Photonics Research, Volume. 9, Issue 6, 1134(2021)

Effect of dispersion on indistinguishability between single-photon wave-packets

Yun-Ru Fan1, Chen-Zhi Yuan1,5、*, Rui-Ming Zhang1, Si Shen1, Peng Wu1, He-Qing Wang2, Hao Li2, Guang-Wei Deng1, Hai-Zhi Song1,3, Li-Xing You2, Zhen Wang2, You Wang1,3,6、*, Guang-Can Guo1,4, and Qiang Zhou1,4,7、*
Author Affiliations
  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 2Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 3Southwest Institute of Technical Physics, Chengdu 610041, China
  • 4CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 5e-mail: c.z.yuan@uestc.edu.cn
  • 6e-mail: youwang_2007@aliyun.com
  • 7e-mail: zhouqiang@uestc.edu.cn
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    Figures & Tables(5)
    Conceptual illustration of the HOM interference to reveal the dispersion effect on the indistinguishability between single-photon wave-packets. (a) HOM interferometer with dispersive manipulation modules. Two identical single-photon wave-packets are manipulated with dispersion modules along two optical paths, i.e., path A and path B, and then are sent into an HOM interferometer; (b) HOM interference curves without the second-order dispersion along two paths; (c) with the same second-order dispersion along two paths, i.e., balanced HOM interferometer; (d) with unbalanced second-order dispersions along two paths. To obtain the HOM interference curve, the travel time of the wave-packet in path A is fixed, and that in path B is varied and the time axis is in reference to the center of the pulse in path A. To guide eyes, envelopes of three sub-wave-packets are depicted with solid and dashed lines in red, green, and blue, respectively, and the black envelope covering the three sub-wave-packets is used to illustrate the widths of the wave-packets.
    Experimental setup. The setup consists of attenuated mode-locked laser pulses, HOM interferometer, and photon detection with a dispersion module. VOA, variable optical attenuator; SMC, single-mode fiber coupler; PBS, polarization beam splitter; PMC, polarization-maintaining fiber coupler; PC, polarization controller; SNSPD, superconducting nanowire single photon detector; TDC, time to digital convertor.
    HOM interference curves (a) without a dispersion module, and (b) with 50 km long fiber as the dispersion module at the output of the mode-locked laser, respectively. The blue dots are experimental results. The solid purple lines are Gaussian fitting curves obtained via Monte Carlo method with 1000-time random sampling around each measured data assumed as Poissonian distribution.
    HOM interference curves with a 80 m long single-mode fiber inserted in one path, which corresponds to 16 periods of mode-locked laser pulses.
    (a) Output of a mode-locked pulse laser, measured by a second-order autocorrelator. (b) Output of a mode-locked pulse laser after the dispersive manipulation, recorded by the single-photon detection and a TDC.
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    Yun-Ru Fan, Chen-Zhi Yuan, Rui-Ming Zhang, Si Shen, Peng Wu, He-Qing Wang, Hao Li, Guang-Wei Deng, Hai-Zhi Song, Li-Xing You, Zhen Wang, You Wang, Guang-Can Guo, Qiang Zhou. Effect of dispersion on indistinguishability between single-photon wave-packets[J]. Photonics Research, 2021, 9(6): 1134

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    Paper Information

    Category: Quantum Optics

    Received: Feb. 2, 2021

    Accepted: Apr. 9, 2021

    Published Online: Jun. 1, 2021

    The Author Email: Chen-Zhi Yuan (c.z.yuan@uestc.edu.cn), You Wang (youwang_2007@aliyun.com), Qiang Zhou (zhouqiang@uestc.edu.cn)

    DOI:10.1364/PRJ.421180

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