Private entanglement over arbitrary distances, even using noisy apparatus

Details Private entanglement over arbitrary distances, even using noisy apparatus Private entanglement over arbitrary distances, even using noisy apparatus

2000-08-10

arxiv.org/abs/quant-ph/0008051v3

Physics

Quantum Physics

Title changed. Accepted for publication in Physical Review Letters

Scientific paper

We give a security proof of quantum cryptography based entirely on entanglement purification. Our proof applies to all possible attacks (individual and coherent). It implies the security of cryptographic keys distributed with the help of entanglement-based quantum repeaters. We prove the security of the obtained quantum channel which may not only be used for quantum key distribution, but also for secure, albeit noisy, transmission of quantum information.

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