Does anybody here take quantum crypto seriously? Just wondering. I do not see any benefit over classical methods. If one trusts the entire link and knows it's not MitM'd in advance, what advantage if any does quantum key distribution have over ordinary methods? And isn't it just as useless otherwise as the ordinary methods?
- Sent from my tablet Den 18 sep 2012 17:20 skrev <d...@geer.org>: > > http://www.qcrypt.net/docs/extended-abstracts/qcrypt2012_submission_12.pdf > > QCrypt, Singapore, 12 September 2012 > > Air to Ground Quantum Key Distribution > > Sebastian Nauerth1, Florian Moll, Markus Rau1, Christian Fuchs, > Joachim Horwath and Harald Weinfurter1 > > The range of quantum key distribution (QKD) systems is known to be > limited to a few hundreds of km due to the attenuation of the channel > and the finite signal to noise ratio of available detectors. Satellite > based systems, however, could provide efficient links for global > scale QKD. While both classical satellite downlinks and long range > terrestrial free-space QKD were shown successfully, a quantum key > exchange with a rapidly moving platform is still missing. Here we > report on the first experimental demonstration of a BB84 QKD > transmission from an airplane at a speed of 290 km/h to ground. Our > system uses attenuated laser pulses with a mean photon number of > mu=0.5 and polarization encoding. Over a distance of 20 km a stable > link was achieved for 10 min yielding a sifted key rate of 145 > bits/s with a quantum bit error rate (QBER) of 4.8 %. > > _______________________________________________ > cryptography mailing list > cryptography@randombit.net > http://lists.randombit.net/mailman/listinfo/cryptography >
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