[1] [1] SANGOUARD N, SIMON C, DE RIEDMATTEN H, et al. Quantum repeaters based on atomic ensembles and linear optics[J]. Reviews of Modern Physics, 2011, 83(1):33-80. DOI: 10.1103/RevModPhys.83.33.

[2] [2] KIMBLE H J. The quantum internet[J]. Nature, 2008, 453(7198):1023-1030. DOI: 10.1038/nature07127.

[3] [3] WEHNER S, ELKOUSS D, HANSON R. Quantum internet: A vision for the road ahead[J]. Science, 2018, 362(6412):1-9. DOI: 10.1126/science.aam9288.

[4] [4] DUAN L M, LUKION M D, CIRAC J I, et al. Long-distance quantum communication with atomic ensembles and linear optics[J]. Nature, 2001, 414(22):413-418. DOI: 10.1038/35106500.

[5] [5] JING S, LUO X M, CHEN L Q, et al. Observation of prolonged coherence time of the collective spin wave of an atomic ensemble in a paraffin-coated 87Rb vapor cell[J]. Phys Rev A, 2009, 80, 062303. DOI: 10.1103/PhysRevA.80.062303.

[6] [6] ZHANG C L, CHEN M F. Quantum state transfer between atomic ensembles trapped in separate cavities via adiabatic passage[J]. Chinese Phys B, 2015, 24:070310. DOI: 10.1088/1674-1056/24/7/070310.

[7] [7] CLAUSER J F, HORNE M A, SHIMONY A, et al. Proposed experiment to test local hidden-variable theories[J]. Phys Rev Lett, 1969, 23:880-884. DOI: 10.1103/PhysRevD.4.1243.

[8] [8] MATSUKEVICH D N, CHANELIERE T, BHATTACHARYA M, et al. Entanglement of a photon and a collective atomic excitation[J]. Phys Rev Lett, 2005, 95(4):1-4. DOI: 10.1103/PhysRevLett.95.040405.

[9] [9] DE RIEDMATTEN H, LAURAT J, CHOU C W, et al. Direct measurement of decoherence for entanglement between a photon and stored atomic excitation[J]. Phys Rev Lett, 2006, 97(11):1-4. DOI: 10.1103/PhysRevLett.97.113603.

[10] [10] CHEN S, CHEN Y A, ZHAO B, et al. Demonstration of a stable atom-photon entanglement source for quantum repeaters[J]. Phys Rev Lett, 2007, 99(18):1-4. DOI: 10.1103/PhysRevLett.99.180505.

[11] [11] DING D S, ZHANG W, ZHOU Z Y, et al. Raman quantum memory of photonic polarized entanglement[J]. Nat Photonics, 2015, 9(5):332-338. DOI: 10.1038/nphoton.2015.43.

[12] [12] WU Y, TIAN L, XU Z, et al. Simultaneous generation of two spin-wave-photon entangled states in an atomic ensemble[J]. Phys Rev A, 2016, 93(5):1-8. DOI: 10.1103/PhysRevA.93.052327.

[13] [13] BAO X H, REINGRUBER A, DIETRICH P, et al. Efficient and long-lived quantum memory with cold atoms inside a ring cavity[J]. Nature Physics, 2012, 8:517-521. DOI: 10.1038/NPHYS2324

[14] [14] WANG S Z, WANG M J, WEN Y F, et al. Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts[J]. Communications Physics, 2021, 4:168. DOI: 10.1038/s42005-021-00670-9

[15] [15] LETTNER M, MCKE M, RIEDL S, et al. Remote Entanglement between a Single Atom and a Bose-Einstein Condensate[J]. Phys Rev Lett, 2011, 106(21):210503. DOI: 10.1103/PhysRevLett.106.210503

[16] [16] Yang S J, Wang X J, Li J, et al. Highly Retrievable Spin-Wave-Photon Entanglement Source[J]. Phys Rev Lett, 2015, 114(21):210501. DOI: 10.1103/PhysRevLett.114.210501

[18] [18] ZHAO B, CHEN Y A, BAO X H, et al. A millisecond quantum memory for scalable quantum networks[J]. Nature Physics, 2008, 5(2):95. DOI: 10.1038/nphys1153

[19] [19] ZHAO R, DUDIN Y O, JENKINS S D, et al. Long-lived quantum memory[J]. Nature Physics, 2009, 5(2):100-104. DOI: 10.1038/nphys1152