Experimental entanglement purification of arbitrary unknown states

Nature
Jian-Wei PanAnton Zeilinger

Abstract

Distribution of entangled states between distant locations is essential for quantum communication over large distances. But owing to unavoidable decoherence in the quantum communication channel, the quality of entangled states generally decreases exponentially with the channel length. Entanglement purification--a way to extract a subset of states of high entanglement and high purity from a large set of less entangled states--is thus needed to overcome decoherence. Besides its important application in quantum communication, entanglement purification also plays a crucial role in error correction for quantum computation, because it can significantly increase the quality of logic operations between different qubits. Here we demonstrate entanglement purification for general mixed states of polarization-entangled photons using only linear optics. Typically, one photon pair of fidelity 92% could be obtained from two pairs, each of fidelity 75%. In our experiments, decoherence is overcome to the extent that the technique would achieve tolerable error rates for quantum repeaters in long-distance quantum communication. Our results also imply that the requirement of high-accuracy logic operations in fault-tolerant quantum computation can ...Continue Reading

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Citations

May 14, 2004·Nature·Philip WaltherAnton Zeilinger
Aug 7, 2008·Proceedings of the National Academy of Sciences of the United States of America·Chao-Yang LuJian-Wei Pan
Jul 5, 2005·The Journal of Alternative and Complementary Medicine : Research on Paradigm, Practice, and Policy·Harold Walach
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
Mar 5, 2016·Scientific Reports·Xin-Wen WangC H Oh
Sep 7, 2012·Scientific Reports·Xian-Min JinCheng-Zhi Peng
Sep 10, 2015·Scientific Reports·Zhong-Xiao ManRosario Lo Franco
Dec 25, 2015·Optics Express·Tie-Jun Wang, Chuan Wang
Oct 21, 2015·Optics Express·Jiwon YuneYoon-Ho Kim
Nov 29, 2012·Optics Express·Ana PredojevićGregor Weihs
May 18, 2016·Scientific Reports·Fan-Zhen KongZhuo-Liang Cao
Jun 1, 2016·Nature Communications·Daniela AbdelkhalekRoman Schnabel
Jun 18, 2017·Science·Juan YinJian-Wei Pan
Oct 20, 2006·Nature·R ReichleD J Wineland
Nov 14, 2018·Reports on Progress in Physics·Fulvio FlaminiFabio Sciarrino
Mar 24, 2005·Physical Review Letters·P WaltherA Zeilinger
Aug 22, 2017·Nature·Sheng-Kai LiaoJian-Wei Pan
Apr 12, 2006·Physical Review Letters·Tao YangJie Zhang
Aug 21, 2013·Physical Review Letters·C ZuL-M Duan
Jan 15, 2020·Scientific Reports·Janusz E JacakLucjan Jacak
Feb 22, 2017·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Brian A SlovickJason Valentine
Dec 9, 2017·Physical Review Letters·Ping XuJian-Wei Pan
Mar 10, 2018·Optics Express·Tie-Jun WangChuan Wang
Mar 2, 2019·Physical Review Letters·Michał ParniakWojciech Wasilewski
Apr 16, 2020·Integrative Psychological & Behavioral Science·Majid Beshkar
Mar 17, 2019·Optics Express·Dong-Gil ImYoon-Ho Kim
Jun 13, 2015·Physical Review Letters·Sheng-Jun YangJian-Wei Pan
Dec 1, 2018·Physical Review Letters·Yuanyuan ChenRupert Ursin
Mar 4, 2020·Optics Express·Natapon HarnchaiwatJonathan Leach
Mar 4, 2020·Optics Express·Lan ZhouYu-Bo Sheng
Mar 5, 2016·Physical Review Letters·J C LoredoA G White
May 23, 2006·Physical Review Letters·Edo Waks, Jelena Vuckovic
Mar 16, 2007·Physical Review Letters·Alexei OurjoumtsevPhilippe Grangier
Dec 12, 2012·Physical Review Letters·M MičudaM Ježek
Mar 4, 2014·Physical Review Letters·Yury KurochkinA I Lvovsky
Apr 20, 2004·Physical Review Letters·Nicholas A PetersPaul G Kwiat

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