[1] [1] N. Gisin, G. G. Ribordy, W. Tittel, et al. Quantum cryptography[J]. Reviews of Modern Physics, 2002, 74:145-195. DOI: 10.1103/RevModPhys.74.145.

[3] [3] Bouwmeester D, Mattle K, Pan J W, et al. Experimental quantum teleportation of arbitrary quantum states[J], Applied Physics B-Lasers and Optics, 1998, 67:749-752. DOI: 10.1007/s003400050575.

[4] [4] Achilles D, Silberhorn C, Walmsley I A. Direct, Loss-Tolerant Characterization of Nonclassical Photon Statistics[J]. Physical Review Letters, 2006, 97(4):043602. DOI: 10.1103/PhysRevLett.97.043602.

[5] [5] Li J, Su J, Cui L, et al. Generation of pure-state single photons with high heralding efficiency by using a three-stage nonlinear interferometer[J]. Applied Physics Letters, 2020, 116(20):204002. DOI: 10.1063/5.0003601.

[6] [6] Sapritsky V I. Black-body radiometry[J]. Metrologia, 1995, 32(6):411. DOI: 10.1088/0026-1394/32/6/2.

[7] [7] Tsai B K. Developments for a New Spectral Irradiance Scale at the National Institute of Standards and Technology[J]. Journal of Research of the National Institute of Standards & Technology, 1997, 102(5):551-558. DOI: 10.6028/jres.102.036.

[10] [10] Klyshko D N. Use of two-photon light for absolute calibration of photoelectric detectors[J]. Sov J Quantum Electron, 1980, 10:1112-1116. DOI: 10.1070/QE1980v010n09ABEH010660.

[11] [11] Ware M, Migdall A. Single-photon detector characterization using correlated photons: the march from feasibility to metrology[J]. Journal of Modern Optics, 2004, 51:1549-1557. DOI: 10.1080/09500340408235292.

[12] [12] Rarity J G, Ridley K D, Tapster P R. Absolute measurement of detector quantum efficiency using parametric downconversion[J]. Applied Optics, 1987, 26:4616-4619. DOI: 10.1364/AO.26.004616.

[13] [13] Migdall A L, Datla R U, Sergienko A. et al. Absolute detector quantum-efficiency measurements using correlated photons[J]. Metrologia, 1995, 32:479-483. DOI: 10.1088/0026-1394/32/6/15.

[14] [14] Brida G, Genovese M, Novero C. An application of two-photon entangled states to quantum metrology[J]. Journal of Modern Optics, 2000, 47:2099-2104. DOI: 10.1080/09500340008235132.

[15] [15] Chen X H, Zhai Y H, Zhang D. et al. Absolute self-calibration of the quantum efficiency of single-photon detectors[J]. Optics Letters, 2006, 31:2441-2443. DOI: 10.1364/OL.31.002441.

[16] [16] Li X. Ma X, Quan L, et al. Quantum efficiency measurement of single-photon detectors using photon pairs generated in optical fibers[J]. J Opt Soc Am B, 2010, 27:1857-1865. DOI: 10.1364/JOSAB.27.001857.

[17] [17] Polyakov S V, Migdall A L. High accuracy verification of a correlated-photon- based method for determining photoncounting detection efficiency[J]. Opt Express, 2007, 15:1390-1407. DOI: 10.1364/OE.15.001390.

[18] [18] Polyakov S V. Chapter 8 - Single-Photon Detector Calibration[M]. (Academic Press, 2013). vol. 45, pp.257-281. DOI: 10.1016/B978-0-12-387695-9.00008-1.

[19] [19] Quantum Sensing, Id221 brochure [J/OL]. ID QUANTIQUE, 2019, [2019-07-08]. https://marketing.idquantique.com/ acton/attachment/11868/f-023d/1/-/-/-/-/ID221Brochure:pdf:.

[20] [20] Gol’tsman G N, Smirnov K, Kouminov P, et al. Fabrication of nanostructured superconducting single-photon detectors[J]. IEEE Transactions on Applied Superconductivity, 2003, 13(2):192-195. DOI: 10.1109/TASC.2003.813678.

[21] [21] Avella A, Ruo-Berchera I, Degiovanni I P. et al. Absolute calibration of an emccd camera by quantum correlation, linking photon counting to the analog regime[J], Opt Lett, 2016, 41:1841-1844. DOI: 10.1364/OL.41.001841.

[22] [22] Burnham D C, Weinberg D L. Observation of Simultaneity in Parametric Production of Optical Photon Pairs[J]. Physical Review Letters, 1970: 25(2):84-87. DOI: 10.1103/PhysRevLett.25.84.

[23] [23] Fiorentino M, Voss P L, Sharping J E, et al. All-fiber photon-pair source for practical quantum communications[J]. IEEE Photonics Technology Letters, 2002, 14(7):983-985. DOI: 10.1109/lpt.2002.1012406.

[24] [24] Hong C K, Mandel L. Experimental realization of a localized one-photon state[J]. Physical Review Letters, 1986, 56:58-60. DOI: 10.1103/PhysRevLett.56.58.

[25] [25] Chen J, Li X, Kumar P. Two-photon-state generation via four-wave mixing in optical fibers[J]. Physical Review A, 2005, 72(3):033801. DOI: 10.1103/PhysRevA.72.033801.

[26] [26] Grice W P, Walmsley I A. Spectral information and distinguishability in type-II down-conversion with a broadband pump[J]. Physical Review A, 1997, 56(2):1627-1634. DOI: 10.1103/PhysRevA.56.1627.

[27] [27] Garay-Palmett K, McGuinness H J, Cohen O, et al. Photon pair-state preparation with tailored spectral properties by spontaneous four-wave mixing in photonic-crystal fiber[J]. Opt Express, 2007, 15:14870-14886. DOI: 10.1364/OE.15.014870.

[28] [28] Su J. Cui L, Li X. Wavelength tunable source of correlated photon pairs based on photonic crystal fiber[J]. IEEE Photonics Technology Letters, 2018, 30:907-910. DOI: 10.1109/LPT.2018.2824850.

[29] [29] Agrawal G P. Nonlinear Fiber Optics[M]. Academic Press, San Diego, 2001.

[30] [30] Li X, Voss P, Chen J, et al. Measurement of co- and cross-polarized raman spectra in silica fiber for small detunings[J]. Optics Express, 2005, 13:2236-2244. DOI: 10.1364/OPEX.13.002236.

[32] [32] Oh J, Antonelli C, Tur M, et al. Method for characterizing single photon detectors in saturation regime by cw laser[J]. Optics Express, 2010, 18(6):5906-5911. DOI: 10.1364/OE.18.005906.