Single‐photon‐level 2D fiber spectrometer at 800 nm band

doi:10.3969/j.issn.1007-5461.2026.05.009

Abstract

Abstract: The single-photon-level two-dimensional fiber spectrometer can efficiently measure the joint spectral distribution of biphotons produced by spontaneous parametric down-conversion processes, and has been widely used in quantum information technology in the 1550 nm band. However, this instrument is currently not suitable for use in the 800 nm band due to the lack of low-loss dispersion fibers. To overcome this limitation, we constructed a single-photon-level two-dimensional fiber spectrometer for the 800 nm band by employing two single-mode fibers of 0.544 km length designed for the 800 nm band, two silicon-based single-photon detectors, and a time interval analyzer, expanding the application of the twodimensional fiber spectrometer from 1550 nm band to 800 nm band. After measurement and calibration, the resolution of the spectrometer was confirmed to be 7.8 nm. And then, utilizing this spectrometer, we measured the joint spectral distribution of biphotons with a center wavelength of 810 nm generated from a periodically poled potassium titanyl phosphate crystal, verifying the resolution and applicability of the spectrometer. This work is expected to promote the advancement of time-frequency measurement techniques with single-photon level in the visible and near-infrared spectral regions.

Key words: quantum optics, biphoton spectrometer, joint spectral intensity, quantum entanglement; dispersive fiber

CLC Number:

O433.1

XU Dan , ZENG Ziqi , YUAN Chenzhi , JIN Ruibo , . Single‐photon‐level 2D fiber spectrometer at 800 nm band[J]. Chinese Journal of Quantum Electronics, 2026, 43(5): 769-777.

References

[1] X.-X. Fang, L. Wang, and H. Lu, “E?icient generation of broadband photon pairs in shallow-etched lithium niobate nanowaveguides,” Opt. Express 32, 22945–22954 (2024). [2] X. Xiang, R. Dong, R. Quan, Y. Jin, Y. Yang, M. Li, T. Liu, and S. Zhang, “Hybrid frequency-time spectrograph for the spectral measurement of the two-photon state,” Opt. Lett. 45, 2993–2996 (2020). [3] 杨冈, 杨然, 龚彦晓, 祝世宁, “Direct measurement of nonlocal quantum states without approxi- mation,” Chinese Physics B 32, 298–302 (2023). [4] 冯畅, 崔亮, 苏杰, 李小英, “利用关联光子对多波段标定单光子探测器效率,” 量子光学学报 27, 21–27 (2021). [5] A. Christ, A. Fedrizzi, H. Hübel, T. Jennewein, and C. Silberhorn, “Chapter 11 - parametric down- conversion,” in “Single-Photon Generation and Detection,” , vol. 45 of Experimental Methods in the Physical Sciences, A. Migdall, S. V. Polyakov, J. Fan, and J. C. Bienfang, eds. (Academic Press, 2013), pp. 351–410. [6] R.-B. Jin, Z.-Q. Zeng, D. Xu, C.-Z. Yuan, B.-H. Li, Y. Wang, R. Shimizu, M. Takeoka, M. Fujiwara, M. Sasaki, and P.-X. Lu, “Spectrally resolved franson interference,” Sci. China: Phys., Mech. Astron.67, 250312 (2024). [7] 李百宏, 夏志广, 项晓, 靳亚晴, 权润爱, 董瑞芳, 刘涛, and 张首刚, “基于波长到时间映射快速测量纠缠光子相位匹配波长的实验方法,” 中国激光 48, 154–161 (2021). [8] 周志远 and 史保森, “基于频谱迁移的红外探测研究进展 (特邀),” 红外与激光工程 52, 9–19 (2023). [9] 尤世欣, 袁晨智, and 金锐博, “Bell 不等式的直观解释与研究进展,” 量子光学学报 30, 7–23 (2024). [10] R.-B. Jin, Z.-Q. Zeng, C. You, and C. Yuan, “Quantum interferometers: Principles and applications,” Progress in Quantum Electronics 96, 100519 (2024). [11] R.-B. Jin, R. Shimizu, K. Wakui, H. Benichi, and M. Sasaki, “Widely tunable single photon source with high purity at telecom wavelength,” Opt. Express 21, 10659–10666 (2013). [12] P. J. Mosley, J. S. Lundeen, B. J. Smith, and I. A. Walmsley, “Conditional preparation of single photons using parametric downconversion: a recipe for purity,” New Journal of Physics 10, 093011 (2008). [13] M. Avenhaus, A. Eckstein, P. J. Mosley, and C. Silberhorn, “Fiber-assisted single-photon spectro- graph,” Optics Letters 34, 2873–2875 (2009). [14] T. Gerrits, F. Marsili, V. B. Verma, L. K. Shalm, M. Shaw, R. P. Mirin, and S. W. Nam, “Spectral correlation measurements at the Hong-Ou-Mandel interference dip,” Physical Review A 91 (2015). [15] R.-B. Jin, T. Gerrits, M. Fujiwara, R. Wakabayashi, T. Yamashita, S. Miki, H. Terai, R. Shimizu, M. Takeoka, and M. Sasaki, “Spectrally resolved Hong-Ou-Mandel interference between independent photon sources,” Optics Express 23, 28829–28835 (2015). [16] R.-B. Jin, R. Shimizu, M. Fujiwara, M. Takeoka, R. Wakabayashi, T. Yamashita, S. Miki, H. Terai, T. Gerrits, and M. Sasaki, “Simple method of generating and distributing frequency-entangled qudits,” Quantum Science and Technolgy 1 (2016). [17] J.-P. W. MacLean, J. M. Donohue, and K. J. Resch, “Ultrafast quantum interferometry with energy- time entangled photons,” Physical Review A 97 (2018). [18] R.-B. Jin and R. Shimizu, “Extended Wiener-Khinchin theorem for quantum spectral analysis,” Op- tica 5, 93–98 (2018). [19] R.-B. Jin, H. Oshima, T. Yagisawa, M. Yabuno, S. Miki, F. China, H. Terai, and R. Shimizu, “Two- photon spectral modulation via temporal manipulation: Quantum optical synthesis of spectral modes from temporal square waves,” Applied Physics Letters 121 (2022). [20] S. Merkouche, V. Thiel, and B. J. Smith, “Spectrally resolved four-photon interference of time-frequency-entangled photons,” Physical Review A 105 (2022). [21] Y. Tian, W.-H. Cai, Z.-X. Yang, F. Chen, R.-B. Jin, and Q. Zhou, “Hong-ou-mandel interference of entangled photons generated under pump-tight-focusing condition (in Chinese),” Acta Phys. Sin. 71, 054201 (2022). [22] Y.-W. Zhai, R.-F. Dong, R.-A. Quan, X. Xiang, T. Liu, and S.-G. Zhang, “Cascaded Hong-Ou-Mandel interference of entangled photon pairs and its application in multiple delay parameters measurement (in Chinese),” Acta Phys. Sin. 70, 120302 (2021).