JPS6192036A - Superconducting electronic circuit - Google Patents

Abstract

PURPOSE:To form a high-density superconducting electronic circuit by using the magnetic flux generated from a Josephson element to control the fluxoid quantum in a superconducting loop. CONSTITUTION:Since Josephson elements J3 and J3' of a superconducting loop R1 exist in a loop R2, both loops are coupled, and the magnetic flux generated by elements J3 and J3' passes the loop R2. At this time, it is judged that the product between an inductance L of loops R1 and R2 and a current I0 satisfies the condition of LI0<<PHI0, and the inductance L is ignored. In case that a current Ic is equal to 1.2I0, I1 is equal to I0, and an element J1 takes one fluxoid quan tum in the loop R1, and the current I1 is reduced up to 0.3I0. Since I2 is increased momently from about 0.2I0-0.9I2 at this time, the magnetic flux generated in elements J3 and J3' is applied to the loop R2. Since a current Ig flowed at this time is reduced quickly in case of Ic=1.2I0, Ig is shunt to a load resistance RL to supply a current IR to a load because the loop R2 goes to the voltage state if Ig is set to 1.5I0 and is flowed preliminarily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a superconducting electronic circuit used in logic circuits and memory circuits.

[Conventional technology]

Conventional superconducting n-n circuits use magnetic flux quanta 4 as an information medium.
1. :2D7Karig Web is used. Therefore, the inductance L of the circuit and the operation mechanism. The relationship is '
L.I. =Φ. The 0(7-1) diagram, which requires satisfying the relationship □°(1), is a conventional superconductor that stores two magnetic fluxes in a superconducting loop consisting of a Josephson element J and inductances L1 and Ll. It is a memory circuit.
P44, edited by the Institute of Electronics and Communication Engineers, 1981). (7-1) Ig current is passed between 11) and (1)' shown in the figure, and (21,
(By passing a current of x between 21 and 21, one or several magnetic flux quanta are introduced into the loop from the Josephson element J and stored. G is the readout gate (3), (
When a current is passed between 33' and a magnetic flux quantum exists in the loop, G becomes a voltage state, and the presence of a magnetic flux quantum is detected.

[Problem that the invention seeks to solve]

The condition that this loop can store at least one magnetic flux quantum is (L, +L,) T4" Φo(2). (7-
2) Ik shows the actual circuit configuration method, and only Josephson elements and loops are shown for simplicity. A superconducting film G is formed on the substrate S, and an insulating layer is formed thereon,
A superconducting loop having a width W and a total circumference 41 including the Josephson element J is formed on this to form a memory circuit. Calculating the inductance L at this time results in the following equation.

L: μo('',''' 41 13) where 8 is the vacuum permeability and λ is the superconducting magnetic field penetration depth.

a is the thickness of the insulating layer I. Now, TeNb is used as a superconducting material.
For this purpose, λZ300X, a=10OA, W=1μm, ■. =50μA, and finding the length for which (2) holds, we get / =XOOμm. In order to further reduce this size and form high-density electronic circuits, there is a need for engineering. Although it is necessary to increase , it is difficult to increase it beyond a certain level due to limitations such as operating margin. Therefore, conventional superconducting memory circuits have a diameter of approximately 10
It was difficult to configure the thickness to be less than μm.

[Means for solving problems]

The present invention eliminates the above-mentioned difficulties and provides a superconducting sub-circuit that allows superconducting electronic circuits to be configured in an ultra-small size.

First, we will discuss the properties of magnetic flux quanta in a superconducting loop or cylinder. (8-1> As shown in the figure, there is a magnetic flux preelectricity in a superconducting cylinder of thickness d and radius r, and the cylinder has a current density J
Think about the state where is flowing. At this time, the following formula holds true. λ22πrJ 10Φ=Φ. Φ；Internal magnetic flux (
4) Here, Maxwell's equation J=Φ4. z r2. of(
4) Substituting into the equation yields the following equation.

Φ = to/(1+2λ”, ;, )
15) From equation (5), when rd becomes smaller than λ2, the value of Φ becomes smaller than 0. Therefore, it has been thought that it is difficult to detect the internal magnetic flux Φ of the cylinder. However, (8-2
) It was found that when the internal magnetic flux Φ of a superconducting cylinder is measured using a measuring device that uses electron beam interference as shown in Figure 9, it becomes as shown in Figure 9. (8-2) The measurement device shown in the figure is a device designed to emit electrons from an electron gun and cause the electrons that pass on both sides of a superconducting cylinder to cause interference on the interference surface, and there is no magnetic flux inside the cylinder. In this case, an interference pattern with high electron beam intensity appears at the center point O as shown in Tsukasa. If there is an odd number of magnetic flux quanta in one direction, an interference pattern with low electron beam intensity is observed at the center as shown in Φ. can. Figure 9 shows the results of measuring the internal magnetic flux of a lead superconducting cylinder using this, and since there is equation (5),
The theoretical value of Φ becomes much smaller, but the measured value remains false.

This phenomenon can be easily understood. First, by substituting Maxwell's equation Φ=hπ-dJ into equation (4) to make the equation only for the current density J, we get μλ2πrJ=J within 18π. (6) Here, λ=m/μ. 2♂n(mik child it, e; charge.

n; electron density) and J = nev (v; 'C velocity)
By substituting
If you ignore d, mvr=ball h; blank constant (
8). The left side mvr is the angular momentum of the electron, and equation (8) represents the state in which the angular momentum of the orbiting electron is quantized by 5. The magnetic moment M associated with this C2 is the magnetic moment accompanying the orbital motion of the boron It is considered to have the same value as the moment, and the magnitude of the magnetic flux is h /2e = 4po.

That is, although the first term on the left side of equation (4) was conventionally thought to be unobservable as magnetic flux, it is thought to be observable, and the negative S9 diagram is one of the proofs.

In other words, it can be considered that magnetic flux is generated due to the angular momentum of the electrons.

To further prove this, we conducted the following experiment. (10-1) The figure shows a superconductor including one Josephson element: 3 loops R1 and R2 are placed one on top of the other, and a magnetic flux φ is applied from the outside. When R1's internal magnetic flux Φi is applied, the internal magnetic flux Φi of R1 is quantified, and this is transferred to the electronic circuit that drives R2 and the tank circuit T.
This is a circuit that measures magnetic flux.

(10-2) The figure shows a situation in which when moxibustion is applied to the loop R1, a circulating current I flows and a star of internal magnetic flux Φ is generated at this time. If the phase of the Josephson element is ψ, then engineering = engineering. Since there is a relationship of sin ψ, the equation for magnetic flux quantization is expressed by the following equation.

Engineering here. is the maximum current of the Josephson device.

ψ one Φo+ C%+ L i, pin ψ) = “Φ.
(9) 2π This equation corresponds to equation (4), where each term on the left side is a term due to electron momentum and each second term is a term due to magnetic flux, and the internal magnetic flux Φ1 is Φ1 = Φ, −1−L I, sinψ
It is a@.

L.I. /Φ. A comparison of the experimental value when =0.52it and 1/2π and the theoretical value derived from the ClO equation (9) is shown in 1.
Shown in Figure 1.

As you can see from the figure, there are large differences between experiment and theory, especially L
1. It is remarkable when yloo is small, and the observed internal magnetic flux is always Φ. This is the same as in Figure 9. This indicates that the contribution of the internal magnetic flux not only from the second term on the left side of equation (9) but also from the first term can be observed. This indicates that the Josephson element generates magnetic flux associated with momentum.

The present invention provides a superconducting electronic circuit that controls fluxoid quanta using 5 magnetic fluxes associated with the angular momentum of the Josephson element described above, instead of the conventional method of controlling magnetic flux quanta via electromagnetic inductance L. Since it does not require any electromagnetic inductance, it is possible to realize high-density electronic circuits defined only by the dimensions of the Josephson element.

(1-1) The figure shows the top surface of the superconducting thin film S being oxidized to make oxide masonry to a thickness of about 2OA, and a part of it being overlapped on top of this to form the superconducting thin film S2. This is a tunnel type element in which a Nisho-Sefson element J is formed. When a Josephson current IJ is passed through this, the phase ψ of the Josephson element is IJ = Iosin9'
(11).

Engineering here. is the Josephson maximum current.

I is maximum when ψ=π/2, and in this case, I
J = I. bawl. At this time, the magnetic flux associated with the momentum generated by the Josephson element is calculated from the first term on the left side of the QOI equation as 'J = 2K 2 = 4' (
``D.'' That is, the maximum magnetic flux generated by the Josephson element is the + of the quantum circle.

(1-2) The figure shows a bridge-type element in which a groove is formed in a part of the superconducting thin film S, and the lower part of this groove is a Gieseson element and J. In this case, the magnetic flux Φ of maximum weight /4, The present invention generates the maximum Φ generated by the Josephson element. /4 magnetic flux is used to control fluxoid quanta in a superconducting loop including a Josephson element.

[For production]

That is, as shown in (1-3), a Josephson element J,
If we arrange a superconducting loop R including a Josephson element J, which is in close contact with the dimensions of J, and apply an input current Ii to Jl, and make this value about the critical current I0 of J, then Jl Since the magnetic flux generated by is coupled to the loop R as shown in the figure, a magnetic flux can be applied to the loop R, and an output current flows through R due to this magnetic flux.

In this case, the magnetic flux generated by J gives a constant maximum value snow/4 regardless of the dimensions, so Josephson elements J and J,
The dimensions of the loop R and the loop R may be made as small as possible as long as the relative relationship shown in the diagram (1-3) is maintained. Also, loop R
Since the magnetic flux generated by the Josephson element J2 by the output current generator 2 in
There is little impact on the input side, and input and output can be separated. (
1-4) It is also possible to place the input circuit J close to the outside of the loop R as shown in the figure, and couple the magnetic flux due to Jl to the node ν-R.

〔Example〕

(2-1) The figure shows an example of a switching gate using a zero voltage state and a finite voltage state for use in a logic circuit according to the present invention (2).
The superconducting loop R1 containing the input current ■. A power supply current is applied to the loop R2 including the Josephson element Ja=Js, and the output resistor R1 is connected to this terminal.

Since element J6 of R1 and element J6 are in the loop of R2, both loops are coupled, and the magnetic flux generated by J and J- is designed to pass through R2. At this time, the inductance L of R1 and R2. The product of is L I,
L is ignored as it satisfies the condition of C131.

(2-2) The figure shows only R1, which is the input current I. When , the current is divided into the electric current flowing to J and the current I2 flowing to the branch other than J, but this situation is (2-
3] Shown in the figure. That is, the + of IC flows to I, and the remaining 4- flows to I, but the paste = 1.2I. When I, = I. Next door J.

takes fluxoid quanta into R1, and .

decreases to 0.3 Io. At this time, engineering is approximately 0.
2 I.

From 0.91. It increases approximately between N up to N. At this time (2-
1) Figure-C-J- and J: Q, 9I. Since they are flowing, the magnetic flux generated by these two elements is approximately π 2Cπ

(2-2> This is the reason why there are five Josephson elements in the branch where the circuit flows in the R2 loop in the figure.

Engineering. =1.2I. When the number of fluxoid quanta is J,
When the quantum is absorbed more, the value of q rises rapidly as shown in the diagram (2-3), but unless this value is other than q, the captured quantum escapes from one of the elements in the branch of q. The condition for the quantum to stay within R2 without escaping is when there are five or more elements in the branch of the finite element.

The 1g-% characteristic when external magnetic flux % is applied to R2 is (2
-4) Inductance L and I of ○R2 shown in the figure, +7)
Product LI. When the conditions of the four formulas are satisfied, as shown in Figure (2-4), when % = 0, trench = = 2i. It can flow, but %:
At o/2, there is a periodic change such that (=0), the inside of the broken line is in a superconducting state, and the outside is in a voltage state.

Now ■. , and when one quantum is taken into R1, the magnetic flux instantaneously applied to R2 is α4 equation, so it becomes point (a) in Figure (2-4), and the - flowing at this time becomes (
Up to point b), the season is 5 (-Ic=
It decreases rapidly at 1.2I6. This aO- is 1
．． 5 engineering. If you let the current flow in advance, R2 will be in a voltage state, so - will be shunted to the load resistance shown in the figure (2-1) and IR
(7) Supply TE flow to the load.

That is, (2-5) factor==Igt), I. = Sink until J0.

(a) Bias is applied to the input signal Δ. When the voltage is applied, it becomes the point O)), but since this state is a voltage state, (2-1) in the figure I,) begins to shunt (2-5).
) The voltage state is maintained until - reaches point (C) in the figure. (
The current ∆, which is the difference between point b) and point It is clear that the current gain of this gate is ΔIg/Δ
There is no engineering. =1.2I. Since it is determined by the slope of - which decreases rapidly when , the current gain can take a value much larger than 1. Also, the magnetic flux generated by J and J- is R2
By separating 4 and 4 from the input circuit R1, the magnetic flux generated by J4 and 4 can be applied to R1, and the input and output can be applied to R1, so the input and output are both direct current and alternating current. It can also be separated.

Returning this gate to the zero state again, Dingζ2 makes k Ic <
-0,4X.

It is clear from Figures (2-3) and (2-5) that it is sufficient to do so. At this time, the L element in R1 is discharged from J, and , and , return to values close to zero, and ■, also recovers to about 2 I,.

By the way, in order to estimate the dimensions for which conditional expression (13) holds, considering the circuit shown in figure (7-2), it becomes from the front hole of L in expression (3).

Considering a rectangle with = 4W, it is 16μ. (2λ+a)IO<<Φ. residence 5)
In the example of the adjacent corner, 2λ+a':? If it is 500A, Io
<< 2 mA, and it is clear that equation 13 holds true below I = 100 μA.

(2-6) The figure shows another example of a switching gate using a zero voltage state and a finite voltage state, where an input current k is applied to a superconducting loop R4 including a Josephson element J and an inductance L, and the Josephson A power supply current Ig is applied to a loop R3 including elements J, , J, and an inductance L, and an output resistor RI is connected to this terminal.

The two loops R3 and R4 are magnetically coupled and J
, and so that about half (50%) of the magnetic flux generated by the magnets is applied to R3. Now, L, I. 21/2π=0
, 17Φ. Then, the relationship between R4 and the internal magnetic flux Φi is as shown in Figure (2-7). At =3I0, Φi suddenly changes from zero to the value of Φ. On the other hand, the pair of applied magnetic flux % of R3 The relationship is R21,≦Φ.//2□, then (2-8
) As shown in the figure, - changes periodically depending on the percentage. Now (2
-7) Work on the diagram. Engineering. = 3 constructions. When added, the magnetic flux Φ generated by R4. Since half of is added to R3, at this time (2-8
') In the figure, eI) e-0,5Φ. I will be joining
-0. Therefore, the relationship between k and g is as shown in figure (2-9), and when I, = 3 I, is added, ζ becomes 2 I
It suddenly changes from o to o. For this reason, - is set to 1°8 in advance.
Engineering. If the current is allowed to flow to a certain extent, R3 becomes a voltage state, so that Ig is shunted to the resistance ratio shown in the diagram (2-6), and this becomes the load current.

In other words, - and ■ in figure (2-9). When bias is applied to point (a) by applying the input signal Δk, it becomes point Φ), but since this state is a voltage-state (2-6), in the figure, the current is shunted to R1. This shunt current can flow by ΔIg in figure (2-9), and this becomes the output current, so the current gain is Δ■g/Δμ. is shown in figure (2-9). =31
Since the change at 0 is rapid, a value much larger than 1 can be obtained. The magnetic flux generated by J, is made not to couple to R4, and I. If ≦ηπ fly, then R2
Since the magnetic flux generated is less than 0.17Φ, the input and output are almost separated.

Also, as shown in the figure (2-9), since the Ig-I characteristic does not have hysteresis, it takes Δ to return R3 to zero voltage.

Just set it to zero.

(3-1) The figure shows an example of a logic gate using fluxoid quantum states, with a Josephson element J1 ' 21 '5
1J4. A superconducting loop R1 including J, , J6 is configured such that a power supply is applied, and an input current I is applied to an input circuit including a Josephson element J coupled to this loop R. ``(32) The figure shows a state in which the fluxoid has no children inside the external magnetic angle in the loop R, and the triangle marked with 1 shows a region where one quantum exists stably.Now, let Ig be (a) The input signal current I
If i is about flowing L, the magnetic flux generated in Figure Ji (3-1) is about )/4, so this is added to R and becomes (3
-2) The point (b> reaches the point Φ) shown in the figure is in a single quantum state, so the quantum enters the loop R through J, and the resulting output current 4 is (3- 1) Flow as shown in the diagram. This output current is '21J5'J4. in loop R. J, , J6 can each be used as an output of the next stage, so the fanout can be 5. That is, the degree of signal amplification is 5, which can drive 5 subsequent stages with input current I0 and output current. At this gate (3-3), Iis and Iia are connected as shown in the figure.
(3-4)
If the threshold value Igl in the figure is biased by 1g and the magnetic flux of the town is applied to the loop by one input tunnel flow I, (3-4) the point (a) in the figure is obtained, so the power ''' When the input signal of it enters, the gate enters the 1 state and an OR gate is formed.Also, (3-4) biasing I to the pg point in the figure is reached, so it becomes an N-mount gate.

Since this gate uses a quantum state as an information medium, it does not enter a voltage state, so it has the advantage of lower power consumption than the gate shown in Figure 7.

(4-1) The figure shows an example of a high-gain gate using fluxoid quantum states according to the present invention, including a superconducting loop R1 consisting of four Josephson elements J6 and one Josephson element J, and four elements. A loop R2 consisting of J4 and one conductor applies a power supply current Igv to a circuit divided by an output circuit consisting of four elements J, and a Josephson element J is connected to a part of the output circuit. Input circuits including
It is arranged so that an input current Ii can be applied thereto.

Now, when the input current Ii is made to flow in the direction shown in the diagram (4-1), a small current flows in the output circuit connected thereto in the Ii+ direction. This current is divided into currents in the opposite direction to J and J2 as shown by the arrows.In this state, if Ig is increased, the currents in J2 are added together, and in J, there is a difference, so 4 reaches 10 first, and the fluxoid quantum invades loop R2. 4-2) As shown by the circular arrow in the figure, the circulating current becomes 1.
．． Since the current flows to an extent of 1.0% in the direction of the arrow, the output element J has a current of 1.
≦Eng. current flows.

If the input current flows in the direction opposite to that shown in (4-1) as shown in (4-3), a small current will flow in i and 4 in the direction of the arrow, increasing ■. And this time J.

Since the currents are added at J, 1. , a quantum enters from J, and the circulating current shown by the circular arrow in the figure (4-4) flows, and a current flows in the output element J in the direction opposite to that shown in the figure (4-2). Which of Jl and the mountain switches first depends on the direction of the input current Ii, and in principle, its value can be any small value, so if the input current I is very small,
Accordingly, the output element has 1. A single output current of about 100% is generated, and a large current increase degree can be obtained.

(4-5) The figure shows that I+i t :t, l with time t
This shows how Ig changes, and when Ig is increased after adding a small current Ili due to input current Ii, Iti
When is negative, the output flow is positive, and when I and i are positive, the output is negative, indicating that the current amplification degree ``+Ali'' can be increased.Also, (4 -1) Since five output elements are connected in the output circuit shown in the figure, the fanout is 5.0 (4-1) In this gate shown in the figure, connect four junctions each to R1 and R2゜■. The reason for using this is that the equivalent circuit seen from point (a) and point 51 is the parallel connection of J and J4, and the element J of R1,
are connected in series, as shown in the (4-6) diagram, and the design is such that the total number of loops is equal to (6+1). This is because (5+1) or more elements are required for the L element entering from J to stay stably in the loop. The signal propagation through this gate is (5-1) II
Arrange the first stage gate (1) and second stage gate (2) as shown in J, and first flow the power supply current into the first stage gate (1) as shown in figure (5-2) and then connect the output of (1). Crab, after getting (5-
2) As shown in the figure, when 1g2 is added, the output current 12 in (2) is changed and the signal propagates. In this case, the signal input is “il '”i! 'There are three inputs for engineering ii,
Since these inputs are either positive or negative, the state of the first stage (1) is determined by a majority vote of the three inputs, and majority logic is performed.

Therefore, this gate has high gain, low power consumption because it uses a quantum state, and has the characteristics that the input and output are separated both in direct current and alternating current because the input part and the output element are separated.

(6-1) The figure shows an embodiment of a fluxoid quantum memory circuit according to the present invention, in which an address δ is connected to a superconducting loop R1 consisting of a Josephson element J and two elements J and J'.
& Sumi current Iyl is applied, and two elements J are connected to this loop R1.
4 is coupled and the P) E prototype XI is applied to this element.

R1 is a circuit that stores fluxoid quanta, and its change in Jy+ due to external magnetic flux Φ is shown in figure (6-2).

First, IXI has 1. When a current of about 100% is applied, the magnetic flux generated by 54 becomes about 3/2, so it reaches point Rx in the figure (6-2).

Here, when a current of 1 is applied to Iyl, the point W1 is reached, and even if the quantities IIy and Iy are returned to zero, a one-quantum state is maintained, and information 1 is stored in R1. The circuit for reading out the state of information 1 is loop R2, which consists of a Josephson element J5 and a read address current 1. is applied, and one element J2 of loop R1 is coupled to this loop R2, so that a magnetic flux is applied to the loop. Further, an element J6 through which the readout pit s flow AE2 flows is coupled to R2. The characteristics of I of R2 and external magnetic flux Φ8 are shown in Figure (623). If information 1 is now stored in R1, a current of about 100% is flowing through element J2, and a magnetic flux of about 1/4 is applied to R2. (6-3) At point M1 in the diagram. be. At this time I
Worked on X2. When a certain amount of current is applied, J6 generates 1/4 of the magnetic flux and applies it to R2 (6-3), reaching point Rx in the figure.

Furthermore, when I and 2 are supplied with a current of 2, the point Rs is reached, but since this state is neither 0 nor 1, the element peak and J5 are in a voltage state, and a voltage is generated at the terminal I, changing the storage state of information 1. Can be read.

Eh, there is a negative current ■. (6-2) WO in figure
The point is reached, but this point has only the 0 state of R1, so the information is 0.
is written. When R1 is in the O state, no current flows through R1, so the magnetic flux generated by J2 is O, and therefore R
2 is at the MO point in the (6-3) diagram.

At this time, IX2 was installed. If you add a certain amount, it becomes M1 point, and
.

If you add up to L, you will reach the R0 point, but this state remains the 0 state of R2, so J5. No voltage is generated at J,', so information 0 and 1 can be distinguished.

R2 reads the 1 state of R1 and J, + is the voltage state (
Since these elements are arranged so as not to be coupled to R1 even if the voltage is increased, the memory circuit has the advantage that non-destructive reading can be performed and the operation speed is high due to the generation of electricity by these elements. Furthermore, since no electromagnetic inductance is required, the structure can be made as small as processing technology allows, and a high-density integrated circuit can be realized.

〔Effect of the invention〕

As described in detail above, since the magnetic flux generated by the Josephson confectionery according to the present invention can be reduced to less than one of the amount of the superconducting loop, it is possible to realize a superconducting electronic circuit with a density more than 100 times higher. becomes possible.

[Brief explanation of the drawing]

(1-1) IJ) Channel type Josephson device diagram (1-2)
) diagram Bridge type Jose7n element diagram (1-3) diagram
A diagram (1-4”) of a method of applying magnetic flux according to the present invention to a superconducting loop A diagram (2-1) of a method of applying magnetic flux according to the present invention to a superconducting loop A configuration diagram of a switching gate according to the present invention (2-2) Figure Input circuit diagram (2-3) Figure Characteristic diagram of input circuit (2-4) Characteristic diagram of gate circuit (2-5) 11 Characteristic diagram of switching gate (2)
Fig. -6) Configuration diagram of the switching gate according to the present invention (2-7) Fig. Characteristics of the input circuit (2-8) Fig. Characteristics of the gate circuit (2-9) 9 Characteristics of the switching gate (3-1)
) Figure Switching gate diagram according to the present invention (3-2) Characteristic diagram of switching gate (3-3) Figure 0 gate configuration diagram (3-4) Figure AND and O
R operation diagram (4-1) Figure switching gate according to the present invention (4-2) Figure switching gate operation diagram (4-3) IJ Switching gate operation diagram 1 (4-4) lla Switching gate (4-5) Characteristic diagram of switching gate (4-6) Equivalent circuit diagram of switching gate (5-5)
1) Figure 5-2 is a diagram explaining the propagation of a signal through this gate. Figure 6-1 is a diagram of how to apply a source current.
Diagram explaining the operation of the memory circuit (6-3) Diagram explaining the operation of the memory circuit (7-1) Diagram of the conventional superconducting memory circuit (7-2)
Configuration diagram of the superconducting electronic circuit (8-1) Diagram of the i-channel inside the superconducting cylinder (,8-2) Diagram of the magnetic flux measuring device inside the superconducting cylinder (9)
Figure Magnetic flux measurement result in superconducting cylinder (10-1) Figure Magnetic flux measurement circuit in superconducting ring (10-2) Equivalent circuit diagram of superconducting ring (11) [/ Magnetic flux measurement in superconducting ring Result chart October 11, 1980 Sue Z-, Near 7m 7Z-2 addition] 1-3M 7g-, 1111 Pu 2-21 Fu Z-V rod? - Begging Go Z - f cheek 7 Z - ρ So-called Go? -7itj F i - diagonal chain pu! -〃Side 7I7-1/II 7 No Separation 70-9 Penalty A Ku 1 Add 72-Reward 7β-Rejection 7θ-2υ 10 Nose'y%10-1 Column Φ6 7//Side Procedural Amendment 1985 6 Shiga, Commissioner of the Patent Office, July 7th Word count: p,,,,,. 2. Name of the invention Superconducting i-conductor circuit 3. Relationship with the case of the person making the amendment Patent applicant Tsutomu Yamashita 5° Amended Umbrella Ordinance dated 0, Self-Fwa Year Month Day 6
, Target of amendment Drawing "Figure 2-9" (symbol addition only) Foundation

Claims (1)

[Claims] By applying a current to an input circuit consisting of one or more series Josephson elements placed in close proximity to a superconducting loop having one or more series Josephson elements, the magnetic flux generated by the series Josephson elements can be reduced. A superconducting electronic circuit characterized in that a predetermined function is obtained by applying flux to a superconducting loop to introduce, retain, or exclude fluxoid quanta into the superconducting loop.