[1] [1] R Horodecki, P Horodecki, M Horodecki, et al.. Quantum entanglement[J]. Rev Mod Phys, 2009, 81(2): 865-942.

[2] [2] S L Braunstein, P V Loock. Quantum information with continuous variables[J]. Rev Mod Phys, 2005, 77(2): 513-577.

[3] [3] N Gisin, R Thew. Quantum communication[J]. Nature Photonics, 2007, 1(3): 165-171.

[4] [4] T D Ladd, F Jelezko, R Laflamme, et al.. Quantum computers[J]. Nature, 2010, 464(7285): 45-53.

[5] [5] V Giovannetti, S Lloyd, L Maccone. Advances in quantum metrology[J]. Nature Photonics, 2011, 5(4): 222-229.

[6] [6] Su Xiaolong, Jia Xiaojun, Xie Changde, et al.. Multipartite entangled optical fields with continuous variables and their applications in quantum computation[J]. Physics, 2010, 39(11): 746-752.

[7] [7] B Julsgaard, J Sherson, J I Cirac, et al.. Experimental demonstration of quantum memory for light[J]. Nature, 2004, 432(7016): 482-486.

[8] [8] C W Chou, H De Riedmatten, D Felinto, et al.. Measurement-induced entanglement for excitation stored in remote atomic ensembles [J]. Nature, 2005, 438(7069): 828-832.

[9] [9] T Chanelière, D N Matsukevich, S D Jenkins, et al.. Storage and retrieval of single photons transmitted between remote quantum memories[J]. Nature, 2005, 438(7069): 833-836.

[10] [10] M D Eisaman, A André, F Massou, et al.. Electromagnetically induced transparency with tunable single-photon pulses[J]. Nature, 2005, 438(7069): 837-841.

[11] [11] R J Horowicz. Quantum correlation between fundamental and second harmonic in SHG[J]. Europhys Lett, 1989, 10(6): 537-542.

[12] [12] P Lodahl. Einstein-Podolsky-Rosen correlations in second-harmonic generation[J]. Phys Rev A, 2003, 68(2): 023806.

[13] [13] U L Andersen, P Buchhave. Squeezing and entanglement in doubly resonant, type II, second-harmonic generation[J]. J Opt Soc Am B, 2003, 20(9): 1947-1958.

[14] [14] Luo Yu, Li Ying, Pan Qing, et al.. Experimental generation of entangled lights from resonating frequency doubler[J]. Acta Optica Sinica, 2006, 26(2): 305-310.

[15] [15] Y M Li, S J Zhang, J L Liu, et al.. Quantum correlation between fundamental and second-harmonic fields via second-harmonic generation[J]. J Opt Soc Am B, 2007, 24(3): 660-663.

[16] [16] R Paschotta, M Collett, P Kurz, et al.. Bright squeezed light from a singly resonant frequenc doubler[J]. Phys Rev Lett, 1994, 72(24): 3807-3810.

[17] [17] H M Wiseman, M S Taubman, H A Bachor. Feedback-enhanced squeezing in second-harmonic generation[J]. Phys Rev A, 1995, 51(4): 3227-3233.