Quantum cryptography with entangled photons
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TLDR
A novel key distribution scheme is implemented using Wigner's inequality to test the security of the quantum channel, and a variant of the BB84 protocol is realized.Abstract:
By realizing a quantum cryptography system based on polarization entangled photon pairs we establish highly secure keys, because a single photon source is approximated and the inherent randomness of quantum measurements is exploited. We implement a novel key distribution scheme using Wigner's inequality to test the security of the quantum channel, and, alternatively, realize a variant of the BB84 protocol. Our system has two completely independent users separated by 360 m, and generates raw keys at rates of 400-800 bits/s with bit error rates around 3%.read more
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Quantum entanglement
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The security of practical quantum key distribution
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TL;DR: Essential theoretical tools that have been developed to assess the security of the main experimental platforms are presented (discrete- variable, continuous-variable, and distributed-phase-reference protocols).
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Entanglement-based quantum communication over 144km
Rupert Ursin,F. Tiefenbacher,F. Tiefenbacher,T. Schmitt-Manderbach,Henning Weier,Thomas Scheidl,Thomas Scheidl,M. Lindenthal,B. Blauensteiner,Thomas Jennewein,Josep Perdigues,Pavel Trojek,B. Omer,M. Furst,M. Meyenburg,John Rarity,Zoran Sodnik,Cesare Barbieri,Harald Weinfurter,Anton Zeilinger +19 more
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