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Dynamical control of population and entanglement for open Λ-type atoms by engineering the environment |
| Xiao-Lan Wang(王晓岚), Yu-Kun Ren(任玉坤), Hao-Sheng Zeng(曾浩生) |
| Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China |
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Abstract The exactly analytical solution for the dynamics of the dissipative Λ-type atom in the zero-temperature Lorentzian environment is presented. On this basis, we study the evolution of the population and entanglement. We find that the stable populations on the two lower levels of the Λ-type atom can be effectively adjusted by the combination of the relative decay rate and the environmental spectral frequency. However, for the initial Werner-like state, the stable entanglement between the two Λ-type atoms has very little tunability. Furthermore, the stable entanglement for the bilateral environment case is larger than that of the unilateral environmental case. A nonintuitive relation between the stable entanglement and stable population is found.
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Received: 06 September 2018
Revised: 10 December 2018
Accepted manuscript online:
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PACS:
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11275064), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20124306110003), and the Construct Program of the National Key Discipline, China. |
Corresponding Authors:
Hao-Sheng Zeng
E-mail: hszeng@hunnu.edu.cn
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Cite this article:
Xiao-Lan Wang(王晓岚), Yu-Kun Ren(任玉坤), Hao-Sheng Zeng(曾浩生) Dynamical control of population and entanglement for open Λ-type atoms by engineering the environment 2019 Chin. Phys. B 28 030301
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