High-performance quantum entanglement generation via cascaded second-order nonlinear processes

Abstract In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic gene...

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Autores principales:	Zichang Zhang, Chenzhi Yuan, Si Shen, Hao Yu, Ruiming Zhang, Heqing Wang, Hao Li, You Wang, Guangwei Deng, Zhiming Wang, Lixing You, Zhen Wang, Haizhi Song, Guangcan Guo, Qiang Zhou
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/d21ccbaaf4c345ecacf73fe9582c07f7
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spelling	oai:doaj.org-article:d21ccbaaf4c345ecacf73fe9582c07f72021-12-02T17:06:30ZHigh-performance quantum entanglement generation via cascaded second-order nonlinear processes10.1038/s41534-021-00462-72056-6387https://doaj.org/article/d21ccbaaf4c345ecacf73fe9582c07f72021-08-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00462-7https://doaj.org/toc/2056-6387Abstract In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC), to generate photon-pairs. Previously, the performance of the photon-pairs is contaminated by Raman noise photons. Here by fiber-integrating the PPLN waveguide with noise-rejecting filters, we obtain a coincidence-to-accidental ratio (CAR) higher than 52,600 with photon-pair generation and detection rate of 52.36 kHz and 3.51 kHz, respectively. Energy-time, frequency-bin, and time-bin entanglement is prepared by coherently superposing correlated two-photon states in these degrees of freedom, respectively. The energy-time entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.71 ± 0.02 with two-photon interference visibility of 95.74 ± 0.86%. The frequency-bin entangled two-photon states achieve fidelity of 97.56 ± 1.79% with a spatial quantum beating visibility of 96.85 ± 2.46%. The time-bin entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.60 ± 0.04 and quantum tomographic fidelity of 89.07 ± 4.35%. Our results provide a potential candidate for the quantum light source in quantum photonics.Zichang ZhangChenzhi YuanSi ShenHao YuRuiming ZhangHeqing WangHao LiYou WangGuangwei DengZhiming WangLixing YouZhen WangHaizhi SongGuangcan GuoQiang ZhouNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Zichang Zhang Chenzhi Yuan Si Shen Hao Yu Ruiming Zhang Heqing Wang Hao Li You Wang Guangwei Deng Zhiming Wang Lixing You Zhen Wang Haizhi Song Guangcan Guo Qiang Zhou High-performance quantum entanglement generation via cascaded second-order nonlinear processes
description	Abstract In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC), to generate photon-pairs. Previously, the performance of the photon-pairs is contaminated by Raman noise photons. Here by fiber-integrating the PPLN waveguide with noise-rejecting filters, we obtain a coincidence-to-accidental ratio (CAR) higher than 52,600 with photon-pair generation and detection rate of 52.36 kHz and 3.51 kHz, respectively. Energy-time, frequency-bin, and time-bin entanglement is prepared by coherently superposing correlated two-photon states in these degrees of freedom, respectively. The energy-time entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.71 ± 0.02 with two-photon interference visibility of 95.74 ± 0.86%. The frequency-bin entangled two-photon states achieve fidelity of 97.56 ± 1.79% with a spatial quantum beating visibility of 96.85 ± 2.46%. The time-bin entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.60 ± 0.04 and quantum tomographic fidelity of 89.07 ± 4.35%. Our results provide a potential candidate for the quantum light source in quantum photonics.
format	article
author	Zichang Zhang Chenzhi Yuan Si Shen Hao Yu Ruiming Zhang Heqing Wang Hao Li You Wang Guangwei Deng Zhiming Wang Lixing You Zhen Wang Haizhi Song Guangcan Guo Qiang Zhou
author_facet	Zichang Zhang Chenzhi Yuan Si Shen Hao Yu Ruiming Zhang Heqing Wang Hao Li You Wang Guangwei Deng Zhiming Wang Lixing You Zhen Wang Haizhi Song Guangcan Guo Qiang Zhou
author_sort	Zichang Zhang
title	High-performance quantum entanglement generation via cascaded second-order nonlinear processes
title_short	High-performance quantum entanglement generation via cascaded second-order nonlinear processes
title_full	High-performance quantum entanglement generation via cascaded second-order nonlinear processes
title_fullStr	High-performance quantum entanglement generation via cascaded second-order nonlinear processes
title_full_unstemmed	High-performance quantum entanglement generation via cascaded second-order nonlinear processes
title_sort	high-performance quantum entanglement generation via cascaded second-order nonlinear processes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d21ccbaaf4c345ecacf73fe9582c07f7
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_version_	1718381586011914240

High-performance quantum entanglement generation via cascaded second-order nonlinear processes

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