High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment

doi:10.1088/1674-1056/20/10/100312

中国物理B ›› 2011, Vol. 20 ›› Issue (10): 100312-100312.doi: 10.1088/1674-1056/20/10/100312

High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment

方卯发¹, 李艳玲²

(1)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; (2)School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

收稿日期:2011-01-16 修回日期:2011-04-20 出版日期:2011-10-15 发布日期:2011-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11074072) and the Innovation Foundation for Postgraduate of Hunan Province of China (Grant No. CX2010B213).

High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment

Li Yan-Ling(李艳玲)^a)† and Fang Mao-Fa(方卯发)^b)

^a School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; ^b College of Physics and Information Science, Hunan Normal University, Changsha 410081, China

Received:2011-01-16 Revised:2011-04-20 Online:2011-10-15 Published:2011-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11074072) and the Innovation Foundation for Postgraduate of Hunan Province of China (Grant No. CX2010B213).

摘要/Abstract

摘要： This paper analyses a system of two independent qubits off-resonantly coupled to a common non-Markovian reservoir at zero temperature. Compared with the results in Markovian reservoirs, we find that much higher values of entanglement can be obtained for an initially factorized state of the two-qubit system. The maximal value of the entanglement increases as the detuning grows. Moreover, the entanglement induced by non-Markovian environments is more robust against the asymmetrical couplings between the two qubits and the reservoir. Based on this system, we also show that quantum state transfer can be implemented for arbitrary input states with high fidelity in the non-Markovian regime rather than the Markovian case in which only some particular input states can be successfully transferred.

关键词: non-Markovian environment, entanglement generation, quantum state transfer

Abstract: This paper analyses a system of two independent qubits off-resonantly coupled to a common non-Markovian reservoir at zero temperature. Compared with the results in Markovian reservoirs, we find that much higher values of entanglement can be obtained for an initially factorized state of the two-qubit system. The maximal value of the entanglement increases as the detuning grows. Moreover, the entanglement induced by non-Markovian environments is more robust against the asymmetrical couplings between the two qubits and the reservoir. Based on this system, we also show that quantum state transfer can be implemented for arbitrary input states with high fidelity in the non-Markovian regime rather than the Markovian case in which only some particular input states can be successfully transferred.

Key words: non-Markovian environment, entanglement generation, quantum state transfer

中图分类号: (Entanglement measures, witnesses, and other characterizations)

03.67.Mn

03.65.Ta (Foundations of quantum mechanics; measurement theory) 03.65.Ud (Entanglement and quantum nonlocality)

李艳玲, 方卯发. High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment[J]. 中国物理B, 2011, 20(10): 100312-100312.

Li Yan-Ling(李艳玲) and Fang Mao-Fa(方卯发) . High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment[J]. Chin. Phys. B, 2011, 20(10): 100312-100312.

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High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment

High entanglement generation and high fidelity quantum state transfer in a non-Markovian environment

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