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In this paper,we investigate the decoherence time of a double quantum dot (DQD) charge qubit in threekinds of baths through solving dynamics of the qubit.The dynamics of the qubit is investigated with Redfield masterequation.It is shown that the decoherence time of the qubit in Ohmic bath has the same order of magnitude as theexperiments reported.When the environment is modeled with the supra-Ohmic bath the decoherence time of the qubitis shorter than the experimental result.And when modeled with the sub-Ohmic bath the decoherence time of the qubitis longer than the experimental result.
In this paper, we investigate the decoherence time of a double quantum dot (DQD) charge qubit in threekinds of baths through solving dynamics of the qubit. Dynamics of the qubit is investigated with Redfield masterequation. It is shown that the decoherence time of the qubit in Ohmic bath has the same order of magnitude as theexperiments reported. Wen the environment is modeled with the supra-Ohmic bath the decoherence time of the qubitis shorter than the experimental result. And when modeled with the sub-Ohmic bath the decoherence time of the qubitis longer than the experimental result.