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

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

doi:10.1103/PhysRevLett.108.213902

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

Eric Y. Zhu^*, Zhiyuan Tang, Li Qian, Lukas G. Helt, Marco Liscidini, J. E. Sipe, Costantino Corbari, Albert Canagasabey, Morten Ibsen, Peter G. Kazansky

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

Abstract

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.

Original language	English
Article number	213902
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review Letters
Volume	108
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.108.213902
Publication status	Published - 21 May 2012
Externally published	Yes

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10.1103/PhysRevLett.108.213902

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title = "Direct generation of polarization-entangled photon pairs in a poled fiber",

abstract = "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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AU - Zhu, Eric Y.

AU - Tang, Zhiyuan

AU - Qian, Li

AU - Helt, Lukas G.

AU - Liscidini, Marco

AU - Sipe, J. E.

AU - Corbari, Costantino

AU - Canagasabey, Albert

AU - Ibsen, Morten

AU - Kazansky, Peter G.

PY - 2012/5/21

Y1 - 2012/5/21

N2 - 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.

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

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