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arXiv · 1003.0142

Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

M. D. Reed·B. R. Johnson·A. A. Houck·L. DiCarlo·J. M. Chow·D. I. Schuster·L. Frunzio·R. J. Schoelkopf
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Abstract

Spontaneous emission through a coupled cavity can be a significant decay channel for qubits in circuit quantum electrodynamics. We present a circuit design that effectively eliminates spontaneous emission due to the Purcell effect while maintaining strong coupling to a low-Q cavity. Excellent agreement over a wide range in frequency is found between measured qubit relaxation times and the predictions of a circuit model. Using fast (nanosecond time-scale) flux biasing of the qubit, we demonstrate in situ control of qubit lifetime over a factor of 50. We realize qubit reset with 99.9% fidelity in 120 ns.

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M. D. Reed, B. R. Johnson, A. A. Houck, L. DiCarlo, J. M. Chow, D. I. Schuster, L. Frunzio, R. J. Schoelkopf. 2010-05-31. Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit. https://doi.org/10.1063/1.3435463

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