Steady-State Discord Between Two Qubits Coupled Collectively to a Thermal Reservoir |
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Authors: | Xiang-Ping Liao Jian-Shu Fang Mao-Fa Fang Zhong Huang |
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Institution: | 1.College of Science,Hunan University of Technology,Zhuzhou,China;2.College of Physics and Information Science,Hunan Normal University,Changsha,China |
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Abstract: | We study the dynamics of quantum discord between two qubits coupled collectively to a thermal reservoir. For comparison, we
also consider the dynamics of quantum entanglement. It is shown that we can obtain a stable quantum discord induced by the
thermal environment when the discord of the initial state is zero. The thermal environment can also induce a stable amplification
of the initially prepared quantum discord for certain X-type states. It is very valuable that the quantum discord is more
resistant against the thermal environment than quantum entanglement. And, we have demonstrated that the sudden death of discord
in a Markovian regime is impossible even at high temperature. It provides us a feasible way to create and protect quantum
correlation in the case of a high-temperature thermal environment for various physical system such as trapped ions, quantum
dots or Josephson junctions. |
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Keywords: | |
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