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Cryogenic Degenerate Spontaneous Parametric Down-Conversion

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Abstract

We show a HOM dip between degenerate signal and idler photons at (1559.33 ± 0.05) nm from cryogenic integrated SPDC in lithium niobate, compatible with superconducting detectors. This is enabled by precise control over the cryogenic phase-matching.

© 2023 The Author(s)

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