David Elkouss Towards long distance quantum communications Where - - PowerPoint PPT Presentation

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Dec 12, 2023 326 likes •464 views

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,

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David Elkouss

Towards long distance quantum communications

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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

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Trusted repeater networks

Sasaki et al. Optics express 19 (2011)

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Entanglement over a distance of > 1200km via satellite

Pan Group, Science, July 2017

Where are we? State of the art with free-space communications

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Towards long distance

Transmission probability: ! " = 10& ⁄

( )

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Summary

Repeaters can bridge long distances
Entanglement distillation
Difficult optimization problem