We calculate the degree of entanglement for some bipartite entangled states of continuous variables.These states include common two-mode squeezed vacuum state,thermal vacuum state of a free single particle(where thefictitious tilde system is regarded as another particle),and the squeezed vacuum state of two coupling harmonic oscillators.The degree of entanglement for these quantum systems are shown clearly by using the technique of integration withinan ordered product of operators.
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Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
Jing, Yumang
Pettersson, Olov
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KTH Royal Inst Technol, Stockholm, SwedenPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
Pettersson, Olov
He, Qiongyi
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Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
He, Qiongyi
Byrnes, Tim
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New York Univ Shanghai, 1555 Century Ave, Shanghai 200122, Peoples R China
NYU Shanghai, NYU ECNU Inst Phys, 3663 Zhongshan Rd North, Shanghai 200062, Peoples R China
Natl Inst Informat, Chiyoda Ku, 2-1-2 Hitotsubashi, Tokyo 1018430, Japan
NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USAPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
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Sichuan Normal Univ, Sch Math Sci, Chengdu 610066, Peoples R China
Sichuan Normal Univ, Inst Intelligent Informat & Quantum Informat, Chengdu 610066, Peoples R ChinaXihua Univ, Sch Sci, Chengdu 610039, Peoples R China
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Univ Nacl La Plata, FCE, IFLP, Dept Fis, CC 67, RA-1900 La Plata, Buenos Aires, ArgentinaUniv Nacl La Plata, FCE, IFLP, Dept Fis, CC 67, RA-1900 La Plata, Buenos Aires, Argentina
Gigena, N.
Rossignoli, R.
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Univ Nacl La Plata, FCE, IFLP, Dept Fis, CC 67, RA-1900 La Plata, Buenos Aires, ArgentinaUniv Nacl La Plata, FCE, IFLP, Dept Fis, CC 67, RA-1900 La Plata, Buenos Aires, Argentina
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Beihang Univ, Sch Math Sci, Beijing 100191, Peoples R ChinaBeihang Univ, Sch Math Sci, Beijing 100191, Peoples R China
Sun, Yize
Chen, Lin
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Beihang Univ, Sch Math Sci, Beijing 100191, Peoples R China
Beihang Univ, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R ChinaBeihang Univ, Sch Math Sci, Beijing 100191, Peoples R China