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

Direct generation of polarization-entangled photon pairs in a poled fiber
Direct generation of polarization-entangled photon pairs in a poled fiber
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.
213902-[5pp]
Zhu, Eric
c791d653-84db-47d4-ab9f-cf6ca92e0e6f
Tang, Zhiyuan
e76813ab-80f4-47be-979d-6b6a0a76c785
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3
Helt, Lukas
391d6ec6-0f00-453c-a00e-3a5af4efd17f
Liscidini, Marco
77d70f8f-99da-40e3-a1a6-464049de4ab8
Sipe, J.E.
08c32725-d093-44ce-99ec-889cf4c70ee8
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Canagasabey, Albert
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Ibsen, Morten
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Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Zhu, Eric
c791d653-84db-47d4-ab9f-cf6ca92e0e6f
Tang, Zhiyuan
e76813ab-80f4-47be-979d-6b6a0a76c785
Qian, Li
3e26e957-afd2-407a-8fa8-6f15b0f70ea3
Helt, Lukas
391d6ec6-0f00-453c-a00e-3a5af4efd17f
Liscidini, Marco
77d70f8f-99da-40e3-a1a6-464049de4ab8
Sipe, J.E.
08c32725-d093-44ce-99ec-889cf4c70ee8
Corbari, Costantino
273904e8-5f90-4110-bc17-3d3f2c27d461
Canagasabey, Albert
2710a07f-176d-414d-b8a4-1967639ce31d
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c

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]. (doi:10.1103/PhysRevLett.108.213902).

Record type: Article

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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Published date: 21 May 2012
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 341151
URI: http://eprints.soton.ac.uk/id/eprint/341151
PURE UUID: 6da8b60e-0c81-4f03-8788-98a27a70e5d6

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Date deposited: 16 Jul 2012 15:19
Last modified: 14 Mar 2024 11:35

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Contributors

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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