Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

Details Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

2010-02-28

arxiv.org/abs/1003.0142v2

Appl. Phys. Lett. 96, 203110 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1063/1.3435463

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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