# US 2018/0323364 A1 · Isolator based on nondegenerate three-waving mixing josephson devices

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- Number: US 2018/0323364 A1
- Document ID: US20180323364A1
- Status: Published application
- Kind: A1
- Application number: 15/813,964
- Filed: 2017-11-15
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: International Business Machines Corporation
- Applicants: International Business Machines Corporation
- Inventors: Baleegh ABDO
- Web page: https://patentgrep.com/patent/US20180323364A1

## CPC

- H10N 60/805: {for Josephson-effect devices}
- H01P 1/36: Isolators
- H10N 60/0912: {of Josephson-effect devices}
- H10N 60/12: Josephson-effect devices
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A technique relates to a superconducting device. A gyrator includes a first mixing device coupled to a second mixing device. A lumped-element resistor is connected in parallel to the gyrator.

## Claims

### Claim 1

A method of forming a superconducting device comprising:
forming a gyrator including a first mixing device coupled to a second mixing device; and
coupling a lumped-element resistor in parallel to the gyrator.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first mixing device is coupled to the second mixing device via a delay line.

### Claim 3 (depends on 2)

The method of claim 2, wherein the delay line is configured to cause a predefined phase shift.

### Claim 4 (depends on 3)

The method of claim 3, wherein the predefined phase shift adds 90 degrees.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first mixing device coupled to the second mixing device is configured to cause a non-reciprocal phase shift.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first mixing device coupled to the second mixing device is configured to cause a first predefined phase shift in a first direction and a second predefined phase shift in a second direction.

### Claim 7 (depends on 6)

The method of claim 6, wherein the first predefined phase shift is 0 degrees.

### Claim 8 (depends on 6)

The method of claim 6, wherein the second predefined phase shift is 180 degrees.

### Claim 9 (depends on 1)

The method of claim 1, wherein the first and second mixing devices are superconducting three-wave mixing devices.

### Claim 10 (depends on 1)

The method of claim 1, wherein the gyrator and the lumped-element resistor form a superconducting isolator.

### Claim 11

A method of fabricating a superconducting device comprising:
providing a first mixing device having a first mixing port and a second mixing port and a second mixing device having another first mixing port and another second mixing port, the first and second mixing devices being superconducting three-wave mixing devices;
coupling the second mixing port and the another second mixing port together via a delay line to form a gyrator; and
coupling a lumped-element resistor in parallel to the gyrator.

### Claim 12

A method of operating a superconducting isolator comprising:
receiving a signal at a first mixing device coupled to a second mixing device, the first and second mixing devices being coupled in parallel to a lumped-element resistor; and
outputting the signal from the second mixing device, wherein any signal received at the second mixing device is blocked from being output from the first mixing device.