| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Generation of spectrally uncorrelated biphotons via fiber nonlinear quantum interference |
| Zhengtong Wei(卫正统), Chuan Qu(瞿川), Tian'an Wu(吴天安), Yuanyuan Li(李媛媛), Bo Li(李博), and Shenghai Zhang(张胜海)† |
| College of Basic Department, Information Engineering University, Zhengzhou 450000, China |
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Abstract Spectrally uncorrelated biphotons are the essential resources for achieving various quantum information processing protocols. We theoretically investigate the generation of spectrally uncorrelated biphotons emitted by spontaneous four-wave mixing from a fiber nonlinear interferometer which consists of an N-stage nonlinear gain fiber and an (N-1)-stage dispersion modulation fiber. The output biphoton states of nonlinear interference are the coherent superposition of various biphoton states born in each nonlinear fiber, and thus the interference fringe will reshape the biphoton joint spectra. As a result, resorting to Taylor expansion to first order for phase mismatching, we theoretically verify that the orientation of phase matching contours will rotate in a specific way with only varying the length of dispersion modulation fiber. The rotation in orientation of phase matching contours may result in spectrally uncorrelated biphotons and even arbitrary correlation biphotons. Further, we choose micro/nanofiber as the nonlinear gain fiber and single-mode communication fiber as dispersion modulation fiber to numerically simulate the generation of spectrally uncorrelated biphotons from spontaneous fourwave mixing. Here, due to significant frequency detuning (hundreds of THz), Raman background noise can be considerably suppressed, even at room temperature, and photons with largely tunable wavelengths can be achieved, indicating a practicability in many quantum fields. A photon mode purity of 97.2% will be theoretically attained without weakening the heralding nature of biphoton sources. We think that this fiber nonlinear interference with the flexibly engineered quantum state can be an excellent practical source for quantum information processing.
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Received: 05 December 2022
Revised: 18 January 2023
Accepted manuscript online: 31 January 2023
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PACS:
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42.50.Dv
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(Quantum state engineering and measurements)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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42.65.Lm
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(Parametric down conversion and production of entangled photons)
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42.81.-i
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(Fiber optics)
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| Fund: Project supported by the Science and Technology Key Project of Henan Province, China (Grant No. 182102210577), and the National Natural Science Foundation of China (Grant No. 61605249). |
Corresponding Authors:
Shenghai Zhang
E-mail: Ccstshz@163.com
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Cite this article:
Zhengtong Wei(卫正统), Chuan Qu(瞿川), Tian'an Wu(吴天安), Yuanyuan Li(李媛媛), Bo Li(李博), and Shenghai Zhang(张胜海) Generation of spectrally uncorrelated biphotons via fiber nonlinear quantum interference 2023 Chin. Phys. B 32 064202
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