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Compensation-free broadband entangled photon pair sources

Compensation-free broadband entangled photon pair sources
Compensation-free broadband entangled photon pair sources
Quantum sources that provide broadband biphotons entangled in both polarization and time-energy degrees of freedom are a rich quantum resource that finds many applications in quantum communication, sensing, and metrology. Creating such a source while maintaining high entanglement quality over a broad spectral range is a challenge, which conventionally requires various compensation steps to erase temporal, spectral, or spatial distinguishabilities. Here, we point out that in fact compensation is not always necessary. The key to generate broadband polarization-entangled biphotons via type-II spontaneous parametric downcoversion (SPDC) without compensation is to use nonlinear materials with sufficiently low group birefringence that the biphoton bandwidth becomes dispersion-limited. Most nonlinear crystals or waveguides cannot meet this condition, but it is easily met in fiber-based systems. We reveal the interplay of group birefringence and dispersion on SPDC bandwidth and polarization entanglement quality. We show that periodically poled silica fiber (PPSF) is an ideal medium to generate high-concurrence (>0.977) polarization-entangled photons over a broad spectral range (>77nm), directly and without compensation. This is the highest polarization-entanglement concurrence reported that is maintained over a broad spectral range from a compensation-free source.
1094-4087
22667-22678
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9

Ibsen, Morten (2017) Compensation-free broadband entangled photon pair sources. Optics Express, 27 (19), 22667-22678. (doi:10.1364/OE.25.022667).

Record type: Article

Abstract

Quantum sources that provide broadband biphotons entangled in both polarization and time-energy degrees of freedom are a rich quantum resource that finds many applications in quantum communication, sensing, and metrology. Creating such a source while maintaining high entanglement quality over a broad spectral range is a challenge, which conventionally requires various compensation steps to erase temporal, spectral, or spatial distinguishabilities. Here, we point out that in fact compensation is not always necessary. The key to generate broadband polarization-entangled biphotons via type-II spontaneous parametric downcoversion (SPDC) without compensation is to use nonlinear materials with sufficiently low group birefringence that the biphoton bandwidth becomes dispersion-limited. Most nonlinear crystals or waveguides cannot meet this condition, but it is easily met in fiber-based systems. We reveal the interplay of group birefringence and dispersion on SPDC bandwidth and polarization entanglement quality. We show that periodically poled silica fiber (PPSF) is an ideal medium to generate high-concurrence (>0.977) polarization-entangled photons over a broad spectral range (>77nm), directly and without compensation. This is the highest polarization-entanglement concurrence reported that is maintained over a broad spectral range from a compensation-free source.

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Accepted/In Press date: 1 September 2017
e-pub ahead of print date: 8 September 2017
Published date: 18 September 2017
Additional Information: Discussed with Nicki/Isobel, please apply gold exception.

Identifiers

Local EPrints ID: 432084
URI: https://eprints.soton.ac.uk/id/eprint/432084
ISSN: 1094-4087
PURE UUID: e33b0a5b-3ade-455a-a32d-6481842da1e8

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Date deposited: 01 Jul 2019 16:30
Last modified: 09 Dec 2019 17:35

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