Quantum entanglement of an entangled coherent state：Role of particle losses

doi:10.1088/1674-1056/23/3/030310

中国物理B ›› 2014, Vol. 23 ›› Issue (3): 30310-030310.doi: 10.1088/1674-1056/23/3/030310

Quantum entanglement of an entangled coherent state：Role of particle losses

刘盼, 冯晓敏, 金光日

Department of Physics, Beijing Jiaotong University, Beijing 100044, China

收稿日期:2013-06-28 修回日期:2013-08-06 出版日期:2014-03-15 发布日期:2014-03-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11174028), the Fundamental Research Funds for the Central Universities of China (Grant No. 2011JBZ013), and the Program for New Century Excellent Talents in University of China (Grant No. NCET-11-0564).

Quantum entanglement of an entangled coherent state：Role of particle losses

Liu Pan (刘盼), Feng Xiao-Min (冯晓敏), Jin Guang-Ri (金光日)

Department of Physics, Beijing Jiaotong University, Beijing 100044, China

Received:2013-06-28 Revised:2013-08-06 Online:2014-03-15 Published:2014-03-15
Contact: Jin Guang-Ri E-mail:grjin@bjtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11174028), the Fundamental Research Funds for the Central Universities of China (Grant No. 2011JBZ013), and the Program for New Century Excellent Talents in University of China (Grant No. NCET-11-0564).

摘要/Abstract

摘要： We analyze entanglement properties of entangled coherent state (ECS), |α, 0>_1,2+|0, α >_1,2, with and without photon losses. By separating the coherent state into |α >=c₀|0>+???????, we derive exact results of the logarithmic negativity E_N, which quantifies the degree of entanglement between the two bosonic modes. Without particle losses, E_N=1 for the N00N state; while for the ECS, E_N increases from 0 to 1 as |α|²→∞. In the presence of photon losses, we find that the ECS with large enough photon number is more robust than that of the N00N state. An optimal ECS is obtained by maximizing E_N with respect to |α|².

关键词: quantum entanglement, entangled coherent state, photon losses

Abstract: We analyze entanglement properties of entangled coherent state (ECS), |α, 0>_1,2+|0, α >_1,2, with and without photon losses. By separating the coherent state into |α >=c₀|0>+, we derive exact results of the logarithmic negativity E_N, which quantifies the degree of entanglement between the two bosonic modes. Without particle losses, E_N=1 for the N00N state; while for the ECS, E_N increases from 0 to 1 as |α|²→∞. In the presence of photon losses, we find that the ECS with large enough photon number is more robust than that of the N00N state. An optimal ECS is obtained by maximizing E_N with respect to |α|².

Key words: quantum entanglement, entangled coherent state, photon losses

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

03.67.Mn

03.65.Ud (Entanglement and quantum nonlocality) 42.50.-p (Quantum optics)

刘盼, 冯晓敏, 金光日. Quantum entanglement of an entangled coherent state：Role of particle losses[J]. 中国物理B, 2014, 23(3): 30310-030310.

Liu Pan (刘盼), Feng Xiao-Min (冯晓敏), Jin Guang-Ri (金光日). Quantum entanglement of an entangled coherent state：Role of particle losses[J]. Chin. Phys. B, 2014, 23(3): 30310-030310.

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Quantum entanglement of an entangled coherent state：Role of particle losses

Quantum entanglement of an entangled coherent state：Role of particle losses

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