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Secure key exchange over 1.9 km free-space range using quantum cryptography

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3 Author(s)

Secure key exchange is demonstrated over a 1.9 km free-space range using the technique of quantum cryptography. The system is designed to be robust against transmission losses >20 dB. This is a first step towards exchanging keys to a low earth orbit satellite

Published in:

Electronics Letters  (Volume:37 ,  Issue: 8 )