Multi-path interferometric josephson isolator based on nondegenerate three-wave mixing josephson devices

A method to form a microwave isolator device, the method comprising:

• configuring a first nondegenerate microwave mixer device (first mixer) having a first port and a second port, the first mixer configured to receive a microwave input of an input frequency via a first port, and further configured to generate an idler signal of an idler frequency at a second port;
• configuring a second nondegenerate microwave mixer device (second mixer) having a different first port and a different second port, the second mixer configured to receive the microwave input of the input frequency via a different first port, and to generate the idler signal of the idler frequency at a different second port;
• coupling a first input/output (I/O) port to the first port and the different first port;
• and
• coupling a second I/O port to the first port and the different first port, wherein a microwave signal (signal) communicated between the first I/O port and the second I/O port is transmitted while propagating in a first direction between the first I/O port to the second I/O port through the first mixer and the second mixer and to be blocked while propagating in a second direction between the second I/O port to the first I/O through the first mixer and the second mixer.

A superconductor fabrication system which when operated to fabricate a microwave isolator device performing operations comprising:

• configuring a first nondegenerate microwave mixer device (first mixer) having a first port and a second port, the first mixer configured to receive a microwave input of an input frequency via a first port, and further configured to generate an idler signal of an idler frequency at a second port;
• configuring a second nondegenerate microwave mixer device (second mixer) having a different first port and a different second port, the second mixer configured to receive the microwave input of the input frequency via a different first port, and to generate the idler signal of the idler frequency at a different second port;
• coupling a first input/output (I/O) port to the first port and the different first port;
• and
• coupling a second I/O port to the first port and the different first port, wherein a microwave signal (signal) communicated between the first I/O port and the second I/O port is transmitted while propagating in a first direction between the first I/O port to the second I/O port through the first mixer and the second mixer and to be blocked while propagating in a second direction between the second I/O port to the first I/O through the first mixer and the second mixer.