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

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

2004-09-09

arxiv.org/abs/quant-ph/0409053v3

Phys. Rev. A 71, 032302 (2005)

Physics

Quantum Physics

6 pages, 2 figurs

Scientific paper

10.1103/PhysRevA.71.032302

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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