JPS61182282A - Magnetic flux trap preventive type josephson device - Google Patents
Magnetic flux trap preventive type josephson deviceInfo
- Publication number
- JPS61182282A JPS61182282A JP60021923A JP2192385A JPS61182282A JP S61182282 A JPS61182282 A JP S61182282A JP 60021923 A JP60021923 A JP 60021923A JP 2192385 A JP2192385 A JP 2192385A JP S61182282 A JPS61182282 A JP S61182282A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- circuit
- josephson
- magnetic flux
- superconductors
- 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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/10—Junction-based devices
- H10N60/12—Josephson-effect devices
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はジョセフソン接合とインダクタンス。[Detailed description of the invention] (Industrial application field) The present invention is a Josephson junction and an inductance.
もしくはジョセフソン素子と抵抗とから構成されるジョ
セフソン論理回路装置やジョセフソン記憶回路装置に関
するものである。Alternatively, the present invention relates to a Josephson logic circuit device or a Josephson memory circuit device composed of a Josephson element and a resistor.
（従来技術とその問題点）
ジョセフソン接合は外から加わる磁束に対する感度が高
く、磁束量子（２，０７ｘ１０−’ガウス）程度の磁束
の影響を受けて臨界電流値が大きく変化する。通常、ジ
ョセフソン接合と抵抗もしくはインダクタンスとから構
成されるジョセフソン回路は。(Prior art and its problems) Josephson junctions are highly sensitive to magnetic flux applied from the outside, and the critical current value changes greatly under the influence of magnetic flux of about a magnetic flux quantum (2,07 x 10 -' Gauss). A Josephson circuit usually consists of a Josephson junction and a resistance or inductance.
臨界電流値の制御によシジョセフソン接合を電圧状態に
スイッチさせて論理を行なう。よって、臨界電流値が外
部磁界によって変化するとジョセフソン回路が誤動作す
る。回路の正常動作を得るたメニ、インフォメイション
・ディスプレイ（Ｉｎ−ｆｏｒｍａｔｉｏｎ ｄｉｓｐ
ｌａｙ ）の昭和５８年４月号に記載されているような
３重、４重の磁気シールド内にジョセフソン回路を挿入
して動作させる必要がある。しかしながら、４重の磁気
シールドを設けても、漏れ磁束を完全に除くことができ
ない。このため、ジョセフソン回路を液体ヘリウム温度
に冷却する時１回路下に配置されている通常ニオブ膜で
形成された接地面に磁束量子が磁束（トラップと称する
）される０ジ讐セフソン接合やスクイラド（ＳＱＵＩＤ
）の近辺゛に磁束量子がトラップされると、トラップさ
れた磁束が作る磁界に影響され、接合の臨界電流値やス
クイラドの閾値特性が変化する。バーモン（Ｂｅｒｍｏ
ｎ ）等は、回路の機能パターンが力い領域に強制的に
磁束量子をトラップさせ１回路の機能パターン中への磁
束トラップを減するモー） （ｍｏａｔ）構造を提案し
た（アイ・イー・イー・トランザクシ璽ンズ・オン・マ
グネティクス（ＩＥＥＢ ｔｒａｎｓａｃｔｉｏｎｓ
ｏｎ ｍａｇｎｅｔｉｃｓ）第ＭＡＧ＝１９巻、第３
号、第１１６０頁）。モート構造は、機能回路部分の周
りの接地面に穴をあけた構造である。モートによシスク
イツト回路は、１ミリガウスの磁界中においても正常に
動作した。Logic is performed by switching the Josephson junction into a voltage state by controlling the critical current value. Therefore, if the critical current value changes due to an external magnetic field, the Josephson circuit will malfunction. Menu and information display (In-formation display) to ensure normal operation of the circuit.
In order to operate the Josephson circuit, it is necessary to insert it into a triple or quadruple magnetic shield as described in the April 1988 issue of J. Lay. However, even if a four-fold magnetic shield is provided, leakage magnetic flux cannot be completely eliminated. For this reason, when a Josephson circuit is cooled to liquid helium temperature, magnetic flux quanta are trapped (called a trap) on the ground plane, which is usually formed of a niobium film, placed below the circuit. (SQUID
) When magnetic flux quanta are trapped in the vicinity of ), the critical current value of the junction and the threshold characteristics of the squirad change due to the influence of the magnetic field created by the trapped magnetic flux. Bermo
proposed a moat structure that forcibly traps magnetic flux quanta in regions where the circuit's functional pattern is strong and reduces magnetic flux trapping in the functional pattern of one circuit.・Transactions on Magnetics (IEEE transactions)
on magnetics) Volume 19, Volume 3
No. 1160). The mote structure has holes in the ground plane around the functional circuitry. The mote system operated normally even in a 1 milliGauss magnetic field.
しかしながら、モートは接地面に穴を設けるため、接地
面の連続性が失なわれる。一方、ジョセフソン回路を数
ピコ秒で動作させるためには、完全な接地面により、接
地面上に回路電流のイメージ電流を発生させ、電磁界を
回路と接地面間に閉じ込める必要がある。従って、接地
面に不連続部があると、不連続部で電磁界の乱れが生じ
、伝送信号の反射、隣接線へのクロストークが増大する
。However, since motes provide holes in the ground plane, the continuity of the ground plane is lost. On the other hand, in order to operate a Josephson circuit in a few picoseconds, it is necessary to generate an image current of the circuit current on the ground plane using a perfect ground plane, and to confine the electromagnetic field between the circuit and the ground plane. Therefore, if there is a discontinuity in the ground plane, electromagnetic field disturbance occurs at the discontinuity, which increases reflection of transmission signals and crosstalk to adjacent lines.
伝送信号の反射、クロストークは１回路中の他の機能素
子に雑音として作用し１回路の動作マージンを低下させ
る。即ち、モート構造においては、モート部で雑音が生
じ、動作マージンを低下させ、回路を誤動作させていた
。Reflection of the transmitted signal and crosstalk act as noise on other functional elements in one circuit, reducing the operating margin of one circuit. That is, in the moat structure, noise is generated in the moat section, lowering the operating margin and causing the circuit to malfunction.
（発明の目的）
本発明の目的は１上記したジョセフソン回路装置の欠点
を除き、漏れ磁束の大きい磁場環境においても広い動作
マージンを持つ回路装置を提供することにある。(Objective of the Invention) An object of the present invention is to provide a circuit device which eliminates the above-described drawbacks of the Josephson circuit device and has a wide operating margin even in a magnetic field environment with large leakage flux.
（発明の構成） 本発明は、少くとも超伝導体から成る接地面と。(Structure of the invention) The present invention provides a ground plane made of at least a superconductor.
前記接地面上に絶縁体を介して形成された互いに絶縁さ
れた第１の超伝導体と第２の超伝導体と。A first superconductor and a second superconductor that are insulated from each other and are formed on the ground plane with an insulator interposed therebetween.
前記第１及び第２の超伝導体の一部に形成されたジョセ
フソン接合とを含むジョセフソン回路において、前記接
地面と第１及び第２の超伝導体のいずれよりも高い超伝
導体臨界温度を持つ第３の超伝導体を前記ジョセフソン
装置中に多数個備えたことを特徴とする磁束トラップ防
止型ジョセフソン装置である。a Josephson circuit including a Josephson junction formed in a portion of the first and second superconductors, the ground plane and a superconductor criticality higher than either of the first and second superconductors; This is a magnetic flux trap prevention type Josephson device characterized in that a large number of third superconductors having temperature are provided in the Josephson device.
（構成の詳細な説明）
第１図は、本発明の詳細な説明するための磁束トラップ
防止型ジョセフソン装置の概略図である。(Detailed Description of Configuration) FIG. 1 is a schematic diagram of a magnetic flux trap prevention type Josephson device for explaining the present invention in detail.
同図（ａＪは１本発明の装置をチップ上から見た回路パ
ターンのブロック図、同図（ｂ）〜（ｆ）は、同図（ａ
）のＡＢ面の断面の概略を示した図である。The same figure (aJ is a block diagram of the circuit pattern of the device of the present invention viewed from the top of the chip, and the same figure (b) to (f) are the same figure (a)
) is a diagram schematically showing a cross section of the AB plane.
本発明の装置は、接地面１０１上に、少くとも第１の超
伝導体と第２の超伝導体とジョセフソン接合から構成さ
れるジョセフソン回路の機能部１０２と、第３の超伝導
体１０３が以下のように配置される。ここで、ジョセフ
ソン回路の機能部１０２には。The device of the present invention includes, on a ground plane 101, a functional part 102 of a Josephson circuit composed of at least a first superconductor, a second superconductor, and a Josephson junction, and a third superconductor. 103 are arranged as follows. Here, in the functional section 102 of the Josephson circuit.
信号入力線１２１と信号出力線１２２とが必要によ〕多
数本接続される０
第３の超伝導体１０３は、第１図（ａ）に示す平面的な
配置として、ジョセフソン回路の機′能部１０２を包む
ように、機能部１０２よシ大きい領域に配置される。ジ
ョセフソン回路の機能部１０２に対する第３の超伝導体
の立体的配置は、第１図（ｂ）〜（ｅ）に取られる。第
３の超伝導体１０４〜１１０は１図（ｂ）のように接地
面１０１と機能部１０２０間１図（Ｃ）のように機能部
１０２の上部１図（ｄ）に示すように機能部１０２の上
部と下部１図（ｅ）に示すように、ジョセフソン回路が
塔載されている基板１１１の裏側即ち１機能部１０２が
配置されてい々い側、図げ）に示すように基板１１１の
裏側と機能部１０２の上部にそれぞれ設けられる。図（
ｅ）（ｆ）の実施例において、第３の超伝導体１０８〜
１１０の平面寸法は、基板１１１（通常シリコン基板が
使用される）の厚さより十分大きくとられる。A large number of signal input lines 121 and signal output lines 122 are connected as necessary. The third superconductor 103 is arranged in a plane as shown in FIG. It is arranged in an area larger than the functional section 102 so as to surround the functional section 102 . The three-dimensional arrangement of the third superconductor with respect to the functional part 102 of the Josephson circuit is shown in FIGS. 1(b) to 1(e). The third superconductors 104 to 110 are arranged between the ground plane 101 and the functional section 1020 as shown in FIG. 1(b) and above the functional section 102 as shown in FIG. 1(C). The upper and lower parts of the board 102 are shown in FIG. and on the upper side of the functional section 102, respectively. figure(
e) In the embodiment of (f), the third superconductor 108~
The planar dimensions of 110 are set to be sufficiently larger than the thickness of substrate 111 (usually a silicon substrate).
以上第３の超伝導体１０４〜１１０は、第３の超伝導体
１０４〜１１０の外側にトラップされた磁束からのもれ
磁界がジョセフソン回路の動作に影響を与えないように
配置される。ここで、信号入力線１２１と信号出力線１
２２は、接地面１０１と第３の超伝導体１０３〜１１０
から絶縁されている。The third superconductors 104-110 are arranged so that the leakage magnetic field from the magnetic flux trapped outside the third superconductors 104-110 does not affect the operation of the Josephson circuit. Here, signal input line 121 and signal output line 1
22, the ground plane 101 and the third superconductors 103 to 110;
insulated from
第３の超伝導体１０４〜１１０は、第１の超伝導体、第
２の超伝導体、接地面１０１の超伝導体よシ高い超伝導
臨界温度ＴＣを持つ。ジョセフソン装置の温度を室温か
ら装置が動作する、たとえば４．２にの動作温度に徐々
に下げてゆく場合、第３の超伝導体１０４〜１１．０が
最初に超伝導状態へ転移する。The third superconductors 104 to 110 have a higher superconducting critical temperature TC than the first superconductor, the second superconductor, and the superconductor of the ground plane 101. When the temperature of the Josephson device is gradually lowered from room temperature to the operating temperature at which the device operates, e.g.
ここで反磁性によるエネルギー増加をＥＩ＆１磁束量子
がトラップされた時のエネルギー増加をＥ。Here, the energy increase due to diamagnetism is EI & 1 The energy increase when a magnetic flux quantum is trapped is E.
とする。第３の超伝導体１０４〜１１０が超伝導状態へ
転移する時、第３の超伝導体を貫いていた磁束量が磁束
量子（２，０１ｘ １ｏ−１１ｉウエバ）の１以下であ
るとする。Ｅ、＞２Ｅ１ 即ちＥ、−Ｅｌ）Ｅ、となシ
。shall be. It is assumed that when the third superconductors 104 to 110 transition to a superconducting state, the amount of magnetic flux penetrating the third superconductor is less than or equal to 1 magnetic flux quantum (2,01 x 1o-11i Weber). E, >2E1 ie E, -El) E, tonashi.
る残留磁界の大きさく磁束のトラップを生じさせない大
きさ）は４ミリガウスである。一方、従来のニオブ接地
面のみが配置された５ミリ角のチップの場合、許容でき
る残留磁界の大きさは０．０００４ミリガウス／ ｃｄ
となる。即ち、本発明によシ、残留磁界の許容値が４桁
改善される。４ミリガウス／ｄ程度の残留磁界は、３重
磁気シールドにょシ容易に実現できる。The size of the residual magnetic field (the size that does not cause magnetic flux trapping) is 4 milligauss. On the other hand, in the case of a conventional 5 mm square chip with only a niobium ground plane, the allowable residual magnetic field is 0.0004 mm Gauss/cd.
becomes. That is, according to the present invention, the permissible value of the residual magnetic field is improved by four orders of magnitude. A residual magnetic field of about 4 milliGauss/d can be easily achieved using triple magnetic shielding.
（第１の実施例）
本発明の第１の実施例の回路パターン図を第２図に示す
。(First Embodiment) FIG. 2 shows a circuit pattern diagram of the first embodiment of the present invention.
実施例の装置は、第１の超伝導体２０１と、第２の超伝
導体２０２と、第１の超伝導体２０１と第２の超伝導体
２０２の間に形成されたジョセフソン接合２０３、２０
４と１制御線２０５から構成される２接合スクイッドの
回路パターンである。２接合スクイッド回路の機能部は
、ジョセフソン接合２０３．２０４を含む破線で示した
領域２０６である。第３の超伝導体２１０は、２接合ス
クィッドの機能部の領域２０６の下面をおおうように配
置される。The device of the embodiment includes a first superconductor 201, a second superconductor 202, a Josephson junction 203 formed between the first superconductor 201 and the second superconductor 202, 20
This is a circuit pattern of a 2-junction SQUID consisting of 4 and 1 control lines 205. The functional portion of the two-junction SQUID circuit is the region 206 shown in dashed lines that includes the Josephson junctions 203 and 204. The third superconductor 210 is arranged to cover the lower surface of the functional region 206 of the two-junction SQUID.
２０４と制御線２０５から成る２接合スクィッドは、−
面上に接して設けられている。第３の超伝導体の゛＋１
．素片３０２の大きさは、２接合スクイッドよシ太きｉ
＜設定されている。これにより、第３の超伝導体５・の
素片３０２の外側にトラップされた磁束からの漏れ磁界
による影響を小さくしている。即ち、装置を冷却してわ
く時、超伝導臨界温度Ｔｃが最も高い第３の超伝導体２
１０が最初に超伝導状態に転移する。この時、残留磁界
は、第３の超伝導体の外側に排除される。第３の超伝導
体の素片３０２を多数個チップ上のジョセフソン装置に
配置すると。The two-junction squid consisting of 204 and control line 205 is -
It is placed in contact with the surface.゛+1 of the third superconductor
．． The size of the elemental piece 302 is thicker than that of the two-junction Squid.
<Set. This reduces the influence of the leakage magnetic field from the magnetic flux trapped outside the elemental piece 302 of the third superconductor 5. That is, when the device is cooled down, the third superconductor 2 has the highest superconducting critical temperature Tc.
10 first transitions to the superconducting state. At this time, the residual magnetic field is expelled to the outside of the third superconductor. When a large number of pieces 302 of the third superconductor are placed in a Josephson device on a chip.
チップを貫通している残留磁界は、第３の超伝導体素片
間にトラップされる。よって、ジ習セフソン回路の機能
部を直接貫ぬく磁束のトラップが除かれる。第３の超伝
導体の外側にトラップされた磁束量子からの漏れ磁界は
、第３の超伝導体の素片３０２を回路の機能部の領域よ
り太きくシ、かつ。The residual magnetic field penetrating the chip is trapped between the third superconductor pieces. Therefore, the trap of magnetic flux that directly penetrates the functional part of the Ji-Sefson circuit is eliminated. The leakage magnetic field from the magnetic flux quanta trapped outside the third superconductor causes the elemental piece 302 of the third superconductor to be thicker than the functional area of the circuit.
第３の超伝導体の素片３０２と回路の機能部との立体配
置を近づけることによって小さくすることができる。The size can be reduced by bringing the three-dimensional arrangement of the third superconductor element 302 and the functional part of the circuit closer to each other.
−以上、本実施例によシ、ジ田セフソン回路の機（第２
の実施例）
ｍ−）」
）・ｊ、第４図に本発明の第２の実施例を示す。本実施
第３の超伝導体の素片４０１は１２接合スクィッド回路
上に配置されている。第３の超伝導体の素片４０１は、
制御線２０５を流れる電流が作る磁界が。- As described above, according to this embodiment, the Jita Sefson circuit machine (second
A second embodiment of the present invention is shown in FIG. 4. The third superconductor piece 401 of this embodiment is placed on a 12-junction SQUID circuit. The third superconductor piece 401 is
The magnetic field created by the current flowing through the control line 205.
２接合スクィッドと高い割合で結合するように。Now combines at a high rate with 2-joined Squids.
制御線２０５から十分陥れた位置に配置される。たとえ
ば、制御線２０５と第３の超伝導体の素片の間隔は、制
御線２０５と第１の超伝導体２０１の間隔の２倍以上が
設定される。本実施例においても、磁束トラップに関し
て第１の実施例と同一の効果が得られる。It is placed at a position sufficiently recessed from the control line 205. For example, the distance between the control line 205 and the third superconductor piece is set to be twice or more the distance between the control line 205 and the first superconductor 201. In this embodiment as well, the same effects as in the first embodiment can be obtained regarding the magnetic flux trap.
（第３の実施例）
第５図に本発明の第３の実施例の回路パターン図を示す
。本実施例は、第１図（ｄ）を抵抗結合型パルス発生回
路に対して具体化した例である０第６図は、第５図の回
路パターンをＡＢ面で切断した時の断面図である。本実
施例の回路は、第１の超伝導体５０１．５０２と、第２
の超伝導体５０３，５０４でいる。第３の超伝導体の素
片５１０ 、５１１は抵抗結合型回路の機能部であるジ
ョセフソン結合５０５゜５０６を包む領域に、かつ回路
の上、下に配置されている。本実施例によシ、抵抗結合
型回路の機能部であるジョセフソン結合５０５． ５０
６を貫ぬく磁束トラップが除去され、第１の実施例と同
一の効果が得られる。(Third Embodiment) FIG. 5 shows a circuit pattern diagram of a third embodiment of the present invention. This embodiment is an example in which FIG. 1(d) is applied to a resistance-coupled pulse generation circuit. FIG. 6 is a cross-sectional view of the circuit pattern shown in FIG. 5 taken along the AB plane. be. The circuit of this example has a first superconductor 501,502 and a second superconductor 501,502.
They are superconductors 503 and 504. The third superconductor pieces 510 and 511 are arranged in a region surrounding the Josephson couplings 505 and 506, which are functional parts of the resistance-coupled circuit, and above and below the circuit. According to this embodiment, a Josephson coupling 505. which is a functional part of a resistive coupling type circuit. 50
The magnetic flux trap passing through 6 is removed and the same effect as in the first embodiment is obtained.
（発明の効果）
以上１本発明は、ジョセフソン回路中に用いられている
超伝導体より高い超伝導臨界温度を持つ第３の超伝導体
で回路の機能部を包んだことを特徴とする装置である。(Effects of the Invention) The present invention is characterized in that the functional part of the circuit is wrapped in a third superconductor having a higher superconducting critical temperature than the superconductor used in the Josephson circuit. It is a device.
本発明によシ、ジョセフソン回路の機能部への磁束のト
ラップが除去され、回路の誤動作を防ぐ効果が得られる
。さらに、本発明によシ、許容できる残留磁界の大きさ
が大きくなるので、ジョセフソン装置の磁気シールドが
簡単になる。第３の超伝導体を必要部分のみに限定し、
かつ漏れ磁界も考慮し、できるだけ細分した素片を多数
個チップ上に配置する程１本発明の効果は、大きくなる
。According to the present invention, trapping of magnetic flux to the functional portion of the Josephson circuit is eliminated, and an effect of preventing malfunction of the circuit can be obtained. Furthermore, the present invention simplifies magnetic shielding of the Josephson device because the magnitude of the allowable residual magnetic field is increased. Limiting the third superconductor to only the necessary parts,
In addition, taking leakage magnetic fields into consideration, the effect of the present invention becomes greater as a larger number of fragments are arranged on a chip.
第１図は、本発明の詳細な説明するための本発明の装置
の概略図で図（ａ）に平面図を図（ｂ）〜（ｅ）に断面
図を示す。第２図は本発明の第１の実施例の回路パター
ン図、第３図は第２図の回路パターンをＡＢ面で切断し
た断面図、第４図は本発明の第２の実施例を示した断面
図、第５図は本発明の第３の実施例の回路パターン図、
第６図は第５図の回路パターンをＡＢ面で切断した断面
図である。
１０１−接地面、１０２・ジョセフソン回路の機能部。
１０３〜１０７ ：第３の超伝導体、２０１・・・第１
の超伝導体１２０２・・・第２の超伝導体、 ２０３．
２０４・・・ジョセフソン接合、２０５・・制御線、
２０６・・・ジョセフソン回路の機能部の領域、２１０
・・・第３の超伝導体、３０１・・・接地面、３０２．
４０１ 第３の超伝導体の素片、 ５０１．５０２
・・第１の超伝導体、 ５０３．５０４・・・第２の超
伝導体、 ５０５．５０６・・・ジョセフソン接合。
５（１７，５０８・・・抵抗、 ５１０．５１１・・・
第３の超伝導体の素片、６０１・・・接地面。
王群目１唇：：７院長
Ｓ
第１図
第１図
１０１＝接地面
１０２：ジョセフソン回路の機能部
１０３〜１１０：第３の超伝導体
１１１：基板
１２１：信号入力線
１つつ・ノ舌旦中千福自
２０１：第１の超伝導体 ２０５：制御線２０２
：第２の超伝導体 ２０６：機能部の領域２０３
、２０４ ： ジョセフソン接合２１０：第３の超伝
導体第３図FIG. 1 is a schematic diagram of an apparatus of the present invention for explaining the present invention in detail, and FIG. 1(a) shows a plan view, and FIG. 1(b) to (e) show cross-sectional views. FIG. 2 is a circuit pattern diagram of the first embodiment of the present invention, FIG. 3 is a sectional view of the circuit pattern of FIG. 2 taken along the AB plane, and FIG. 4 is a diagram of the second embodiment of the present invention. 5 is a circuit pattern diagram of the third embodiment of the present invention,
FIG. 6 is a cross-sectional view of the circuit pattern of FIG. 5 taken along the AB plane. 101 - Ground plane, 102 - Functional part of the Josephson circuit. 103-107: third superconductor, 201...first
superconductor 1202... second superconductor, 203.
204... Josephson junction, 205... control line,
206... Area of functional part of Josephson circuit, 210
. . . third superconductor, 301 . . . ground plane, 302.
401 Third superconductor piece, 501.502
...First superconductor, 503.504...Second superconductor, 505.506...Josephson junction. 5 (17,508...resistance, 510.511...
The third superconductor piece, 601...ground plane. King Group Eye 1 Lip: :7 Director S Figure 1 Figure 1 Figure 1 101 = Ground plane 102: Josephson circuit functional parts 103 to 110: Third superconductor 111: Substrate 121: Signal input line 1 Tsutsu/Notondan Nakasenpukuji 201: First superconductor 205: Control line 202
: Second superconductor 206 : Functional region 203
, 204: Josephson junction 210: Third superconductor Fig. 3
Claims (1)
に絶縁体を介して形成された、互いに絶縁された第１の
超伝導体と第２の超伝導体と、前記第１及び第２の超伝
導体の一部に形成されたジョセフソン接合とを含むジョ
セフソン装置において、前記接地面と第１及び第２の超
伝導体のいずれよりも高い超伝導臨界温度を持つ第３の
超伝導体を前記ジョセフソン装置中に多数個備えたこと
を特徴とする磁束トラップ防止型ジョセフソン装置。At least a ground plane made of a superconductor, a first superconductor and a second superconductor formed on the ground plane via an insulator and insulated from each other, and the first and second superconductors. a third superconductor having a higher superconducting critical temperature than both the ground plane and the first and second superconductors; A magnetic flux trap prevention type Josephson device, characterized in that a large number of superconductors are provided in the Josephson device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60021923A JPS61182282A (en) | 1985-02-08 | 1985-02-08 | Magnetic flux trap preventive type josephson device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60021923A JPS61182282A (en) | 1985-02-08 | 1985-02-08 | Magnetic flux trap preventive type josephson device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61182282A true JPS61182282A (en) | 1986-08-14 |
| JPH055193B2 JPH055193B2 (en) | 1993-01-21 |
Family
ID=12068588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60021923A Granted JPS61182282A (en) | 1985-02-08 | 1985-02-08 | Magnetic flux trap preventive type josephson device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61182282A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04214684A (en) * | 1990-09-30 | 1992-08-05 | Daikin Ind Ltd | Squid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58129657U (en) * | 1982-02-24 | 1983-09-02 | 富士通株式会社 | Mounting structure of Josephson junction element |
-
1985
- 1985-02-08 JP JP60021923A patent/JPS61182282A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58129657U (en) * | 1982-02-24 | 1983-09-02 | 富士通株式会社 | Mounting structure of Josephson junction element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04214684A (en) * | 1990-09-30 | 1992-08-05 | Daikin Ind Ltd | Squid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH055193B2 (en) | 1993-01-21 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |