Experimental storage of photonic polarization entanglement in a broadband cyclical quantum memory
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2023-06-16
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Attribution 4.0 International (CC BY 4.0)
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.