Y. M. Galperin et al 2005 Europhys. Lett. 71 21 doi:10.1209/epl/i2005-10053-y
Y. M. Galperin1,2,3, D. V. Shantsev1,2, J. Bergli4 and B. L. Altshuler4,5
Show affiliationsThe problem of Rabi oscillations in a qubit coupled to a fluctuator and in contact with a heath bath is considered. A scheme is developed for taking into account both phase and energy relaxation in a phenomenological way, while taking full account of the quantum dynamics of the four-level system subject to a driving AC field. Significant suppression of the Rabi oscillations is found when the qubit and fluctuator are close to resonance. The effect of the fluctuator state on the read-out signal is discussed. This effect is shown to modify the observed signal significantly. This may be relevant to recent experiments by Simmonds et al. (Phys. Rev. Lett. 93 (2004) 077003).
03.67.Lx Quantum computation architectures and implementations
03.65.Yz Decoherence; open systems; quantum statistical methods
Issue 1 (July 2005)
Received 27 April 2005, accepted for publication 29 April 2005
Published 27 May 2005
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