Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3435463
Keywords
quantum communication; quantum computing; quantum electrodynamics; quantum optics; spontaneous emission
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Funding
- LPS/NSA under ARO [W911NF-05-1-0365]
- NSF [DMR-0653377, DMR-0603369]
- CNR-Istituto di Cibernetica, Pozzuoli, Italy
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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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3435463]
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