4.6 Article

Visible-wavelength polarization-entangled photon source for quantum communication and imaging

Journal

APPLIED PHYSICS LETTERS
Volume 120, Issue 7, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0069992

Keywords

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Funding

  1. European Union [801060]
  2. Fraunhofer LIGHTHOUSE PROJECT (QUILT)
  3. Fraunhofer Attract program (QCtech)

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In this study, a polarization-entangled photon pair source operating in the visible light range is presented, with high brightness and quantum state fidelity. By studying the trade-off between source brightness and entanglement visibility, application cases for different filtering configurations are proposed, achieving higher brightness.
We present a polarization-entangled photon pair source operating in the visible light range around 532 nm. Employing a collinear crossed-crystal scheme with type-I degenerate phase matching in barium borate (BBO), our source achieves a brightness of 9.5 k pairs/s/mW and a quantum state fidelity of 98.3%, making it a candidate for integration in microscopes and make use of the advantages of mid-visible optimized single-photon detection technologies. In order to study potential applications, we present a trade-off between source brightness and polarization entanglement visibility and propose use cases for different filtering configurations of the source, capable of a brightness up to 1.23 M pairs/s/mW. (C) 2022 Author(s).

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