Non-classical correlations over 1250 modes between telecom photons and 979-nm photons stored in 171Yb3+:Y2SiO5

M. Businger, L. Nicolas, T. Sanchez Mejia, A. Ferrier, P. Goldner and Mikael Afzelius ()
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M. Businger: Départment de Physique Appliquée, Université de Genève
L. Nicolas: Départment de Physique Appliquée, Université de Genève
T. Sanchez Mejia: Départment de Physique Appliquée, Université de Genève
A. Ferrier: Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris
P. Goldner: Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris
Mikael Afzelius: Départment de Physique Appliquée, Université de Genève

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Quantum repeaters based on heralded entanglement require quantum nodes that are able to generate multimode quantum correlations between memories and telecommunication photons. The communication rate scales linearly with the number of modes, yet highly multimode quantum storage remains challenging. In this work, we demonstrate an atomic frequency comb quantum memory with a time-domain mode capacity of 1250 modes and a bandwidth of 100 MHz. The memory is based on a Y2SiO5 crystal doped with 171Yb3+ ions, with a memory wavelength of 979 nm. The memory is interfaced with a source of non-degenerate photon pairs at 979 and 1550 nm, bandwidth-matched to the quantum memory. We obtain strong non-classical second-order cross correlations over all modes, for storage times of up to 25 μs. The telecommunication photons propagated through 5 km of fiber before the release of the memory photons, a key capability for quantum repeaters based on heralded entanglement and feed-forward operations. Building on this experiment should allow distribution of entanglement between remote quantum nodes, with enhanced rates owing to the high multimode capacity.

Date: 2022
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DOI: 10.1038/s41467-022-33929-y

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