A long-lived spectrally multiplexed solid-state optical quantum memory for high-rate quantum repeaters
Antariksha Das (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QID/Tittel Lab)
Mohsen F. Askarani (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Tittel Lab, Kavli institute of nanoscience Delft)
Jacob H. Davidson (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Tittel Lab)
Gustavo C. Amaral (TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF, Kavli institute of nanoscience Delft)
Neil Sinclair (Harvard School of Engineering and Applied Sciences, California Institute of Technology)
Joshua A. Slater (TU Delft - BUS/Spider, TU Delft - QuTech Advanced Research Centre)
Sara Marzban (Kavli institute of nanoscience Delft, TU Delft - QID/Tittel Lab, TU Delft - QuTech Advanced Research Centre)
Daniel Oblak (University of Calgary)
Wolfgang Tittel (TU Delft - Quantum Communications Lab, Schaffhausen Institute of Technology - SIT, TU Delft - QID/Tittel Lab, Kavli institute of nanoscience Delft, Université de Genève, TU Delft - QuTech Advanced Research Centre)
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Abstract
Long optical storage times are an essential requirement to establish high-rate entanglement distribution over large distances using memory-based quantum repeaters. Rare earth ion-doped crystals are arguably well-suited candidates for building such quantum memories. Toward this end, we investigate the 795.32 nm 3H6 ↔ 3H4 transition of 1% thulium-doped yttrium gallium garnet crystal (Tm3+:Y3Ga5O12 : Tm3+:YGG). Most essentially, we find that the optical coherence time can reach 1.1 ms, and, using laser pulses, we demonstrate optical storage based on the atomic frequency comb (AFC) protocol up to 100 µs. In addition, we demonstrate multiplexed storage, including feed-forward selection, shifting, and filtering of spectral modes, as well as quantum state storage using members of non-classical photon pairs. Our results show that Tm:YGG can be a potential candidate for creating multiplexed quantum memories with long optical storage times.