Experimental storage of photonic polarization entanglement in a broadband cyclical quantum memory

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2306.09986.pdf (2.75 MB)

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https://arxiv.org/abs/2306.09986

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https://doi.org/10.48550/arXiv.2306.09986
 http://hdl.handle.net/11603/28731

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UMBC Physics Department
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https://orcid.org/0000-0002-3269-1091
 https://orcid.org/0000-0001-8712-3051

Date

2023-06-16

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journal articles
preprints
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Attribution 4.0 International (CC BY 4.0)

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Abstract

We describe an experiment in which one member of a polarization-entangled photon pair is stored in an active Cyclical Quantum Memory (CQM) device, while the other propagates through a passive optical delay line. A comparison of Bell's inequality tests performed before and after the storage is used to investigate the ability of the CQM to maintain entanglement, and demonstrate a rudimentary entanglement distribution protocol. The entangled photons are produced by a conventional Spontaneous Parametric Down Conversion source with center wavelengths at 780 nm and bandwidths of ∼10 THz, while the CQM has an even wider operational bandwidth that is enabled by the weakly dispersive nature of the Pockels effect used for active switching in a loop-based quantum memory platform.