Abstract
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.
Highlights
Another important benefit of short wavelength operation is the widespread availability of efficient single photon avalanche diodes (SPADs) with very high timing resolution at wavelengths near 550 nm
We present a polarization-entangled photon pair source operating in the visible light range around 532 nm
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
Summary
Adria Sansa Perna,1,a) Evelyn Ortega,[2] Markus Gra€fe,[1,3] and Fabian Steinlechner[1,3]
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