Josephson nonlinear circuit
US11791818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2020 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Jun 30, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N60/805
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Parametrically pumped four-wave mixing is a key building block for many developments in the field of superconducting quantum information processing. However, undesired frequency shifts such as Kerr, cross-Ken and Stark shifts inherent with four-wave mixing, lead to difficulties in tuning up the desired parametric processes and, for certain applications, severely limit the fidelities of the resulting operations. Some embodiments include a Josephson four-wave mixing device consisting of a SQUID transmon coupled to a half-flux biased SNAIL transmon, a.k.a. capacitively shunted flux qubit. When the two transmon have matching frequencies, an interference effect cancels the negative Kerr of the SQUID transmon with the positive Kerr of the SNAIL transmon while preserving parametric four-wave mixing capabilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.