Scientific article
Open access

Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal

Published innpj quantum information, vol. 8, no. 1, 29
Publication date2022-03-15
First online date2022-03-15

Long-duration quantum memories for photonic qubits are essential components for achieving long-distance quantum networks and repeaters. The mapping of optical states onto coherent spin-waves in rare earth ensembles is a particularly promising approach to quantum storage. However, it remains challenging to achieve long-duration storage at the quantum level due to read-out noise caused by the required spin-wave manipulation. In this work, we apply dynamical decoupling techniques and a small magnetic field to achieve the storage of six temporal modes for 20, 50, and 100 ms in a 151 Eu 3+ :Y 2 SiO 5 crystal, based on an atomic frequency comb memory, where each temporal mode contains around one photon on average. The quantum coherence of the memory is verified by storing two time-bin qubits for 20 ms, with an average memory output fidelity of F  = (85 ± 2)% for an average number of photons per qubit of μ in  = 0.92 ± 0.04. The qubit analysis is done at the read-out of the memory, using a type of composite adiabatic read-out pulse we developed.

Citation (ISO format)
ORTU, Antonio et al. Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal. In: npj quantum information, 2022, vol. 8, n° 1, p. 29. doi: 10.1038/s41534-022-00541-3
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Article (Published version)
ISSN of the journal2056-6387

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