Superconducting nonlinear asymmetric inductive element and related systems and methods

Patent metadata

Field	Value
Publication number	US-11737376-B2
Application number	US-201816770942-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 11, 2017
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A superconducting device includes two nodes and a Josephson junction coupled between the two nodes, wherein the Josephson junction is characterized by a superconducting phase difference, φ, wherein the superconducting device has a potential that varies as a function of the superconducting phase difference, φ, and has a single potential well. The potential has a non-zero cubic term and quartic term is zero. The Josephson junction may be a single small Josephson junction. The superconducting device may include a superconducting ring connected between the two nodes. The superconducting ring may include a first ring portion with a plurality of large Josephson junctions connected in series. The superconducting ring may also include a second ring portion that includes the single small Josephson junction in parallel with the plurality of large Josephson junctions between the two nodes.

First claim

What is claimed is:

1. A superconducting device comprising:
two nodes; and
a Josephson junction coupled between the two nodes, wherein the Josephson junction is characterized by a superconducting phase difference, φ wherein the superconducting device has a potential that varies as a function of the superconducting phase difference, φ and has a single potential well, wherein the potential has a non-zero φ 3 term and a φ 4 term that is equal to zero.

2. The superconducting device of claim 1 , wherein the Josephson junction is a first Josephson junction and the superconducting device further comprises:
a superconducting ring connected between the two nodes, the superconducting ring comprising:
a first ring portion comprising a plurality of second Josephson junctions connected in series, wherein each second Josephson junction of the plurality of second Josephson junctions has the same tunneling energy; and
a second ring portion comprising the first Josephson junction in parallel with the plurality of second Josephson junctions between the two nodes.

3. The superconducting device of claim 2 , further comprising a magnetic flux generation device positioned in proximity to the superconducting ring and configured to generate an external DC magnetic flux through the superconducting ring.

4. The superconducting device of claim 3 , wherein the plurality of second Josephson junctions consists of three second Josephson junctions.

5. The superconducting device of claim 4 , wherein the three second Josephson junctions are formed from two Dolan bridges.

6. The superconducting device of claim 4 , wherein a tunneling energy of the first Josephson junction is less than a tunneling energy of each of the second Josephson junctions.

7. The superconducting device of claim 6 , wherein the tunneling energy of each second Josephson junction is E J , and the tunneling energy of the first Josephson junction is αE J , where α is less than 0.50 and greater than 0.20.

8. The superconducting device of claim 7 , wherein α is approximately equal to 0.29 and the external DC magnetic flux is 0.41Φ 0 , where (Φ 0 is the magnetic flux quantum.

Assignees

• Univ Yale

Inventors

• Frattini Nicholas
• Vool Uri
• Shankar Shyam
• Narla Anirudh
• Sliwa Katrina
• Devoret Michel
• Sivak Volodymyr

Classifications

• G06N10/40

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title

• H10N60/805 Primary

  for Josephson-effect devices · CPC title

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title

• H10N60/12

  Josephson-effect devices · CPC title

• H10N69/00

  Integrated devices, or assemblies of multiple devices, comprising at least one superconducting element covered by group H10N60/00 · CPC title