A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides
A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides
We demonstrate a source of polarisation-entangled photons that produces pairs of entangled photons at a rate of 1.25 gigahertz. Our system is enabled by Periodically Poled Lithium Niobate waveguides that produce degenerate photon-pairs with a centre wavelength of 1560 nm and a 0.1 nm bandwidth. We measured the degree of entanglement and obtained a CHSH parameter of 2.73. From measurements of polarisation discrimination in a BB84 protocol with two mutually unbiased bases, we obtained a measurement fidelity of 98% and estimated the maximum secure key rate to be 0.633 gigabits per second.
Ndagano, Bienvenu
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Pandiyan, Krish
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Wright, Lewis
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Smith, Ruaridh
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Anwar, Ali
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Astill, Andy
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Gawith, Corin
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McKnight, Loyd
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30 January 2024
Ndagano, Bienvenu
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Pandiyan, Krish
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Wright, Lewis
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Smith, Ruaridh
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Anwar, Ali
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Astill, Andy
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Gawith, Corin
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McKnight, Loyd
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Ndagano, Bienvenu, Pandiyan, Krish, Wright, Lewis, Smith, Ruaridh, Anwar, Ali, Astill, Andy, Gawith, Corin and McKnight, Loyd
(2024)
A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides.
In Conference 12911 Quantum Computing, Communication, and Simulation IV.
SPIE..
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Conference or Workshop Item
(Paper)
Abstract
We demonstrate a source of polarisation-entangled photons that produces pairs of entangled photons at a rate of 1.25 gigahertz. Our system is enabled by Periodically Poled Lithium Niobate waveguides that produce degenerate photon-pairs with a centre wavelength of 1560 nm and a 0.1 nm bandwidth. We measured the degree of entanglement and obtained a CHSH parameter of 2.73. From measurements of polarisation discrimination in a BB84 protocol with two mutually unbiased bases, we obtained a measurement fidelity of 98% and estimated the maximum secure key rate to be 0.633 gigabits per second.
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Published date: 30 January 2024
Venue - Dates:
SPIE Photonics West 2024, The Moscone Center, San Francisco, United States, 2024-01-27 - 2024-02-01
Identifiers
Local EPrints ID: 487585
URI: http://eprints.soton.ac.uk/id/eprint/487585
PURE UUID: 2575fe24-90ff-457f-9c7d-c4fa648c0fb0
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Date deposited: 27 Feb 2024 20:48
Last modified: 18 Mar 2024 02:51
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Contributors
Author:
Bienvenu Ndagano
Author:
Krish Pandiyan
Author:
Lewis Wright
Author:
Ruaridh Smith
Author:
Ali Anwar
Author:
Andy Astill
Author:
Loyd McKnight
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