Optimised Domain-engineered Crystals for Pure Telecom Photon Sources

• URL: http://arxiv.org/abs/2101.08280v1
• Date: Wed, 20 Jan 2021 19:00:04 GMT
• Title: Optimised Domain-engineered Crystals for Pure Telecom Photon Sources
• Authors: Alexander Pickston, Francesco Graffitti, Peter Barrow, Christopher Morrison, Joseph Ho, Agata M. Bra\'nczyk, Alessandro Fedrizzi
• Abstract summary: 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 $98.6pm1.1%$ without narrow-band filtering.
• Score: 101.18253437732933
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 $98.6\pm1.1\%$ without narrow-band filtering. As a consequence, we reach net heralding efficiencies of up to $67.5\%$, which corresponds to collection efficiencies exceeding $90\%$.

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