Broadband Fiber-based Entangled Photon Pair Source at Telecom O-band

Changjia Chen; Calvin Xu; Arash Riazi; Eric Y. Zhu; Alexey V. Gladyshev; Peter G. Kazansky; Li Qian

doi:10.1364/OL.415409

Broadband Fiber-based Entangled Photon Pair Source at Telecom O-band

Quantum Physics 2021-02-26 v1

Authors: Changjia Chen , Calvin Xu , Arash Riazi , Eric Y. Zhu , Alexey V. Gladyshev , Peter G. Kazansky , Li Qian

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Abstract

In this letter, we report a polarization-entangled photon-pair source based on type-II spontaneous parametric down conversion at telecom O-band in periodically poled silica fiber (PPSF). The photon-pair source exhibits more than 130 nm (~24 THz) emission bandwidth centered at 1306.6 nm. The broad emission spectrum results in a short biphoton correlation time and we experimentally demonstrate a Hong-Ou-Mandel interference dip with a full width of 26.6 fs at half maximum. Owing to the low birefringence of the PPSF, the biphotons generated from type-II SPDC are polarization-entangled over the entire emission bandwidth, with a measured fidelity to a maximally entangled state greater than 95.4%. The biphoton source provides the broadest bandwidth entangled biphotons at O-band to our knowledge.

Keywords

photon pair generation

Cite

@article{arxiv.2102.12632,
  title  = {Broadband Fiber-based Entangled Photon Pair Source at Telecom O-band},
  author = {Changjia Chen and Calvin Xu and Arash Riazi and Eric Y. Zhu and Alexey V. Gladyshev and Peter G. Kazansky and Li Qian},
  journal= {arXiv preprint arXiv:2102.12632},
  year   = {2021}
}

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Accepted by Optic Letters

Broadband Fiber-based Entangled Photon Pair Source at Telecom O-band

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