Entanglement and nonlocality between disparate solid-state quantum memories mediated by photons
Abstract
Entangling quantum systems with different characteristics through the exchange of photons is a prerequisite for building future quantum networks. Proving the presence of entanglement between quantum memories for light working at different wavelengths furthers this goal. Here, we report on a series of experiments with a thulium-doped crystal, serving as a quantum memory for 794-nm photons, an erbium-doped fiber, serving as a quantum memory for telecommunication-wavelength photons at 1535 nm, and a source of photon pairs created via spontaneous parametric down-conversion. Characterizing the photons after re-emission from the two memories, we find nonclassical correlations with a cross-correlation coefficient of g(12)((2)) = 53 +/- 8; entanglement preserving storage with input-output fidelity of F-IO approximate to 93 +/- 2%; and nonlocality featuring a violation of the Clauser-Horne-Shimony-Holt Bell inequality with S = 2.6 +/- 0.2. Our proof-of-principle experiment shows that entanglement persists while propagating through different solid-state quantum memories operating at different wavelengths. Show more
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https://doi.org/10.3929/ethz-b-000467900Publication status
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Journal / series
Physical Review ResearchVolume
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American Physical SocietyMore
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