2006/05/31 by Antonio Acín, Antonio Acin, Serge Massar +1 · 2 citations
Computer Science · Physics and Astronomy · #Advanced Statistical Modeling Techniques #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1088/1367-2630/8/8/126
published as New J. Phys. 8, 126 (2006) · 11 pages, 2 color figures. v2: minor modifications, added references, added note on the relation to quant-ph/0606049
openalex publication_date 2006/08/02 · arxiv created 2006/08/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
By carrying out measurements on entangled states, two parties can generate a secret key which is secure not only against an eavesdropper bound by the laws of quantum mechanics, but also against a hypothetical 'post-quantum' eavesdroppers limited by the no-signalling principle only. We introduce a family of quantum key distribution protocols of this type, which are more efficient than previous ones, both in terms of key rate and noise resistance. Interestingly, the best protocols involve large number of measurements. We show that in the absence of noise, these protocols can yield one secret bit per entanglement bit, implying that the key rates in the no-signalling post-quantum scenario are comparable to the key rates in usual quantum key distribution.