Superconducting Coupler with Exponentially Large On:Off Ratio

Journal Article · 26 December 2021 · Physical Review Applied

DOI: https://doi.org/10.1103/physrevapplied.16.064062 · OSTI ID:1982760

Leroux, Catherine ^[1]; Di Paolo, Agustin  ^[1]; Blais, Alexandre  ^[2]

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1. Univ. of Sherbrooke, QC (Canada)
2. Univ. of Sherbrooke, QC (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)

Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. However, most couplers achieve this by fine tuning circuit parameters and often target specific couplings, such as the spurious ZZ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on:off ratio and without the need for fine tuning. Our approach is based on a bus mode supplemented by an ancillary nonlinear resonator mode. Driving the ancillary mode leads to a coupler-state-dependent field displacement in the resonator that, in turn, results in an exponential suppression of real and virtual two-qubit interactions with respect to the drive power. A superconducting circuit implementation supporting the proposed mechanism is presented.

• Research Organization: National Quantum Information Science (QIS) Research Centers (United States). Quantum Systems Accelerator (QSA)
• Sponsoring Organization: US Army Research Office (ARO); USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1982760
• Journal Information: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 16; ISSN 2331-7019
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English