A qualitative perspective on the dynamics of a single-Cooper-pair box with a phase-damped cavity

Details A qualitative perspective on the dynamics of a single-Cooper-pair box with a phase-damped cavity A qualitative perspective on the dynamics of a single-Cooper-pair box with a phase-damped cavity

2008-01-18

arxiv.org/abs/0801.2905v2

J. Phys. A: Math. Theor. 41 185304 (2008)

Physics

Quantum Physics

15 pages, 4 figures, some modifications have been done

Scientific paper

In a recent paper Dajka, et.al., [J. Phys. A \textbf{40}, F879 (2007)] predicted that some composite systems can be entangled forever even if coupled with a thermal bath. We analyze the transient entanglement of a single-Cooper-pair box biased by a classical voltage and irradiated by a quantized field and find the unusual feature that the phase-damped cavity can lead to a long-lived entanglement. The results show an asymptotic value of the idempotency defect (concurrence) which embodies coherence loss (entanglement survival), independent of the interaction development by dependent critically on environment.

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