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arXiv quant-ph/0409053quant-ph
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有耗腔中电荷量子比特退相干的非线性机制:准简正模方法

A nonlinear mechanism of charge qubit decoherence in a lossy cavity: the quasi normal mode approach

Y. B. Gao, Y. D. Wang, C. P. Sun

摘要:

从准简正模的观点出发,描述了有耗微腔中约瑟夫森结(JJ)电荷量子比特的一种新的退相干机制,这种退相干机制可以在基于JJ量子比特的量子计算的实际实验中出现.研究表明,电荷量子比特与量子腔场的非线性耦合会导致共振模的额外耗散,这是由于电荷量子比特自身诱导的共振模与非共振模之间的有效相互作用.利用系统加浴法计算了这种新型退相干的特征时间。

英文摘要:

In the viewpoint of quasi normal modes, we describe a novel decoherence mechanism of charge qubit of Josephson Junctions (JJ) in a lossy micro-cavity, which can appear in the realistic experiment for quantum computation based on JJ qubit. We show that the nonlinear coupling of a charge qubit to quantum cavity field can result in an additional dissipation of resonant mode due to its effective interaction between those non-resonant modes and a resonant mode, which is induced by the charge qubit itself. We calculate the characterized time of the novel decoherence by making use of the system plus bath method.

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