Quantum discord dynamics of non-coupled two-qubit system interacting with reservoirs

Abstract

Abstract:

A general expression of quantum discord for structure density matrix was derived. Then, the dissipative dynamics of non-coupled two qubits independently interacting with their reservoir was solved by the non-Markovian master equation in a single excitation state. Under the detuning spectral density, the quantum discord dynamics was discussed and compared in different coupling regime. The results showed that this expression was employed to any physical system having structure density matrix, and we further confirm the two variants of master equations were exploited in different coupled regimes in the description of quantum correlation dynamics. It is convenient to calculate the quantum discord for later study and provide certain reference about which kind of master equation used in different coupling areas.

Key words: quantum optics, quantum discord, non-Markovian master equation, correlation function

CLC Number:

O431.2

WANG Xiao-yun, DIND Bang-fu，ZHAO He-ping. Quantum discord dynamics of non-coupled two-qubit system interacting with reservoirs[J]. J4, 2012, 29(3): 323-329.

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