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A Qubit Chose Which Way the Resonator Squeezed
Refocusing suppressed slow unwanted terms in a proposed superconducting gate and pushed optimistic simulated encoding fidelity above 0.99.
Summary
Refocusing suppressed slow unwanted terms in a proposed superconducting gate and pushed optimistic simulated encoding fidelity above 0.99.
The proposed conditional-squeezing gate drives a SQUID-terminated resonator along a direction set by a dispersively coupled qubit. A refocusing sequence suppresses slowly varying unwanted terms during state-dependent parametric resonance. The authors use the gate to encode arbitrary qubit states into superpositions of one- and two-mode squeezed resonator states whose parity can reveal errors. Under experimentally optimistic nonlinearities and decay rates, simulated encoding fidelity exceeded 0.99. Kerr nonlinearities and dissipation remain the limiting mechanisms, and the work presents an implementation route rather than a reported hardware demonstration.
Why it matters
Refocusing suppressed slow unwanted terms in a proposed superconducting gate and pushed optimistic simulated encoding fidelity above 0.99.
Limits and context
- Kerr nonlinearities and dissipation remain the limiting mechanisms, and the work presents an implementation route rather than a reported hardware demonstration.
Key claims
Refocusing suppressed slow unwanted terms in a proposed superconducting gate and pushed optimistic simulated encoding fidelity above 0.99.
Qualification: Kerr nonlinearities and dissipation remain the limiting mechanisms, and the work presents an implementation route rather than a reported hardware demonstration.
Evidence: source-2026-09-13-014
Sources
- arXiv preprint 2609.10655arXiv · primary research
Corrections
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