Entanglement and nonlocality between disparate solid-state quantum memories mediated by photons
Marcel Li Grimau Puigibert (University of Basel, University of Calgary)
Mohsen Falamarzi Askarani (Kavli institute of nanoscience Delft, TU Delft - QID/Tittel Lab, University of Calgary)
Jacob H. Davidson (TU Delft - QID/Tittel Lab, University of Calgary, Kavli institute of nanoscience Delft)
Varun B. Verma (National Institute of Standards and Technology)
Matthew D. Shaw (California Institute of Technology)
Sae Woo Nam (National Institute of Standards and Technology)
Thomas Lutz (University of Calgary, ETH Zürich)
Gustavo Castro Amaral (TU Delft - BUS/TNO STAFF, University of Calgary)
Daniel Oblak (University of Calgary)
Wolfgang Tittel (Kavli institute of nanoscience Delft, TU Delft - Quantum Communications Lab, University of Calgary, TU Delft - QID/Tittel Lab)
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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 g12(2)=53±8; entanglement preserving storage with input-output fidelity of FIO≈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.
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