The quantum correlation dynamics of two qubits in finite-temperature environments with dynamical decoupling pulses |
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Authors: | Qi-Liang He Jing-Bo Xu Dao-Xin Yao Ye-Qi Zhang |
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Institution: | 1. Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou 310027, People’s Republic of China;2. State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, People’s Republic of China;3. Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA |
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Abstract: | We investigate the dynamics of quantum correlation between two noninteracting qubits each inserted in its own finite-temperature environment with 1/f spectral density. It is found that the phenomenon of sudden transition between classical and quantum decoherence exists in the system when two qubits are initially prepared in X-type quantum states, and the transition time depends on the initial-state of two qubits, the qubit–environment coupling constant and the temperature of the environment. Furthermore, we explore the influence of dynamical decoupling pulses on the transition time and show that it can be prolonged by applying the dynamical decoupling pulses. |
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Keywords: | Quantum correlation Finite-temperature environment Sudden transition Dynamical decoupling pulse |
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