摘要We investigate the entanglement swapping of continuous variable using the pair coherent state as the input state and the two-mode squeezed vacuum which is exposed in a phase decoherence environment as the quantum channel. By adopting the log-negativity as the measure of entanglement, we analyze how entanglement of the two initial states and the phase decoherence environment affect the entanglement swapping quality.
Abstract：We investigate the entanglement swapping of continuous variable using the pair coherent state as the input state and the two-mode squeezed vacuum which is exposed in a phase decoherence environment as the quantum channel. By adopting the log-negativity as the measure of entanglement, we analyze how entanglement of the two initial states and the phase decoherence environment affect the entanglement swapping quality.
[1] Braunstein S L and van Loock P 2005 Rev. Mod. Phys. 77 513 [2] Alber G, Beth T, Horodecki M, Horodecki P, Horodecki R,R\"{otteler, Weinfurter H, Werner R and Zeiling A 2001 QuantumInformation: An Introduction to Basic Theoretical Concepts andExperiments (Berlin: Springer) [3] Bennett C H, Shor P W, Smolin J A and Thapliyal A V 1999 Phys. Rev. Lett. 83 3081 [4] Schumacher B and Nielsen M A 1996 Phys. Rev. A 54 2629 [5] Zukowski M, Zeilinger A, Horne M A and Ekert A K 1993 Phys. Rev. Lett. 71 4287 [6] Pan J W, Bouwmeester D, Weinfurter H and Zeilinger A 1998 Phys. Rev. Lett. 80 3891 [7] Goebel A M, Wagenknecht C, Zhang Q, Chen Y A, Chen K,Schmiedmayer J and Pan J W 2008 Phys. Rev. Lett. 101080403 [8] van Loock P and Braunstein S L 1999 Phys. Rev. A 61 010302 [9] Jia X J, Su X L, Pan Q, Gao J R, Xie C D and Peng K C 2004 Phys. Rev. Lett. 93 250503 [10] Li H R, Li F L, Yang Y and Zhang Q 2005 Phys. Rev.A 71 022314 [11] Kim M S, Son W, Bu\v{zek V and Knight P L 2002 Phys. Rev. A 65 032323 [12] Kitagawa A, Takeoka M, Sasaki M and Cheefles A 2006 Phys. Rev. A 73 042310 [13] Dell'Anno F, De Siena S, Albano L and Illuminati F 2007 Phys. Rev. A 76 022301 [14] Li S B, Wu R K, Wang Q M and Xu J B 2004 Phys.Lett. A 325 206 [15] Xu H S and Xu J B 2008 Chin. Phys. Lett. 251553 [16] Rains E M 2001 IEEE Trans. Inf. Theory 472921 [17] Vidal G and Werner R F 2002 Phys. Rev. A 65032314 [18] Plenio M B 2005 Phys. Rev. Lett. 95 090503 [19] Horodecki M, Horodecki P and Horodecki R 1996 Phys.Lett. A 223 1 [20] Agarwal G S 1986 Phys. Rev. Lett. 57 827 [21] Braunstein S L, D'Ariano G M, Milburn G J and Sacchi M F2000 Phys. Rev. Lett. 84 3486
2009, Vol. 26 
