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中国物理B：英文版

Collapse and revival of a single-Cooper-pair box in a single-mode quantized field

姚延荪, 邹健, 邵彬

Published Mar 16, 2005• 0 citations
Publisher

Abstract

We study the quantum dynamics of a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field.We demonstrate that under weak damping of the quantized field.the collapse-revival phenomena can exist in this system.and the oscillations of the collapse and revival depend sensitively on the initial state of the single-mode quantized field and the damping rate,π .we also demonstrate that this system can show the beats phenomena.

DOI
10.1088/1009-1963/12/6/014

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We study the quantum dynamics of a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field.We demonstrate that under weak damping of the quantized field.the collapse-revival phenomena can exist in this system.and the oscillations of the collapse and revival depend sensitively on the initial state of the single-mode quantized field and the damping rate,π .we also demonstrate that this system can show the beats phenomena.
We consider a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field. We assume that the box is initially in a mixed state, and investigate the quantum dynamics of the Cooper-pair box and show that the collapse and revival phenomenon can exist in this system. We also study the quantum entropy of the single-Cooper-pair box and discuss the effects of the different parameters on this quantum entropy. We find that the box, which is initially in a mixed state, may evolve into an almost pure state.