Non-Markov dynamics and phonon decoherence of a double quantum dot charge qubit

Details Non-Markov dynamics and phonon decoherence of a double quantum dot charge qubit Non-Markov dynamics and phonon decoherence of a double quantum dot charge qubit

2005-06-29

arxiv.org/abs/quant-ph/0506258v4

Physical Review B 72, 245328 (2005)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.245328

In this paper we investigate decoherence times of a double quantum dot (DQD) charge qubit due to it coupling with acoustic phonon baths. We individually consider the acoustic piezoelectric as well as deformation coupling phonon baths in the qubit environment. The decoherence times are calculated with two kinds of methods. One of them is based on the qusiadiabatic propagator path integral (QUAPI) and the other is based on Bloch equations, and two kinds of results are compared. It is shown that the theoretical decoherence times of the DQD charge qubit are shorter than the experimental reported results. It implies that the phonon couplings to the qubit play a subordinate role, resulting in the decoherence of the qubit.

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