Polarization-entangled photon pairs with factorable spectra engineered by using an uneven four-stage nonlinear interferometer

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外文摘要：We report the generation of polarization-entangled photon pairs in the 1550 nm band by pumping an uneven nonlinear interferometer loop with two orthogonally polarized counterpropagating pump pulses.The uneven nonlinear interferom-eter,providing a more ideal interference pattern due to the elimination of secondary maxima,consists of four pieces of dispersion-shifted fibers sandwiched with three pieces of standard single-mode fibers,and the lengths of the nonlinear fibers follow the binomial distribution.The mode number of the photon pairs deduced from the measured joint spectrum is～1.03.The collection efficiency of the photon pairs is found to be～94％[after background noise correction].The directly measured visibility of two-photon interference of the polarization-entangled photon pairs is～92％,while no interference is observed in the direct detection of either the signal or idler photons.

外文关键词：

polarization-entangled photon pairsnonlinear interferometerquantum state engineeringoptical fiber

作者：

崔亮、陈浩然、李嘉敏、李小英

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作者单位：

College of Precision Instrument and 0pto-Electronics Engineering,Key Laboratory of 0pto-Electronics Information Technology,Ministry of Education,Tianjin University,Tianjin 300072,China

School of Physics,Taiyuan University of Technology,Taiyuan 030000,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

12074283918363021187427962305240

出版年：

2024

DOI：

10.3788/COL202422.052701

中国光学快报(英文版)

中国光学学会中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD

影响因子：1.305

ISSN：1671-7694

年,卷(期)：2024.22(5)