Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Advanced Photonics

High-purity, Broadband, Entangled Photon Pairs Generated in Poled Silica Fibers

Eric Y. Zhu, Li Qian, Costantino Corbari, Alexey V. Gladyshev, Peter G. Kazansky

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We discuss the various aspects of polarization-entangled photon pair generation in a poled fiber, including the role that fiber birefringence and dispersion play. The broadband nature of the fiber source is demonstrated, and the downconversion spectrum is measured.
DOI
10.1364/bgpp.2014.bw1d.1

Related papers

Poled-fiber source of broadband polarization-entangled photon pairs

E. Y. Zhu, Zhenzhou Tang, Li Qian +7 more

We demonstrate broadband polarization-entangled photon pair generation in a poled fiber phase matched for Type II downconversion in the 1.5 μm telecom band. Even with signal-idler separation greater than 100 nm, we observe fringe visibilities greater than 97% and tangle greater than 0.8. A Hong-Ou-Mandel interference experiment is also used to experimentally confirm the broadband nature of the entanglement.

Optics Letters•Oct 22, 2013•35 citations

Poled-Fiber Source of Polarization-Entangled Photon Pairs

E. Y. Zhu, Zhenzhou Tang, Li Qian +7 more

We demonstrate broadband telecom-wavelength polarization-entangled photon pair generation in a periodically-poled silica fiber (PPSF). Two-photon interference visibility exceeds 90%, and Bell’s inequality is violated by 8 standard deviations.

Advanced Photonics•Jan 1, 2011•1 citation

Type II Parametric Downconversion in a Poled Fiber

Eric Y. Zhu, E. A. Lee Kim-Koon, Li Qian +7 more

We report photon-pair generation at the 1.5- m telecom band via continuous-wave type-II parametric downconversion in a birefringent periodically-poled silica fiber. The time- and polarization-correlations of the downconverted light are examined.

•Jan 1, 2011•0 citations

Nonlinear Frequency Generation in Poled Fibers: From Sum-Frequency to Polarization-Entangled Photon Pairs

Li Qian, Eric Y. Zhu, Zhiyuan Tang

We review recent progress in nonlinear frequency generation in periodically-poled silica fibers (PPSFs). Using a birefringent PPSF, we enable spectrally-separate type-II quasi-phase-matching and demonstrate both polarization-dependent sum-frequency generation and direct polarization-entangled photon pair generation.

OSA Advanced Photonics Congress•Jan 1, 2012•0 citations

Entangled Photon Pair Sources based on Periodically Poled Silica Fiber

Changjia Chen

Entangled photons are a fundamental resource in quantum applications. Broadband entangled photon sources have been used in applications such as high-resolution quantum sensing and wavelength-multiplexed quantum communication. In particular, in fiber-based quantum applications such as long-distance quantum clock synchronization and quantum key distribution in deployed fiber networks, a practical entangled source that is robust and compatible with silica fiber is highly sought after. Periodically poled silica fiber (PPSF) has been demonstrated to be a promising resource of entangled photon-pairs. PPSF uses the induced second-order nonlinearity in poled fiber to generate polarization-entangled photon pairs based on type-II spontaneous parametric down-conversion. The negligible group birefringence of the PPSF ensures high-quality and broadband polarization entanglement without compensation, making it particularly suitable for these quantum applications. The PPSF-based source has a lot of potentials to be tapped because of its high entanglement quality, broadband emission bandwidth, simple structure, and its compatibility with the existing fiber infrastructure. In this thesis, I focus on the development of the PPSF-based entangled photon sources. I first investigate the design and the manufacturing process of the PPSF where I try to produce PPSF with improved performance and innovative properties. Next, I study the compensation-free nature of the PPSF-based polarization entanglement source and discuss the interplay between dispersion, birefringence, emission bandwidth, and polarization entanglement. Based on the theory, a commercial PPSF-based photon-pair source prototype is developed and patented. It has to my knowledge the simplest design of all polarization-entangled sources reported so far in the literature. Furthermore, I broaden the biphoton bandwidth by building a PPSF photon-pair source that emits biphotons at telecom O-band. With more than 24THz bandwidth, the biphotons generated in this source are the broadest of all O-band polarization-entangled photon sources reported to my knowledge. I also propose and experimentally demonstrate a polarization-frequency hyperentangled photon source using PPSF, which provides higher dimensionality by making use of entanglement in multiple degrees of freedom. Overall, this thesis contributes to the development of PPSF technology for practical quantum applications. I anticipate that the PPSF-based photon-pair source will play an important role in the era of quantum technology.

•Jun 1, 2022•0 citations

From Type II Upconversion to SPDC: A Path to Broadband Polarization Entanglement in Poled Fibers

Eric Y. Zhu, L. G. Helt, Marco Liscidini +6 more

We report type II sum-frequency and second-harmonic generation in a 24-cm-long periodically-poled silica fiber. Quasi-phase matching is achieved for orthogonally-polarized signal and idler over 1520-1575 nm, demonstrating the path to in-fiber broadband polarization-entangled photon pair generation.

Conference on Lasers and Electro-Optics•Jan 1, 2009•0 citations
Entangled photons are a fundamental resource in quantum applications. Broadband entangled photon sources have been used in applications such as high-resolution quantum sensing and wavelength-multiplexed quantum communication. In particular, in fiber-based quantum applications such as long-distance quantum clock synchronization and quantum key distribution in deployed fiber networks, a practical entangled source that is robust and compatible with silica fiber is highly sought after. Periodically poled silica fiber (PPSF) has been demonstrated to be a promising resource of entangled photon-pairs. PPSF uses the induced second-order nonlinearity in poled fiber to generate polarization-entangled photon pairs based on type-II spontaneous parametric down-conversion. The negligible group birefringence of the PPSF ensures high-quality and broadband polarization entanglement without compensation, making it particularly suitable for these quantum applications. The PPSF-based source has a lot of potentials to be tapped because of its high entanglement quality, broadband emission bandwidth, simple structure, and its compatibility with the existing fiber infrastructure. In this thesis, I focus on the development of the PPSF-based entangled photon sources. I first investigate the design and the manufacturing process of the PPSF where I try to produce PPSF with improved performance and innovative properties. Next, I study the compensation-free nature of the PPSF-based polarization entanglement source and discuss the interplay between dispersion, birefringence, emission bandwidth, and polarization entanglement. Based on the theory, a commercial PPSF-based photon-pair source prototype is developed and patented. It has to my knowledge the simplest design of all polarization-entangled sources reported so far in the literature. Furthermore, I broaden the biphoton bandwidth by building a PPSF photon-pair source that emits biphotons at telecom O-band. With more than 24THz bandwidth, the biphotons generated in this source are the broadest of all O-band polarization-entangled photon sources reported to my knowledge. I also propose and experimentally demonstrate a polarization-frequency hyperentangled photon source using PPSF, which provides higher dimensionality by making use of entanglement in multiple degrees of freedom. Overall, this thesis contributes to the development of PPSF technology for practical quantum applications. I anticipate that the PPSF-based photon-pair source will play an important role in the era of quantum technology.