[cryptography] This talk was held today, at UBC's TRIUMF research facility
rvh40 at insightbb.com
Wed Feb 22 19:56:19 EST 2012
Speaker: Prof. Thomas Jennewein (University of Waterloo, Institute for
Quantum Computing and Department of Physics and Astronomy)
Title: Quantum Encryption and Quantum Science with Satellites
Abstract: Space offers a very unique environment for quantum physics
experiments at regimes for distance and velocity not possible on ground.
In the recent years there have been a range of theoretical and
experimental studies towards the feasibility of performing quantum
physics and quantum information science experiments in space.
The most advanced quantum application is quantum cryptography, or more
correctly known as quantum key distribution (QKD) [Scarani et al.,
Rev.Mod.Phys, 2009]. Thereby, the transmission of individual photons
between two distant users, called Alice and Bob, allows them to create a
highly secure key. Its security stems from the simple fact that the
information stored in individual photons, such as its polarization,
cannot be fully determined due to Heisenberg's uncertainty relation.
Currently, such quantum cryptography systems can reach distances on the
order of 200 kilometers [Waks et al, Phys.Rev.A,2002], limited by the
performance of current optical fibres and single-photon-detectors. One
clear solution for achieving global distances is to bring these quantum
systems into space onto satellites. In addition, quantum satellites in
Earth's orbit, and possibly even beyond that, are able to test the
validity of quantum physics and entanglement on huge length scales and
even give insights into the interplay of quantum physics and relativity.
I will present the objectives and goals of the proposed QEYSSAT mission,
which can accomplish the experimental demonstrations of these concepts
with existing technology on a small-scale satellite. The planned
quantum experiments and their requirements will be shown.
Stimulants available 15 minutes before the talk.
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