CN101626233B - Resistive superconductive asynchronous bilinear logic universal gate circuit - Google Patents

Abstract

The invention relates to a resistive superconducting asynchronous two-wire logic general-purpose gate circuit. The current logic gate structure of the superconducting asynchronous two-wire circuit has the defects of too many Josephson junctions and difficult wiring. The invention includes four Josephson quantum interferometers and two choke resistors, and each Josephson quantum interferometer is composed of four Josephson junctions and three connecting inductances. Two adjacent Josephson quantum interferometers share two Josephson junctions. The logic gate structure proposed by the present invention uses resistance to consume the loop current remaining in the gate circuit after the logic gate is triggered, so that the number of required Josephson junctions is greatly reduced. The invention takes the convenience of wiring into consideration well, and the circuit layout of the sequence structure is easier to be applied in the large-scale superconducting integrated circuit than the prior art.

Description

Resistive superconducting asynchronous two-wire logic general-purpose gate circuit

technical field

The invention belongs to the technical field of superconducting digital circuits, and relates to a resistive asynchronous dual-rail (Dual-Rail) logic general-purpose gate circuit structure used in superconducting RSFQ (Rapid Single Flux Quantum) digital integrated circuits. Use combiners to form AND gates, OR gates, and XOR gates.

Background technique

In 1985, K.K.Likharev, O.A.Mukhanov and V.K.Semenov proposed a logic circuit technology based on Josephson junctions, that is, superconducting fast single flux quantum (Rapid Single Flux Quantum) technology.

A Josephson junction consists of a weak link (usually a tunnel junction) between two superconductors. The junction can switch between superconducting and normal states on the order of picoseconds. A concomitant single flux quantum voltage pulse is generated across the junction during the switching process. Fast single magnetic flux quantum digital circuit technology is to use single magnetic flux quantum voltage pulse to represent digital information.

The traditional way is shown in Figure 1(a). Between the two voltage pulse gaps of the clock line in the circuit, if there is a voltage pulse input on the signal line, it means a signal "1", and if there is no voltage pulse, it means a signal "0". ". Circuits in this synchronous mode are particularly sensitive to input delay, especially for superconducting integrated circuits with a clock frequency of hundreds of GHz. In 1996, Changping Maezawa et al. proposed a fast single-flux quantum digital circuit technology with a double-wire structure. As shown in Figure 1(b), the double-wire structure consists of two signal lines (representing the signal "1 " and signal "0"), no separate clock signal is required. The two-wire structure solves the difficulties of clock synchronization and sensitivity to clock jitter and skew in traditional fast single-flux quantum digital circuits. However, for the existing Josephson junction superconducting circuit manufacturing process, there are problems of too many junctions and difficult wiring. There is therefore a need for a circuit that is not sensitive to delay, yet has a low number of junctions and is easy to route.

Contents of the invention

The main purpose of the present invention is to provide a general-purpose gate circuit that can be used in a superconducting fast single-flux quantum doublet structure, which reduces the number of Josephson junctions used and makes wiring simpler and more convenient.

The concrete scheme of technical solution problem of the present invention is:

One end of the first connection inductance L1 is the first input end, the other end of the first connection inductance L1 and one end of the second connection inductance L2 are connected to one end of the first Josephson junction J1, and the other end of the first Josephson junction J1 is grounded ; The other end of the second connection inductance L2, one end of the third connection inductance L3 are connected to the output end of the first current source I1, and the ground terminal of the first current source I1 is grounded; the other end of the third connection inductance L3, the first magnetic One end of the pass-through preservation inductance L24 is connected to one end of the second Josephson junction J2, and the other end of the second Josephson junction J2 is grounded; the other end of the first magnetic flux preservation inductance L24 is connected to one end of the third Josephson junction J3;

One end of the fourth connection inductance L4 is the second input end, the other end of the fourth connection inductance L4 and one end of the fifth connection inductance L5 are connected to one end of the fourth Josephson junction J4, and the other end of the fourth Josephson junction J4 is grounded The other end of the fifth connection inductance L5, one end of the sixth connection inductance L6 are connected to the output end of the second current source I2, and the ground terminal of the second current source I2 is grounded; the other end of the sixth connection inductance L6, the second magnetic One end of the pass-through preservation inductance L25 is connected to one end of the fifth Josephson junction J5, and the other end of the fifth Josephson junction J5 is grounded; the other end of the second magnetic flux preservation inductance L25 is connected to one end of the sixth Josephson junction J6;

The other end of the third Josephson junction J3, the other end of the sixth Josephson junction J6, the output end of the third current source I3 are connected to one end of the seventh connection inductance L7, and the ground terminal of the third current source I3 is grounded; the seventh The other end of the connection inductor L7, the output end of the fourth current source I4, one end of the eighth connection inductor L8 is connected to one end of the seventh Josephson junction J7, the ground terminal of the fourth current source I4 is grounded; the eighth connection inductor L8 The other end is connected to one end of the first choke resistor R1, the other end of the first choke resistor R1, the output end of the fifth current source I5, and one end of the eighth Josephson junction J8 are connected to one end of the ninth connection inductor L9, The ground end of the fifth current source I5 is grounded, the other end of the eighth Josephson junction J8 is grounded, and the other end of the ninth connection inductor L9 is the first output end;

One end of the tenth connection inductor L10 is the third input end, the other end of the tenth connection inductor L10, one end of the eleventh connection inductor L11 are connected to one end of the ninth Josephson junction J9, and the other end of the ninth Josephson junction J9 Grounding; the other end of the eleventh connection inductor L11, one end of the twelfth connection inductor L12 are connected to the output end of the sixth current source I6, and the ground end of the sixth current source I6 is grounded; the other end of the twelfth connection inductor L12 1. One end of the third magnetic flux preservation inductance L26 is connected to one end of the tenth Josephson junction J10, and the other end of the tenth Josephson junction J10 is grounded; the other end of the third magnetic flux preservation inductance L26 is connected to the eleventh Josephson junction J11 one end of the connection;

One end of the thirteenth connection inductor L13 is the fourth input end, the other end of the thirteenth connection inductor L13, one end of the fourteenth connection inductor L14 are connected to one end of the twelfth Josephson junction J12, and the twelfth Josephson junction The other end of J12 is grounded; the other end of the fourteenth connection inductor L14 and one end of the fifteenth connection inductor L15 are connected to the output end of the seventh current source I7, and the ground end of the seventh current source I7 is grounded; the fifteenth connection inductor The other end of L15 and one end of the fourth magnetic flux preservation inductance L27 are connected to one end of the thirteenth Josephson junction J13, and the other end of the thirteenth Josephson junction J13 is grounded; the other end of the fourth magnetic flux preservation inductance L27 is connected to the thirteenth Josephson junction J13. Fourteen Josephson junctions are connected at one end of J14;

The other end of the eleventh Josephson junction J11, the other end of the fourteenth Josephson junction J14, the output end of the eighth current source I8 are connected to one end of the sixteenth connection inductor L16, and the ground end of the eighth current source I8 is grounded , the other end of the sixteenth connection inductor L16, the output end of the ninth current source I9, one end of the seventeenth connection inductor L17 are connected to one end of the fifteenth Josephson junction J15, and the ground terminal of the ninth current source I9 is grounded, The other end of the seventeenth connection inductor L17 is connected to one end of the second choke resistor R2, the other end of the second choke resistor R2, the output end of the tenth current source I10, and one end of the sixteenth Josephson junction J16 are connected to the first end of the second choke resistor R2. One end of the eighteenth connection inductor L18 is connected, the ground end of the tenth current source I10 is grounded, the other end of the sixteenth Josephson junction J16 is grounded, and the other end of the eighteenth connection inductor L18 is the second output end.

The other end of the seventh Josephson junction J7 is connected to one end of the nineteenth connection inductor L19, the other end of the nineteenth connection inductor L19, one end of the seventeenth Josephson junction J17, and one end of the twentieth connection inductor L20 are connected to the One end of the twenty-first connection inductor L21 is connected; the other end of the seventeenth Josephson junction J17 is grounded, the other end of the twenty-first connection inductor L20 is connected to the other end of the fifteenth Josephson junction J15, and the twenty-first connection inductor The other end of L21, the output end of the eleventh current source I11 and one end of the twenty-second connection inductor L22, the ground end of the eleventh current source I11 is grounded, the other end of the twenty-second connection inductor L22, the twenty-second One end of the three-connection inductor L23 is connected to one end of the eighteenth Josephson junction J18, the other end of the eighteenth Josephson junction J18 is grounded, and the other end of the twenty-third connection inductor L23 is the third output end.

The advantages that the present invention has:

1. Different combinations of output terminals can realize the functions of AND gate, OR gate, and XOR gate;

2. Compared with the general-purpose gate circuit in the prior art, the number of Josephson junctions used in the circuit is less;

3. Compared with the general-purpose gate circuit in the prior art, the time delay of the signal output of the circuit is smaller;

4. Compared with the general-purpose gate circuit in the prior art, the sequence structure adopted by the circuit makes wiring simpler and more convenient.

Description of drawings

Fig. 1 is a synchronous and two-wire timing schematic diagram of a Josephson logic circuit;

Fig. 2 is a circuit diagram of the present invention;

Fig. 3 (a) is the AND gate that uses the present invention to form;

Fig. 3(b) is an XOR gate constructed using the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 2, one end of the first connection inductance L1 in the present invention is the first input terminal A1, and the other end of the first connection inductance L1 and one end of the second connection inductance L2 are connected to one end of the first Josephson junction J1 , the other end of the first Josephson junction J1 is grounded; the other end of the second connection inductance L2 and one end of the third connection inductance L3 are connected to the output end of the first current source I1, and the ground end of the first current source I1 is grounded; the second The other end of the three-connection inductance L3, one end of the first magnetic flux preservation inductance L24 are connected to one end of the second Josephson junction J2, and the other end of the second Josephson junction J2 is grounded; the other end of the first magnetic flux preservation inductance L24 is connected to the other end of the second Josephson junction J2. One end of the third Josephson junction J3 is connected;

One end of the fourth connection inductance L4 is the second input terminal B1, the other end of the fourth connection inductance L4, one end of the fifth connection inductance L5 are connected to one end of the fourth Josephson junction J4, and the other end of the fourth Josephson junction J4 Grounding; the other end of the fifth connection inductor L5, one end of the sixth connection inductor L6 are connected to the output end of the second current source I2, and the ground end of the second current source I2 is grounded; the other end of the sixth connection inductor L6, the second One end of the magnetic flux preservation inductance L25 is connected to one end of the fifth Josephson junction J5, and the other end of the fifth Josephson junction J5 is grounded; the other end of the second magnetic flux preservation inductance L25 is connected to one end of the sixth Josephson junction J6;

The other end of the third Josephson junction J3, the other end of the sixth Josephson junction J6, the output end of the third current source I3 are connected to one end of the seventh connection inductor L7, the ground end of the third current source I3 is grounded, and the seventh The other end of the inductance L7 is connected, the output end of the fourth current source I4, one end of the eighth connection inductance L8 is connected to one end of the seventh Josephson junction J7, the ground terminal of the fourth current source I4 is grounded, and the eighth connection of the inductance L8 The other end is connected to one end of the first choke resistor R1, the other end of the first choke resistor R1, the output end of the fifth current source I5, and one end of the eighth Josephson junction J8 are connected to one end of the ninth connection inductor L9, The ground end of the fifth current source I5 is grounded, the other end of the eighth Josephson junction J8 is grounded, and the other end of the ninth connection inductor L9 is the first output end A1B1.

One end of the tenth connection inductance L10 is the third input end A0, the other end of the tenth connection inductance L10 and one end of the eleventh connection inductance L11 are connected to one end of the ninth Josephson junction J9, and the other end of the ninth Josephson junction J9 One end is grounded; the other end of the eleventh connection inductor L11, one end of the twelfth connection inductor L12 are connected to the output end of the sixth current source I6, and the ground end of the sixth current source I6 is grounded; the other end of the twelfth connection inductor L12 One end, one end of the third magnetic flux preservation inductance L26 is connected to one end of the tenth Josephson junction J10, and the other end of the tenth Josephson junction J10 is grounded; the other end of the third magnetic flux preservation inductance L26 is connected to the eleventh Josephson junction One end of J11 is connected;

One end of the thirteenth connection inductance L13 is the fourth input terminal B0, the other end of the thirteenth connection inductance L13, one end of the fourteenth connection inductance L14 are connected to one end of the twelfth Josephson junction J12, and the twelfth Josephson junction The other end of the junction J12 is grounded; the other end of the fourteenth connection inductor L14 and one end of the fifteenth connection inductor L15 are connected to the output end of the seventh current source I7, and the ground end of the seventh current source I7 is grounded; the fifteenth connection The other end of the inductance L15 and one end of the fourth magnetic flux preservation inductance L27 are connected to one end of the thirteenth Josephson junction J13, and the other end of the thirteenth Josephson junction J13 is grounded; the other end of the fourth magnetic flux preservation inductance L27 is connected to the One end of the fourteenth Josephson junction J14 is connected;

The other end of the eleventh Josephson junction J11, the other end of the fourteenth Josephson junction J14, the output end of the eighth current source I8 are connected to one end of the sixteenth connection inductor L16, and the ground end of the eighth current source I8 is grounded , the other end of the sixteenth connection inductor L16, the output end of the ninth current source I9, one end of the seventeenth connection inductor L17 are connected to one end of the fifteenth Josephson junction J15, and the ground terminal of the ninth current source I9 is grounded, The other end of the seventeenth connection inductor L17 is connected to one end of the second choke resistor R2, the other end of the second choke resistor R2, the output end of the tenth current source I10, and one end of the sixteenth Josephson junction J16 are connected to the first end of the second choke resistor R2. One end of the eighteenth connection inductor L18 is connected, the ground end of the tenth current source 110 is grounded, the other end of the sixteenth Josephson junction J16 is grounded, and the other end of the eighteenth connection inductor L18 is the second output end A0B0.

The other end of the seventh Josephson junction J7 is connected to one end of the nineteenth connection inductor L19, the other end of the nineteenth connection inductor L19, one end of the seventeenth Josephson junction J17, and one end of the twentieth connection inductor L20 are connected to the One end of the twenty-first connection inductor L21 is connected; the other end of the seventeenth Josephson junction J17 is grounded, the other end of the twenty-first connection inductor L20 is connected to the other end of the fifteenth Josephson junction J15, and the twenty-first connection inductor The other end of L21, the output end of the eleventh current source I11 and one end of the twenty-second connection inductor L22, the ground end of the eleventh current source I11 is grounded, the other end of the twenty-second connection inductor L22, the twenty-second One end of the three-connection inductor L23 is connected to one end of the eighteenth Josephson junction J18, the other end of the eighteenth Josephson junction J18 is grounded, and the other end of the twenty-third connection inductor L23 is the third output terminal A1B0/A0B1.

The circuit contains four Josephson quantum interferometers, namely the first Josephson quantum interferometer (composed of J2, L24, J3, L7, J7, L19, J17), the second Josephson quantum interferometer (composed of J5, L25 , J6, L7, J7, L19, J17), the third Josephson quantum interferometer (composed of J10, L26, J11, L16, J15, L20, J17), the fourth Josephson quantum interferometer (composed of J13, L27 , J14, L16, J15, L20, J17). The seventh Josephson junction J7 and the seventeenth Josephson junction J17 are two serial Josephson junctions shared by the first Josephson quantum interferometer and the second Josephson quantum interferometer connected to the first input terminal A1 and the second input terminal B1. Forest junction, the fifteenth Josephson junction J15 and the seventeenth Josephson junction J17 are two shared by the third Josephson quantum interferometer and the fourth Josephson quantum interferometer connected to the third input terminal A0 and the fourth input terminal B0 A series of Josephson junctions. And the seventeenth Josephson junction J17 is the Josephson junction shared by the first, second, third and fourth Josephson quantum interferometers. When the first input terminal A1 and the second input terminal B1 respectively have a voltage pulse input, respectively causing the first Josephson junction J1 and the fourth Josephson junction J4 to flip, the second Josephson junction J2 and the fifth Josephson junction J5 Flip respectively, at this time the sum of the currents of the first Josephson quantum interference device and the second Josephson quantum interference device is greater than the critical current of the seventh Josephson junction J7 shared by them, and the seventh Josephson junction J7 is reversed, so that the eighth Josephson The Mori junction J8 is reversed, and the first output terminal A1B1 outputs a voltage pulse signal. When the third input terminal A0 and the fourth input terminal B0 are respectively input by a voltage pulse, causing the ninth Josephson junction J9 and the twelfth Josephson junction J12 to flip, the tenth Josephson junction J10 and the thirteenth Josephson junction The junctions J13 are reversed respectively, at this time the sum of the currents of the third Josephson quantum interferometer and the fourth Josephson quantum interference device is greater than the critical current of the fifteenth Josephson junction J15 shared by them, and the fifteenth Josephson junction J15 is reversed, Therefore, the sixteenth Josephson junction J16 inverts the second output terminal A0B0 to output a voltage pulse. When the first input terminal A1 and the fourth input terminal B0 respectively have a voltage pulse input or the second input terminal B1 and the third input terminal A0 respectively have a voltage pulse input, the first Josephson junction J1 and the twelfth Josephson junction are respectively formed. When J12 flips, or when the fourth Josephson junction J4 and the ninth Josephson junction J9 are flipped, the second Josephson junction J2 and the thirteenth Josephson junction J13 are flipped respectively, or the fifth Josephson junction J5 and the tenth Josephson junction are turned over respectively. Mori junction J10 is reversed respectively, and at this time the sum of the currents of the first Josephson quantum interference device and the fourth Josephson quantum interference device or the sum of the currents of the second Josephson quantum interference device and the third Josephson quantum interference device is greater than the tenth With the critical current of the seventh Josephson junction J17, the seventeenth Josephson junction J17 is reversed, and thus the eighteenth Josephson junction J18 is reversed, and the third output terminal A1B0/A0B1 outputs a voltage pulse.

The first choke resistor R1 and the second choke resistor R2 are used to respectively have voltage pulse signal input at the first input terminal A1 and the fourth input terminal B0 or respectively have voltage pulses at the second input terminal B1 and the third input terminal A0 Input, the loop current remaining in the circuit after the seventeenth Josephson junction J17 flips.

Since the Josephson quantum interferometer can maintain a continuous current in it after one end of the Josephson junction is reversed, any two voltage pulse inputs can not arrive at the same time, and in no particular order, thus ensuring that the circuit works in an asynchronous state.

A set of typical values of each component parameter of this circuit is: the value of the first connection inductance L1 is 2 picohenry, the value of the second connection inductance L2 is 1 pichenry, the value of the third connection inductance L3 is 1 pichenry, and the value of the fourth connection inductance L4 The value of the fifth connected inductance L5 is 1 Pihenhen, the value of the sixth connected inductance L6 is 1 Pihenhen, the value of the seventh connected inductance L7 is 0.2 Pihenhen, and the value of the eighth connected inductance L8 is 2 Pihenhen. The value of the ninth connected inductance L9 is 2 pichenhen, the value of the tenth connected inductor L10 is 2 pichenry, the value of the eleventh connected inductor L11 is 1 pichenry, the value of the twelfth connected inductor L12 is 1 pichenry, the value of the thirteenth connected The value of the inductance L13 is 2 pichenhen, the value of the fourteenth connected inductor L14 is 1 pichenhen, the value of the fifteenth connected inductor L15 is 1 pichenhen, the value of the sixteenth connected inductor L16 is 0.2 pichenhen, and the seventeenth connected inductor L17 The value of the eighteenth connected inductance L18 is 2 pichenhen, the nineteenth connected inductance is 0.8 pichenry, the twentieth connected inductance is 0.8 pichenry, and the twenty-first connected inductance is 4 pichenry Heng, the inductance value of the twenty-second connection is 1 pichenhen, the inductance value of the twenty-third connection is 2 pichenhen; the value of the first magnetic flux preservation inductance L24 is 7.9 pichenhen, and the value of the second flux preservation inductance L25 is 7.9 pichenhen Heng, the value of the third magnetic flux preservation inductance L26 is 7.9 picohenry, the value of the fourth magnetic flux preservation inductance L27 is 7.9 pichenry; the value of the first choke resistance R1 is 1.53 ohms, and the value of the second choke resistance R2 is 1.53 ohms; The critical current value of the first Josephson junction J1 is 250 microamps, the critical current value of the second Josephson junction J2 is 250 microamps, the critical current value of the third Josephson junction J3 is 125 microamps, and the fourth Josephson junction The critical current value of J4 is 250 microamperes, the critical current value of the fifth Josephson junction J5 is 250 microamperes, the critical current value of the sixth Josephson junction J6 is 125 microamperes, and the critical current value of the seventh Josephson junction J7 is 130 microamperes, the critical current value of the eighth Josephson junction J8 is 213 microamperes, the critical current value of the ninth Josephson junction J9 is 250 microamperes, and the critical current value of the tenth Josephson junction J10 is 250 microamperes, The critical current value of the eleventh Josephson junction J11 is 125 microamperes, the critical current value of the twelfth Josephson junction J12 is 250 microamperes, the critical current value of the thirteenth Josephson junction J13 is 250 microamperes, and the tenth Josephson junction J13 has a critical current value of 250 microamperes. The critical current value of the four Josephson junction J14 is 125 microamperes, the critical current value of the fifteenth Josephson junction J15 is 130 microamperes, the critical current value of the sixteenth Josephson junction J16 is 213 microamperes, and the seventeenth Josephson junction J16 is 213 microamperes. The critical current value of the Mori junction J17 is 200 microamperes, the critical current value of the eighteenth Josephson junction J18 is 250 microamperes; the value of the first current source I1 is 230 microamperes, and the value of the second current source I2 is 230 microamperes An, the value of the third current source I3 is 20 microamps, the value of the fourth current source I4 is 32 microamps, the value of the fifth current source I5 is 285 microamps, and the value of the sixth current source I6 is 230 microamps, The value of the seventh current source I7 is 230 microamperes, the eighth current source I The value of 8 is 20 microamps, the value of the ninth current source I9 is 32 microamps, the value of the tenth current source I10 is 285 microamps, and the value of the eleventh current source I11 is 300 microamps.

As shown in Figure 3 (a), the second output terminal A0B0 of the present invention is connected to one input terminal of the combiner, and the third output terminal A1B0/A0B1 is connected to the other input terminal of the combiner to form an AND gate circuit. The first output terminal A1B1 of the circuit in FIG. 2 is the first output terminal of the AND gate, and the output is AB, and the output terminal of the combiner is the second output terminal of the AND gate, and the output is AB.

As shown in Figure 3(b), the first output terminal A1B1 of the present invention is connected to one input terminal of the combiner, and the second output terminal A0B0 is connected to the other input terminal of the combiner to form an exclusive OR gate circuit . The third output terminal A1B0/A0B1 of the circuit in Figure 2 is the first output terminal of the XOR gate, and the output is $A\⊕B,$ The output terminal of the combiner is the second output terminal of the XOR gate, and the output is $\stackrel{\‾}{A\⊕B}.$

Claims (1)

1. resistive superconductive asynchronous bilinear logic universal gate circuit, it is characterized in that: first end that connects inductance L 1 is a first input end, first other end, second end that connects inductance L 2 that connects inductance L 1 is connected the other end ground connection of the first Josephson junction J1 with the end of the first Josephson junction J1; Second other end, the 3rd end that connects inductance L 3 that connects inductance L 2 is connected the earth terminal ground connection of the first current source I1 with the output of the first current source I1; The end that the other end of the 3rd connection inductance L 3, first magnetic flux are preserved inductance L 24 is connected the other end ground connection of the second Josephson junction J2 with the end of the second Josephson junction J2; The other end that first magnetic flux is preserved inductance L 24 is connected with the end of the 3rd Josephson junction J3;

The 4th end that connects inductance L 4 is second input, and the 4th other end, the 5th end that connects inductance L 5 that connects inductance L 4 is connected the other end ground connection of the 4th Josephson junction J4 with the end of the 4th Josephson junction J4; The 5th other end, the 6th end that connects inductance L 6 that connects inductance L 5 is connected the earth terminal ground connection of the second current source I2 with the output of the second current source I2; The end that the other end of the 6th connection inductance L 6, second magnetic flux are preserved inductance L 25 is connected the other end ground connection of the 5th Josephson junction J5 with the end of the 5th Josephson junction J5; The other end that second magnetic flux is preserved inductance L 25 is connected with the end of the 6th Josephson junction J6;

The output of the other end of the other end of the 3rd Josephson junction J3, the 6th Josephson junction J6, the 3rd current source I3 is connected inductance L 7 with the 7th a end connects the earth terminal ground connection of the 3rd current source I3; The 7th other end, the output of the 4th current source I4, the 8th end that connects inductance L 8 that connects inductance L 7 is connected the earth terminal ground connection of the 4th current source I4 with the end of the 7th Josephson junction J7; The 8th other end that connects inductance L 8 is connected with the end of the first choking resistance R1, the end of the output of the other end of the first choking resistance R1, the 5th current source I5, the 8th Josephson junction J8 is connected inductance L 9 with the 9th a end connects, the earth terminal ground connection of the 5th current source I5, the other end ground connection of the 8th Josephson junction J8, the 9th other end that connects inductance L 9 is first output;

The tenth end that connects inductance L 10 is the 3rd input, and the tenth other end, the 11 end that connects inductance L 11 that connects inductance L 10 is connected the other end ground connection of the 9th Josephson junction J9 with the end of the 9th Josephson junction J9; The 11 other end, the 12 end that connects inductance L 12 that connects inductance L 11 is connected the earth terminal ground connection of the 6th current source I6 with the output of the 6th current source I6; The end that the other end of the 12 connection inductance L 12, the 3rd magnetic flux are preserved inductance L 26 is connected the other end ground connection of the tenth Josephson junction J10 with the end of the tenth Josephson junction J10; The other end that the 3rd magnetic flux is preserved inductance L 26 is connected with the end of the 11 Josephson junction J11;

The 13 end that connects inductance L 13 is a four-input terminal, and the 13 other end, the 14 end that connects inductance L 14 that connects inductance L 13 is connected the other end ground connection of the 12 Josephson junction J12 with the end of the 12 Josephson junction J12; The 14 other end, the 15 end that connects inductance L 15 that connects inductance L 14 is connected the earth terminal ground connection of the 7th current source I7 with the output of the 7th current source I7; The end that the other end of the 15 connection inductance L 15, the 4th magnetic flux are preserved inductance L 27 is connected the other end ground connection of the 13 Josephson junction J13 with the end of the 13 Josephson junction J13; The other end that the 4th magnetic flux is preserved inductance L 27 is connected with the end of the 14 Josephson junction J14;

The other end of the 11 Josephson junction J11, the other end of the 14 Josephson junction J14, the end that the output and the 16 of the 8th current source I8 is connected inductance L 16 connects, the earth terminal ground connection of the 8th current source I8, the 16 connects the other end of inductance L 16, the output of the 9th current source I9, the 17 end that connects inductance L 17 is connected with the end of the 15 Josephson junction J15, the earth terminal ground connection of the 9th current source I9, the 17 other end that connects inductance L 17 is connected with the end of the second choking resistance R2, the other end of the second choking resistance R2, the output of the tenth current source I10, the end of the 16 Josephson junction J16 is connected inductance L 18 with the 18 a end connects, the earth terminal ground connection of the tenth current source I10, the other end ground connection of the 16 Josephson junction J16, the 18 other end that connects inductance L 18 is second output;

The end that the other end and the 19 of the 7th Josephson junction J7 is connected inductance L 19 connects, and the 19 connects the other end of inductance L 19, the end of the 17 Josephson junction J17, the 20 end that connects inductance L 20 is connected inductance L 21 with the 21 end connection; The other end ground connection of the 17 Josephson junction J17, the 20 other end that connects inductance L 20 is connected with the other end of the 15 Josephson junction J15, the 21 connects the other end of inductance L 21, the end that the output and the 22 of the 11 current source I11 is connected inductance L 22 connects, the earth terminal ground connection of the 11 current source I11, the 22 connects the other end of inductance L 22, one end of the 23 connection inductance L 23 and the end of the 18 Josephson junction J18 are connected, the other end ground connection of the 18 Josephson junction J18, the 23 other end that connects inductance L 23 is the 3rd output.

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