David Elkouss Towards long distance quantum communications
Where are we? State of the art with fiber optics Quantum Cryptography (QKD) – non DI: Key Distribution Status: Commercial at short (~100kms) distances • (idQuantique, Huawei, Toshiba, NEC, Mitsubishi, ….) Lab ~300kms • Grand Challenge: long distance quantum communication • Quantum Cryptography (other protocols): Status: In lab at short distances
Trusted repeater networks Sasaki et al. Optics express 19 (2011)
Where are we? State of the art with free-space communications Entanglement over a distance of > 1200km via satellite Pan Group, Science, July 2017
Towards long distance Transmission probability: ! " = 10 & ⁄ ( )
Summary • Repeaters can bridge long distances • Entanglement distillation • Difficult optimization problem
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