of infiltration data annotation, encapsulation, and retrieval according to various embodiments of the present disclosure described in the "exemplary methods" section above of this specification.
The computer-readable storage medium may utilize any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the invention is not disclosed in any way as necessarily requiring implementation of such specific details.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The block diagrams of devices, apparatuses, systems involved in the disclosure of the present invention are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. As used herein, the words "or" and "refer to, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
The disclosed methods and apparatus may be implemented in a number of ways. For example, the methods and apparatus disclosed herein may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method disclosed herein are not limited to the order specifically described above unless specifically indicated otherwise. Further, in some embodiments, the present disclosure may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
It is also noted that in the devices, apparatus and methods disclosed herein, each element or step can be broken down and/or re-combined. Such decomposition and/or recombination should be considered equivalents of the present disclosure. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit the disclosed embodiments to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, adaptations, additions, and sub-combinations thereof.
It will be appreciated that the relevant features of the method and apparatus described above are referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A pulsed light signal detection method for a QKD system, comprising the steps of:
circularly adjusting the phase difference between the interfered 2 pulse light signals output by the 2 arms of the fiber interferometer;
and respectively carrying out time-sharing detection on the 2 pulse optical signals by utilizing a first single-photon detector and a second single-photon detector based on the phase difference between the 2 pulse optical signals.
2. The pulsed light signal detection method for a QKD system according to claim 1, wherein circularly adjusting the phase difference between the 2 interfered pulsed light signals output through the 2 arms of the fiber interferometer comprises:
and circularly adjusting the voltage at two ends of a phase shifter connected to one arm of the fiber optic interferometer according to a preset frequency, so that the phase difference between the 2 pulse optical signals is switched in a cross mode between 0 and pi.
3. The method of claim 1, wherein the time-sharing detection of the 2 pulsed light signals by the first single-photon detector and the second single-photon detector based on the phase difference between the 2 pulsed light signals comprises:
when the phase difference between the 2 pulse light signals is 0, inputting the pulse light signal of which the code information is 0 after interference into a first single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a second single-photon detector for detection.
4. The method of claim 2, wherein the time-sharing detection of the 2 pulsed light signals by the first and second single-photon detectors based on the phase difference between the 2 pulsed light signals further comprises:
when the phase difference between the 2 pulse light signals is pi, inputting the pulse light signal of which the code information is 0 after interference into a second single-photon detector for detection, and inputting the pulse light signal of which the code information is 1 after interference into a first single-photon detector for detection.
5. A receiving end for a QKD system, comprising:
an optical fiber interferometer;
the light source is used for preparing pulsed light and inputting the pulsed light into the fiber interferometer;
a first phase shifter optically connected to one arm of the fiber interferometer, for calibrating a phase difference between 2 pulsed light signals output after being interfered by the fiber interferometer, so that the phase difference between the 2 pulsed light signals is maintained at a fixed value within a set time period;
the second phase shifter is optically connected with the other arm of the fiber interferometer and is used for circularly adjusting the phase difference between the 2 pulse optical signals based on a control signal sent by the controller, so that the phase difference is switched in a cross mode between 0 and pi;
the first single-photon detector is used for carrying out time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller;
the second single-photon detector is used for performing time-sharing detection on the 2 interfered pulse light signals based on the control signal sent by the controller;
a controller for performing the pulsed light signal detection method for a QKD system according to any of claims 1-4 above.
6. The receiving end for a QKD system according to claim 5, wherein:
the optical fiber interferometer is used for inputting the pulse light signal of which the code information is 0 after interference into the first single-photon detector for detection and inputting the pulse light signal of which the code information is 1 after interference into the second single-photon detector for detection according to the control signal sent by the controller.
7. The receiving end for a QKD system according to claim 6, wherein:
the optical fiber interferometer is used for inputting the pulse light signal of which the code information is 0 after interference into the second single-photon detector for detection and inputting the pulse light signal of which the code information is 1 after interference into the first single-photon detector for detection according to the control signal sent by the controller.
8. The receiving end for a QKD system according to any of claims 5-7, wherein:
the optical fiber interferometer is a Michelson interferometer.
9. A computer-readable storage medium, characterized in that the storage medium stores a computer program for executing the pulsed light signal detection method according to any one of claims 1 to 4.
10. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory for storing the processor-executable instructions;
the processor is used for reading the executable instructions from the memory and executing the instructions to realize the pulsed light signal detection method of any one of the above claims 1 to 4.
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CN113595630A (en) * 2021-08-09 2021-11-02 国开启科量子技术(北京)有限公司 Two-arm insertion loss calibration device and system for unequal-arm interferometer

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CN113259015A (en) * 2021-07-05 2021-08-13 国开启科量子技术(北京)有限公司 Transmitting end and receiving end of quantum communication system for time phase coding
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