PMID: 15245320Jul 13, 2004Paper

Entanglement as a precondition for secure quantum key distribution

Physical Review Letters
Marcos CurtyN Lutkenhaus

Abstract

We demonstrate that a necessary precondition for an unconditionally secure quantum key distribution is that both sender and receiver can use the available measurement results to prove the presence of entanglement in a quantum state that is effectively distributed between them. One can thus systematically search for entanglement using the class of entanglement witness operators that can be constructed from the observed data. We apply such analysis to two well-known quantum key distribution protocols, namely, the 4-state protocol and the 6-state protocol. As a special case, we show that, for some asymmetric error patterns, the presence of entanglement can be proven even for error rates above 25% (4-state protocol) and 33% (6-state protocol).

References

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Citations

Apr 30, 2014·Nature Communications·Marcos CurtyHoi-Kwong Lo
Jul 5, 2017·Reports on Progress in Physics·Joonwoo Bae
Feb 9, 2005·Physical Review Letters·Antonio Acín, Nicolas Gisin
Feb 18, 2018·Scientific Reports·Gui-Jun ZhangShao-Ming Fei
Apr 15, 2010·Optics Express·Christoffer WittmannGerd Leuchs
Jun 4, 2008·Physical Review Letters·Lijian ZhangIan A Walmsley
Jan 21, 2011·Nature·Stephanie SimmonsJohn J L Morton
Sep 28, 2010·Physical Review Letters·Remigiusz AugusiakAntonio Acín
Jan 30, 2016·Physical Review Letters·Stephan WaeldchenJens Eisert
Mar 16, 2019·Optics Letters·Chun-Hui ZhangQin Wang
Apr 24, 2019·Physical Review Letters·Roope UolaOtfried Gühne
Jan 25, 2020·Physical Review Letters·Yingqiu MaoJian-Wei Pan
Mar 22, 2007·Optics Letters·Chil-Min KimYoung-Jai Park
Aug 9, 2020·Scientific Reports·Shihan SajeedVadim Makarov
Dec 31, 2016·Physical Review Letters·Shihan SajeedMarcos Curty
May 23, 2020·Physical Review Letters·Obinna AbahMauro Paternostro
Dec 18, 2004·Physical Review Letters·D BrussU Sen
Jan 16, 2021·Physical Review Letters·Javier González-PayoMarcos Curty
Jan 8, 2021·Physical Review Letters·A J PaigeM S Kim
Aug 8, 2009·Physical Review Letters·M PianiP Horodecki
Aug 11, 2005·Physical Review Letters·N J CerfS Popescu
Apr 29, 2014·Physical Review Letters·Ping XuJian-Wei Pan
Aug 11, 2005·Physical Review Letters·Hoi-Kwong LoKai Chen
Aug 11, 2005·Physical Review Letters·Won-Ho KyeYoung-Jai Park
Nov 24, 2011·Physical Review Letters·Hyang-Tag LimYoon-Ho Kim
Sep 26, 2012·Physical Review Letters·Ryo Namiki, Yuuki Tokunaga
Apr 24, 2021·Physical Review Letters·Otfried GühneXiao-Dong Yu

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