Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

doi:10.1088/1674-1056/22/8/080304

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 80304-080304.doi: 10.1088/1674-1056/22/8/080304

Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

苏晓龙

State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

收稿日期:2013-01-10 修回日期:2013-03-06 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2010CB923103), the National Natural Science Foundation of China (Grant Nos. 11174188 and 61121064), and the Fund from the Shanxi Scholarship Council of China (Grant No. 2012-010).

Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

Su Xiao-Long (苏晓龙)

State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

Received:2013-01-10 Revised:2013-03-06 Online:2013-06-27 Published:2013-06-27
Contact: Su Xiao-Long E-mail:suxl@sxu.edu.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2010CB923103), the National Natural Science Foundation of China (Grant Nos. 11174188 and 61121064), and the Fund from the Shanxi Scholarship Council of China (Grant No. 2012-010).

摘要/Abstract

摘要： A symmetric two-mode Gaussian entangled state is used to investigate the effect of excess noise on entanglement sudden death and Gaussian quantum discord with continuous variables. The results show that the excess noise in the channel can lead to entanglement sudden death of a symmetric two-mode Gaussian entangled state, while Gaussian quantum discord never vanishes. As a practical application, the security of a quantum key distribution (QKD) scheme based on a symmetric two-mode Gaussian entangled state against collective Gaussian attacks is analyzed. The calculation results show that the secret key cannot be distilled when entanglement vanishes and only quantum discord exists in such a QKD scheme.

关键词: continuous variable, entanglement, quantum key distribution

Abstract: A symmetric two-mode Gaussian entangled state is used to investigate the effect of excess noise on entanglement sudden death and Gaussian quantum discord with continuous variables. The results show that the excess noise in the channel can lead to entanglement sudden death of a symmetric two-mode Gaussian entangled state, while Gaussian quantum discord never vanishes. As a practical application, the security of a quantum key distribution (QKD) scheme based on a symmetric two-mode Gaussian entangled state against collective Gaussian attacks is analyzed. The calculation results show that the secret key cannot be distilled when entanglement vanishes and only quantum discord exists in such a QKD scheme.

Key words: continuous variable, entanglement, quantum key distribution

中图分类号: (Quantum communication)

03.67.Hk

03.67.Dd (Quantum cryptography and communication security) 42.50.Dv (Quantum state engineering and measurements) 42.50.-p (Quantum optics)

苏晓龙. Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord[J]. 中国物理B, 2013, 22(8): 80304-080304.

Su Xiao-Long (苏晓龙). Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord[J]. Chin. Phys. B, 2013, 22(8): 80304-080304.

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Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

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