Decoherence and purity of a driven solid-state qubit in Ohmic bath

Details Decoherence and purity of a driven solid-state qubit in Ohmic bath Decoherence and purity of a driven solid-state qubit in Ohmic bath

2008-03-31

arxiv.org/abs/0803.4365v1

Physica E 40 (2008) 2671-2676

Physics

Quantum Physics

9 pages, 8 figures

Scientific paper

10.1016/j.physe.2007.12.003

In this paper we study the decoherence and purity of a driven solid-state qubit in the Ohmic bath by using the method based on the master equation. At first, instead of solving the master equation we investigate the coefficients of the equation which describe the shift in frequency, diffusive, decoherence, and so on. It is shown that one of the coefficients (we called it decoherence coefficient) is crucial to the decoherence of the qubit in the model. Then we investigate the evolution of the purity of the state in the model. From the analysis of the purity we see that the decoherence time of the qubit decrease with the increase of the amplitude of the driven fields and it is increase with the increase of the frequency of the driven fields.

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