Chinese Optics Letters, Volume. 19, Issue 5, 052702(2021)

Engineering the spectral profile of photon pairs by using multi-stage nonlinear interferometers

Mingyi Ma, Liang Cui, and Xiaoying Li*
Author Affiliations
  • College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-Electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
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    Figures & Tables(4)
    (a) Experimental setup of generating photon pairs from an N-stage nonlinear interferometer (NLI) consisting of N pieces of nonlinear media of dispersion shifted fibers (DSFs) and N−1 pieces of phase shifters of standard single mode fibers (SMFs). DBF, dual-band filter; FPC, fiber polarization controller; FPBS, fiber polarization beam splitter; SPD, single photon detector; DAQ, data acquisition system. (b) The contour of JSI |F(ωs,ωi)|2 for photon pairs generated from a single piece of DSF.
    Results for N-stage NLI with N = 2, 3, 4 when the lengths of each DSF and SMF in the NLI are 100 m and 10 m, respectively. (a), (b) The contours of interference factor |H(θ)|2 and JSI |FNLIS(ωs,ωi)|2 calculated by substituting experimental parameters into Eqs. (2) and (1), respectively. (c) Contour maps of measured true coincidence of photon pairs, which reflect the JSI of photon pairs. (d) Measured (dots) and calculated (solid curves) marginal intensity distributions of signal photons.
    Measured counting rate (dots) Rs as a function of the average pump power Pa for the photons in an individual signal band centering at (a) 1560.4 nm and (b) 1561.9 nm, respectively. The solid curve Rs=s1Pa+s2Pa2 is the fitting function of raw data (dots); dashed and dotted lines are the linear term s1Pa and quadratic term s2Pa2, respectively.
    Results for uneven N-stage NLI, in which the lengths of DSFs, labelled in the top for different stage number N, follow binomial distribution. (a), (b) The calculated contours of interference factor |K(θ)|2/L12 and JSI |FNLI(UN)(ωs,ωi)|2 [see Eqs. (5) and (6)], respectively. (c) Contour maps of true coincidence of photon pairs, reflecting the JSI of photon pairs. (d) Measured (dots) and calculated (solid curves) marginal intensity distributions of signal photons.
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    Mingyi Ma, Liang Cui, Xiaoying Li. Engineering the spectral profile of photon pairs by using multi-stage nonlinear interferometers[J]. Chinese Optics Letters, 2021, 19(5): 052702

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    Paper Information

    Category: Quantum Optics and Quantum Information

    Received: Aug. 7, 2020

    Accepted: Nov. 20, 2020

    Posted: Nov. 23, 2020

    Published Online: Mar. 18, 2021

    The Author Email: Xiaoying Li (xiaoyingli@tju.edu.cn)

    DOI:10.3788/COL202119.052702

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