Josephson-coupled resonator amplifier (JRA)

Patent metadata

Field	Value
Publication number	US-10097143-B2
Application number	US-201514754315-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jun 29, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A Josephson-coupled resonator amplifier is provided. The Josephson-coupled resonator amplifier includes a first and a second resonator, each formed from respective lumped-element capacitance and respective lumped-element inductance. The Josephson-coupled resonator amplifier further includes one or more Josephson junctions coupling the first resonator to the second resonator, whereby a superconducting loop is formed from at least the lumped-element inductance of the resonators and the one or more Josephson junctions.

First claim

What is claimed is:

1. An apparatus, comprising:
a Josephson-coupled resonator amplifier, including:
a first and a second resonator, each formed from respective lumped-element capacitance and respective lumped-element inductance; and
one or more Josephson junctions coupling the first resonator to the second resonator, whereby a superconducting loop is formed from at least the lumped-element inductance of the resonators and one or more Josephson junctions.

2. The apparatus of claim 1 , wherein the first and second resonators have at least one of different resonance frequencies and different impedances.

3. The apparatus of claim 1 , wherein the lumped-element inductance forming each of the resonators comprises one or more Josephson junctions, wherein the first resonator comprises at least a first capacitor and the second resonator comprises at least a second capacitor, and wherein the one or more Josephson junctions in the first resonator are arranged in parallel with respect to the first capacitor and the one or more Josephson junctions in the second resonator are arranged in parallel with respect to the second capacitor.

4. The apparatus of claim 1 , further comprising:
a first capacitor having a first end connected to the first resonator and a second end for connecting to a transmission line; and
a second capacitor having a first end connected to the second resonator and a second end for connecting to another transmission line,
wherein the first and second capacitors are lumped-element capacitors.

5. The apparatus of claim 1 , further comprising:
a first pair of capacitors, each having a first end connected to a respective node of the first resonator; and
a second pair of capacitors having a first end connected to a respective node of the second resonator,
wherein each of the capacitors in the first pair and the second pair have a second end for connecting to a respective port of at least one 180 hybrid coupler, and wherein the first and second pair of capacitors are lumped-elements capacitors.

6. The apparatus of claim 1 , wherein the one or more Josephson junctions are arranged in series and have a first end and a second end, and the Josephson-coupled resonator amplifier further comprises:
a first pump drive coupling capacitor having a first end connected to the first end of the one or more Josephson junctions and a second end for connecting to one of a center conductor or an outer conductor of a transmission line carrying the pump drive; and
a second pump drive coupling capacitor having a first end connected to the second end of the one or more Josephson junctions and a second end for connecting to another one of the center conductor and the outer conductor of the transmission line carrying the pump drive;
wherein the first and second capacitors are lumped-element capacitors.

7. The apparatus of claim 1 , wherein ports of the Josephson-coupled resonator amplifier are disposed at different on-chip locations.

8. The apparatus of claim 1 , wherein the Josephson-coupled resonator amplifier is configured to have two spatial microwave ports for carrying incoming and outgoing signals from and to the amplifier and one additional spatial port for supplying a microwave pump drive to the amplifier.

9. The apparatus of claim 1 , wherein the Josephson-coupled resonator amplifier is configured to perform three-wave mixing for quantum information processing.

10. An apparatus, comprising:
a Josephson-coupled resonator amplifier including:
a first and a second resonator, each formed from respective lumped-element capacitance and inductances of one or more direct current superconducting quantum interference devices; and
one or more Josephson junctions coupling the first resonator to the second resonator, whereby a superconducting loop is formed from at least the inductances of the direct current superconducting quantum interference devices and the one or more Josephson junctions.

11. The apparatus of claim 10 , wherein the first resonator comprises at least a first capacitor and the second resonator comprises at least a second capacitor, and wherein the one or more direct current superconducting quantum interference devices in the first resonator are arranged in parallel with respect to the first capacitor and the one or more direct current superconducting quantum interference devices in the second resonator are arranged in parallel with respect to the second capacitor.

12. The apparatus of claim 10 , wherein the first and second resonators have at least one of different resonance frequencies and different impedances.

13. The apparatus of claim 10 , wherein the Josephson-coupled resonator amplifier is configured to have two spatial microwave ports for carrying incoming and outgoing signals from and to the amplifier and one additional spatial port for supplying a microwave pump drive to the amplifier.

14. The apparatus of claim 10 , wherein a bandwidth of the Josephson-coupled resonator amplifier is selectably tunable using magnetic flux applied to the direct current superconducting quantum interference devices.

15. A method, comprising:
forming a Josephson-coupled resonator amplifier, wherein said forming step includes:
forming a first and a second resonator from respective lumped-element inductances and capacitances; and
forming one or more Josephson Junctions connecting the first resonator to the second resonator, whereby a superconducting loop is formed from at least the inductances of the first and second resonators and the one or more Josephson junctions.

16. The method of claim 15 , wherein the first and second resonators are formed to have at least one of different resonance frequencies and different impedances.

17. The method of claim 15 , wherein the inductances of the first and second resonators are formed to comprise one or more direct current superconducting quantum interference devices.

18. The method of claim 17 , further comprising selectably tuning a bandwidth of the Josephson-coupled resonator amplifier using magnetic flux applied to the direct current superconducting quantum interference devices.

19. The method of claim 15 , wherein the inductances of the first and second resonators are each formed to comprise at least one respective Josephson Junction.

20. The method of claim 15 , wherein ports of the Josephson-coupled resonator amplifier are disposed at different on-chip locations.

Assignees

• IBM

Inventors

• Abdo Baleegh

Classifications

• G06N99/002

  Physics · mapped topic

• H03F19/00

  Amplifiers using superconductivity effects · CPC title

• H03F15/00

  Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect · CPC title

• H03F1/42 Primary

  Modifications of amplifiers to extend the bandwidth · CPC title