Entanglement purification for quantum communication

Nature
J W PanA Zeilinger

Abstract

The distribution of entangled states between distant locations will be essential for the future large-scale realization of quantum communication schemes such as quantum cryptography and quantum teleportation. Because of unavoidable noise in the quantum communication channel, the entanglement between two particles is more and more degraded the further they propagate. Entanglement purification is thus essential to distil highly entangled states from less entangled ones. Existing general purification protocols are based on the quantum controlled-NOT (CNOT) or similar quantum logic operations, which are very difficult to implement experimentally. Present realizations of CNOT gates are much too imperfect to be useful for long-distance quantum communication. Here we present a scheme for the entanglement purification of general mixed entangled states, which achieves 50 per cent of the success probability of schemes based on the CNOT operation, but requires only simple linear optical elements. Because the perfection of such elements is very high, the local operations necessary for purification can be performed with the required precision. Our procedure is within the reach of current technology, and should significantly simplify the imp...Continue Reading

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Citations

May 23, 2003·Nature·Jian-Wei PanAnton Zeilinger
Jan 24, 2009·Science·Ryo OkamotoShigeki Takeuchi
Feb 11, 2016·Scientific Reports·András GilyénIgor Jex
Nov 19, 2015·Proceedings of the National Academy of Sciences of the United States of America·Thomas HerbstAnton Zeilinger
Jul 6, 2016·Scientific Reports·Lan Zhou, Yu-Bo Sheng
May 18, 2016·Scientific Reports·Fan-Zhen KongZhuo-Liang Cao
Aug 27, 2015·Scientific Reports·Yu-Bo Sheng, Lan Zhou
Feb 7, 2013·Scientific Reports·Zong-Wen WeiXiao-Pu Han
Jun 18, 2017·Science·Juan YinJian-Wei Pan
Jul 25, 2017·Nature Communications·Fabian SteinlechnerRupert Ursin
Nov 25, 2003·Nature·J L O'BrienD Branning
Nov 14, 2018·Reports on Progress in Physics·Fulvio FlaminiFabio Sciarrino
Mar 24, 2005·Physical Review Letters·P WaltherA Zeilinger
Mar 17, 2018·Scientific Reports·Yao-Hsin ChouShu-Yu Kuo
Apr 12, 2006·Physical Review Letters·Tao YangJie Zhang
Sep 4, 2008·Physical Review Letters·W J MunroKae Nemoto
Jun 14, 2003·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Caslav Brukner, Anton Zeilinger
Jan 15, 2020·Scientific Reports·Janusz E JacakLucjan Jacak
Mar 1, 2003·Nature·Jian-Wei PanAnton Zeilinger
Dec 9, 2017·Physical Review Letters·Ping XuJian-Wei Pan
Mar 4, 2020·Optics Express·Lan ZhouYu-Bo Sheng
May 23, 2020·Physical Review Letters·Obinna AbahMauro Paternostro
Mar 10, 2018·Optics Express·Tie-Jun WangChuan Wang

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