Decoherence of a two-qubit system with a variable bath coupling operator

Details Decoherence of a two-qubit system with a variable bath coupling operator Decoherence of a two-qubit system with a variable bath coupling operator

2005-04-29

arxiv.org/abs/cond-mat/0504787v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

We examine the decoherence of an asymmetric two-qubit system that is coupled via a tunable interaction term to a common bath or two individual baths of harmonic oscillators. The dissipative dynamics are evaluated using the Bloch-Redfield formalism. It is shown that the behaviour of the decoherence effects is affected mostly by different symmetries between the qubit operator which is coupled to the environment and temperature, whereas the differences between the two bath configurations are very small. Moreover, it is elaborated that small imperfections of the qubit parameters do not lead to a drastic enhancement of the decoherence rates.

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