Study of the decoherence of a double quantum dot charge qubit via the Redfield equation.pdfVIP
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Study of the decoherence of a double quantum dot charge qubit via the Redfield equation
Study of the decoherence of a double quantum dot charge qubit
via the Redfield equation
Zeng-Zhao Li, Xiao-Yin Pan, Xian-Ting Liang∗
Department of Physics and Institute of Modern Physics,
Ningbo University, Ningbo 315211, China
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Abstract
By using the Redfield form of the master equation, we investigate the decoherence times of a
double quantum dot charge qubit (DQDCQ) in three different cases, namely when it is coupled
to (I) the piezoelectric coupling phonon bath (PCPB), (II) the deformation coupling phonon bath
(DCPB), and (III) the Ohmic bath. It is found that our results for case (I) and (II) are in the
same magnitude with those obtained via the exact path integral methods, while for case (III), the
decoherence time is in well agreement with the experimental value.
Keywords: Quantum dot; Decoherence; Redfield equation
PACS numbers: 73.63.Kv, 03.65.Yz, 03.67.Lx
I. INTRODUCTION
The double quantum dot (DQD) charge qubit [1-5] is one of the qubits that are considered
to be promising candidates for the realization of the building blocks of quantum information
processing. Its two low-energy states are denoted as the local states |0 and |1, which could
be controlled via external voltage sources. There exist some effective schemes to prepare the
initial states and readout the final states of the qubit [6]. It is also known that this kind of
qubit is coupled to its environment inevitably. Therefore, it is believed that the decoherence
might be the central impediment for the qubit to be taken as the cell of quantum computer.
He
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