Towards highly multimode optical quantum memory for quantum repeaters

Pierre Jobez, Nuala Timoney, Cyril Laplane, Jean Etesse, Alban Ferrier, Philippe Goldner, Nicolas Gisin, Mikael Afzelius

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


Long-distance quantum communication through optical fibers is currently limited to a few hundreds of kilometres due to fiber losses. Quantum repeaters could extend this limit to continental distances. Most approaches to quantum repeaters require highly multimode quantum memories in order to reach high communication rates. The atomic frequency comb memory scheme can in principle achieve high temporal multimode storage, without sacrificing memory efficiency. However, previous demonstrations have been hampered by the difficulty of creating high-resolution atomic combs, which reduces the efficiency for multimode storage. In this article we present a comb preparation method that allows one to increase the multimode capacity for a fixed memory bandwidth. We apply the method to a 151Eu3+-doped Y2SiO5 crystal, in which we demonstrate storage of 100 modes for 51 μs using the AFC echo scheme (a delay-line memory) and storage of 50 modes for 0.541 ms using the AFC spin-wave memory (an on-demand memory). We also briefly discuss the ultimate multimode limit imposed by the optical decoherence rate, for a fixed memory bandwidth.

Original languageEnglish
Article number032327
Number of pages9
JournalPhysical Review A: covering atomic, molecular, and optical physics and quantum information
Issue number3
Publication statusPublished - 21 Mar 2016
Externally publishedYes


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