Relaxation and decoherence in a resonantly driven qubit

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dc.creatorZhou, Zhongyuan
dc.creatorChu, Shih-I
dc.creatorHan, Siyuan
dc.date2006-04-07
dc.date2007-05-08
dc.date.accessioned2026-07-07T07:59:51Z
dc.date.available2026-07-07T07:59:51Z
dc.descriptionRelaxation and decoherence of a qubit coupled to environment and driven by a resonant ac field are investigated by analytically solving Bloch equation of the qubit. It is found that the decoherence of a driven qubit can be decomposed into intrinsic and field-dependent ones. The intrinsic decoherence time equals to the decoherence time of the qubit in free decay while the field-dependent decoherence time is identical with the relaxation time of the qubit in driven oscillation. Analytical expressions of the relaxation and decoherence times are derived and applied to study a microwave-driven SQUID flux qubit. The results are in excellent agreement with those obtained by numerically solving the master equation. The relations between the relaxation and decoherence times of a qubit in free decay and driven oscillation can be used to extract the decoherence and thus dephasing times of the qubit by measuring its population evolution in free decay and resonantly driven oscillation.
dc.description2 table and 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0604191
dc.identifierhttp://arxiv.org/abs/cond-mat/0604191
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/128522
dc.subjectOther Condensed Matter
dc.subjectSuperconductivity
dc.titleRelaxation and decoherence in a resonantly driven qubit
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