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Direct generation of polarization-entangled photon pairs in a poled fiber

Zhu, Eric, Tang, Zhiyuan, Qian, Li, Helt, Lukas, Liscidini, Marco, Sipe, J.E., Corbari, Costantino, Canagasabey, Albert, Ibsen, Morten and Kazansky, Peter (2012) Direct generation of polarization-entangled photon pairs in a poled fiber Physical Review Letters, 108, (21), 213902-[5pp].

Record type: Article


We experimentally demonstrate the direct generation of polarization-entangled photon pairs in an optical fiber at room temperature by exploiting type-II phase-matched spontaneous parametric down-conversion. A second-order nonlinearity is artificially induced in the 17-cm-long weakly birefringent step-index fiber through the process of thermal poling, and quasi-phase-matching allows for the generation of entangled photons in the 1.5-micron telecom band when the fiber is pumped at 775 nm. A greater-than 80:1 coincidence-to-accidental ratio is achieved, limited mainly by multiphoton pair generation. Without the need to subtract accidentals or to compensate for walk-off, the raw two-photon interference visibility is found to be better than 95%, and violation of Bell’s inequality is observed by more than 18 standard deviations. This makes for a truly alignment-free, plug-and-play source of polarization-entangled photon pairs.

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Published date: 21 May 2012
Organisations: Optoelectronics Research Centre


Local EPrints ID: 341151
PURE UUID: 6da8b60e-0c81-4f03-8788-98a27a70e5d6

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Date deposited: 16 Jul 2012 15:19
Last modified: 09 Oct 2017 10:10

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Author: Eric Zhu
Author: Zhiyuan Tang
Author: Li Qian
Author: Lukas Helt
Author: Marco Liscidini
Author: J.E. Sipe
Author: Costantino Corbari
Author: Albert Canagasabey
Author: Morten Ibsen
Author: Peter Kazansky

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