Incorporating arrays of josephson junctions in a josephson junction ring modulator in a josephson parametric converter

Patent metadata

Field	Value
Publication number	US-10276771-B2
Application number	US-201816002659-A
Country	US
Kind code	B2
Filing date	Jun 7, 2018
Priority date	Jun 29, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A Josephson parametric converter is provided. The Josephson parametric converter includes a multi-Josephson junction ring modulator having arrays of Josephson junctions arranged in a ring configuration with nodes inter-dispersed between the arrays. The Josephson parametric converter includes resonators formed from capacitors that shunt the multi-Josephson junction ring modulator and enable respective modes of the Josephson parametric converter.

First claim

What is claimed is:

1. A Josephson parametric converter, comprising:
a multi-Josephson junction ring modulator having arrays of Josephson junctions arranged in a ring configuration with nodes inter-dispersed between the arrays; and
resonators formed from capacitors that shunt the multi-Josephson junction ring modulator and enable respective modes of the Josephson parametric converter.

2. The Josephson parametric converter of claim 1 , wherein the Josephson junctions in each of the arrays are connected in series.

3. The Josephson parametric converter of claim 1 , wherein the resonators comprise a first and a second resonator, the first resonator comprising at least one of the capacitors shunted across a first node and a third node from among the nodes, and the second resonator comprising at least another one of the capacitors shunted across a second node and a fourth node from among the nodes.

4. The Josephson parametric converter of claim 3 , wherein multi-Josephson junction ring modulator has two opposing pairs of nodes, a first of the two opposing pairs of nodes formed from the first node and the third node, and a second of the two opposing pairs of nodes formed from the second node and the fourth node.

5. The Josephson parametric converter of claim 1 , further comprising a first, a second, a third, and a fourth coupling capacitor, each having a first electrode connected to a respective different one of the nodes of the multi-Josephson junction ring modulator, and having a second electrode for connecting to a respective one of a plurality of feedlines.

6. The Josephson parametric converter of claim 1 , wherein the Josephson parametric converter is formed such that a total inductance of the Josephson parametric converter is dominated by an inductance contribution of the multi-Josephson junction ring modulator to provide a dynamical bandwidth of at least 100 MHz for the Josephson parametric converter at 20 dB of gain.

7. The Josephson parametric converter of claim 1 , wherein the resonators are further formed from lumped-element inductance, and wherein the arrays of Josephson junctions in the Josephson junction ring modulator in conjunction with using a lumped-element implementation for the resonators enables a maximum input power of at least −120 dBm at 20 dB of gain for the Josephson parametric converter, wherein the lumped-element implementation for the resonators comprises the lumped-element inductance and the capacitors implemented as lumped-element capacitors.

8. The Josephson parametric converter of claim 1 , wherein a number of the nodes in the ring arrangement is four.

9. The Josephson parametric converter of claim 1 , wherein the Josephson parametric converter is configured to perform wave mixing of three microwave signals for quantum information processing.

10. The Josephson parametric converter of claim 9 , wherein the Josephson parametric converter is configured to selectively perform unitary frequency conversion or quantum-limited amplification in a microwave domain based on a pump tone frequency.

11. A method, comprising:
forming a Josephson parametric converter, wherein said forming step includes:
forming a multi-Josephson junction ring modulator having arrays of Josephson junctions arranged in a ring configuration with nodes inter-dispersed between the arrays; and
forming resonators from capacitors that shunt the multi-Josephson junction ring modulator and enable respective modes of the Josephson parametric converter.

12. The method of claim 11 , wherein the Josephson junctions in each of the arrays are connected in series.

13. The method of claim 11 , wherein forming the resonators comprises:
shunting at least one of the capacitors across a first node and a third node from among the nodes; and
shunting at least another one of the capacitors across a second node and a fourth node from among the nodes.

14. The method of claim 13 , wherein multi-Josephson junction ring modulator is formed to have two opposing pairs of nodes, a first of the two opposing pairs of nodes formed from the first node and the third node, and a second of the two opposing pairs of nodes formed from the second node and the fourth node.

15. The method of claim 11 , further comprising forming a first, a second, a third, and a fourth coupling capacitor, each having a first electrode connected to a respective different one of the nodes of the multi-Josephson junction ring modulator, and having a second electrode for connecting to a respective one of a plurality of feedlines.

16. The method of claim 11 , wherein the Josephson parametric converter is formed such that a total inductance of the Josephson parametric converter is dominated by an inductance contribution of the multi-Josephson junction ring modulator to provide a dynamical bandwidth of at least 100 MHz for the Josephson parametric converter.

17. The method of claim 11 wherein the first and the second resonator are further formed from lumped-element inductance, and wherein the arrays of Josephson junctions in the Josephson junction ring modulator in conjunction with using a lumped-element implementation for the resonators enables a maximum input power of at least −120 dBm at 20 dB of gain for the Josephson parametric converter, wherein the lumped-element implementation for the resonators comprises the lumped-element inductance and the capacitors implemented as lumped-element capacitors.

18. The method of claim 11 , wherein a number of the nodes in the ring arrangement is four.

19. The method of claim 11 , wherein the Josephson parametric converter is configured to perform wave mixing of three input waves for quantum information processing.

20. The method of claim 19 , wherein the Josephson parametric converter is configured to selectively perform unitary frequency conversion or quantum-limited amplification in a microwave domain based on a pump tone frequency.

Assignees

• IBM

Inventors

• Abdo Baleegh

Classifications

• H01L39/2493

  Electricity · mapped topic

• H01L39/223

  Electricity · mapped topic

• H01L39/045

  Electricity · mapped topic

• H01L39/025 Primary

  Electricity · mapped topic

• B82Y10/00

  Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic · CPC title