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Solid-state quantum memories for quantum repeaters

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Title Solid-state quantum memories for quantum repeaters
Title of Series The Annual Conference on Quantum Cryptography (QCRYPT) 2012
Number of Parts 30
Author Timoney, Nuala
Contributors Centre for Quantum Technologies (CQT)
National University of Singapore (NUS)
License CC Attribution - NonCommercial - NoDerivatives 2.5 Switzerland:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/36680
Publisher Eidgenössische Technische Hochschule (ETH) Zürich
Release Date 2012
Language English

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Subject Area Information technology
Abstract The maximal transmission distance of optical quantum communication is reaching a hard limit imposed by the intrinsic loss of the transmission medium, e.g. optical fibre. A quantum repeater promises to push that limit towards much longer, potentially intercontinental distances. Its implementation relies on the development of efficient and long-lived quantum memories that can store and retrieve the quantum properties of light. Sources of photonic entanglement, tailored for quantum memories, are also necessary and represent a challenging experimental task. I will review the efforts of our group towards the realization of quantum memories based on rare-earth-ion doped crystals (REIC) as well as a matching source of photon pair. This approach has recently allowed us to demonstrate several features that are of great importance for quantum repeaters, and for quantum networks in general. After a brief introduction, I will show how we have successfully entangled two neodymium-doped crystals in a heralded fashion. I will then show how polarization qubits encoded in true single photons can be stored in such crystals, despite their intrinsic birefringence and polarization-dependant absorption. I will finally present an on-demand quantum memory exploiting the long hyperfine coherence time of europium ions to store light for up to 8 ms. Our results highlight the great potential of REIC for quantum repeaters.

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