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Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

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arxiv 1003.0142 v2 pith:DY7WKWOS submitted 2010-02-28 cond-mat.mes-hall cond-mat.supr-con

classification cond-mat.mes-hallcond-mat.supr-con
keywords qubitcircuitemissionspontaneouscavityfastresetagreement
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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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  1. Quantum bits with Josephson junctions

    quant-ph 2019-08 unverdicted

    A review chapter explaining how Josephson junctions are used to build quantum bits, their circuits, and their applications to quantum computing and quantum optics.

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