Optimised domain-engineered crystals for pure telecom photon sources

The ideal photon-pair source for building up multi-qubit states needs to produce indistinguishable photons with high efficiency. Indistinguishability is crucial for minimising errors in two-photon interference, central to building larger states, while high heralding rates will be needed to overcome...

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Bibliographic Details
Published in:Optics express 2021-03, Vol.29 (5), p.6991-7002
Main Authors: Pickston, Alexander, Graffitti, Francesco, Barrow, Peter, Morrison, Christopher L, Ho, Joseph, Brańczyk, Agata M, Fedrizzi, Alessandro
Format: Article
Language:English
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Summary:The ideal photon-pair source for building up multi-qubit states needs to produce indistinguishable photons with high efficiency. Indistinguishability is crucial for minimising errors in two-photon interference, central to building larger states, while high heralding rates will be needed to overcome unfavourable loss scaling. Domain engineering in parametric down-conversion sources negates the need for lossy spectral filtering allowing one to satisfy these conditions inherently within the source design. Here, we present a telecom-wavelength parametric down-conversion photon source that operates on the achievable limit of domain engineering. We generate photons from independent sources which achieve two-photon interference visibilities of up to 98.6 ± 1.1% without narrow-band filtering. As a consequence, we reach net heralding efficiencies of up to 67.5%, which corresponds to collection efficiencies exceeding 90%.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.416843