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Bulletin of the American Physical Society

Photonic quantum memories for quantum repeaters

Christoph Simon, Nicolas Sangouard, Hugues de Riedmatten, Mikael Afzelius, Hugo Zbinden, Nicolas Gisin

Published Mar 8, 2007• 0 citations
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The implementation of quantum memory, i.e. a quantum interface between light and matter, is central to advanced applications of quantum information processing and communication [1]. Notably, quantum memories are key ingredients in quantum repeaters [2], which promise extending quantum communication beyond its current distance limit. After a brief review of the working principle of a quantum repeater and the state-of-the-art of experimental investigations into quantum memory, we will present the reversible transfer of photon-photon entanglement into entanglement between a photon and an excitation in a thulium-doped lithium-niobate waveguide cooled to 3K. Our finding constitutes an important step towards quantum repeaters and fully quantum-enabled networks.
Due to the inevitable loss of single photon transmission in optical fiber, a quantum repeater scheme is needed to establish large-scale quantum networks. The existing elementary quantum repeater links are all based on emissive quantum memories, with entangled photons emitted by the memory itself. This architecture is difficult to support deterministic photon emission and multiplexing storage simultaneously, which fundamentally limits the rate of entanglement distribution. In this talk, I will present our recent work about the realization of heralded quantum entanglement between two absorptive quantum memories based on rare-earth-ion-doped crystals. This work confirmed the feasibility of constructing quantum repeater based on absorptive quantum memories and demonstrated the acceleration effect of multiplexing in quantum repeater for the first time, which lays a solid foundation for the construction of practical high-speed quantum networks.