Quantum crypto reaches 150 km

[Dave Farber <dave () farber net>]

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Date: Fri, 12 Mar 2004 11:46:06 -0500
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From: Monty Solomon <monty () roscom com>
Subject: Quantum crypto reaches 150 km

Quantum crypto reaches 150 km
12 March 2004

A single photon is sent over a 150 km optical link beating the
previous transmission record by 50 km.

Scientists at NEC in Japan claim to have smashed the transmission
distance record for quantum cryptography. The team says it
successfully sent a single photon over a 150-km-long optical fiber
link. This significantly extends the previous record of 100 km, which
was announced in June 2003.

Quantum cryptography uses a stream of single photons to transfer a
secret key between a transmitter and a receiver. Each transmitted bit
of the cryptographic key is encoded upon a single photon. Any attempt
to intercept the key changes the quantum state of the photons, which
reveals the presence of a hacker.

...

http://optics.org/articles/news/10/3/11/1

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