1Laboratory of Quantum Information Technology and SPTE, South China Normal University, Guangzhou 510006 2College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002
Anomalous Temperature Effects of the Entanglement of Two Coupled Qubits in Independent Environments
1Laboratory of Quantum Information Technology and SPTE, South China Normal University, Guangzhou 510006 2College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002
摘要We investigate the entanglement dynamical behavior of two coupled qubits via a Heisenberg XX interaction, which are connected with two independent finite temperature heat baths. By numerical simulations of the quantum master equation, it is found that the interesting phenomena of entanglement sudden death (ESD) as well as sudden birth (ESB) appear during the evolution process for particular initial states. We also show that two critical temperatures T1 (determining that the quantum state is entangled or separable) and T2 (where maximal stationary entanglement can be observed) exist, and stationary entanglement exhibits a non-monotonic behavior as a function of the finite temperature noise strength. These results enlarge the domain of the reasonable experimental temperature where stationary entanglement can be observable.
Abstract：We investigate the entanglement dynamical behavior of two coupled qubits via a Heisenberg XX interaction, which are connected with two independent finite temperature heat baths. By numerical simulations of the quantum master equation, it is found that the interesting phenomena of entanglement sudden death (ESD) as well as sudden birth (ESB) appear during the evolution process for particular initial states. We also show that two critical temperatures T1 (determining that the quantum state is entangled or separable) and T2 (where maximal stationary entanglement can be observed) exist, and stationary entanglement exhibits a non-monotonic behavior as a function of the finite temperature noise strength. These results enlarge the domain of the reasonable experimental temperature where stationary entanglement can be observable.
SHAN Chuan-Jia,**,CAO Shuai,XUE Zheng-Yuan,ZHU Shi-Liang. Anomalous Temperature Effects of the Entanglement of Two Coupled Qubits in Independent Environments[J]. 中国物理快报, 2012, 29(4): 40301-040301.
SHAN Chuan-Jia,**,CAO Shuai,XUE Zheng-Yuan,ZHU Shi-Liang. Anomalous Temperature Effects of the Entanglement of Two Coupled Qubits in Independent Environments. Chin. Phys. Lett., 2012, 29(4): 40301-040301.
[1] Bennett C H et al 1993 Phys. Rev. Lett. 70 1895Xue Z Y, Yang M, Yi Y M and Cao Z L 2006 Opt. Commun. 258 315Chen Y et al 2006 New J. Phys. 8 97[2] Wu Y, Payne M G, Hagley E W and Deng L 2004 Phys. Rev. A 70 063812Wu Y, Payne M G, Hagley E W and Deng L 2004 Phys. Rev. A 69 063803Bai Y K, Yang D and Wang Z D 2007 Phys. Rev. A 76 022336[3] Wang C, Deng F G, Long G L 2005 Phys. Rev. A 71 044305Mei F et al 2010 Phys. Rev. A 82 052315[4] Wang X G 2001 Phys. Rev. A 64 012313Wang X G 2002 Phys. Rev. A 66 044305Wang X G 2002 Phys. Rev. A 66 034302[5] Grover L 1998 Phys. Rev. Lett. 80 4329[6] Yu T and Eberly J H 2004 Phys. Rev. Lett. 93 140404[7] Liao J Q, Huang J F and Kuang L M 2011 Phys. Rev. A 83 052110Huang X L, Guo J L and Yi X X 2009 Phys. Rev. A 80 054301Quan H T, Wang Z D and Sun C P 2007 Phys. Rev. A 76 012104[8] Ikram M, Li F L and Zubairy M S 2007 Phys. Rev. A 75 062336Shan C J et al 2008 Chin. Phys. Lett. 25 817[9] Jing J, Lü Z G and Yang G H 2007 Phys. Rev. A 76 032322Liao X P, Fang M F, Zheng X J and Cai J W 2007 Phys. Lett. A 367 436[10] Yang Q, Yang M, Cao Z L et al 2008 Chin. Phys. Lett. 25 825Jiang F J, Shi M J and Du J F 2011 Chin. Phys. Lett. 28 020308Liu Z Q and Liang X T 2011 Chin. Phys. Lett. 28 089201[11] Almeida M P et al 2007 Sience 316 579Xu J et al 2010 Nat. Commun. 1 7[12] Laurat J et al 2007 Phys. Rev. Lett. 99 180504[13] López C E et al 2008 Phys. Rev. Lett. 101 080503[14] Li Y, Zhou J and Guo H 2009 Phys. Rev. A 79 012309[15] Ficek Z and Tanas R 2008 Phys. Rev. A 77 054301Tang Z H, Li G X and Ficek Z 2010 Phys. Rev. A 82 063837[16] Maniscalco S et al 2008 Phys. Rev. Lett. 100 090503Li C F et al 2011 Chin. Phys. Lett. 28 120302[17] Bellomo B, Franco R L and Compagno G 2007 Phys. Rev. Lett. 99 160502Lu X M, Wang X G and Sun C P 2010 Phys. Rev. A 82 042103[18] Li J G, Zou J A and Shao B 2010 Phys. Rev. A 82 042318Zhou J, Wu C J, Zhu M Y and Guo H 2009 J. Phys. B 42 215505[19] Breuer H P and Petruccione F 2002 The Theory of Open Quantum Systems (Oxford: Oxford University)[20] Kim K et al 2010 Nature 465 590Simon J et al 2011 Nature 472 307[21] Wooters W K 1998 Phys. Rev. Lett. 80 2245
2012, Vol. 29 
