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dc.contributor.authorHou, Zhibo
dc.contributor.authorZhong, Han-Sen
dc.contributor.authorTian, Ye
dc.contributor.authorDong, Daoyi
dc.contributor.authorQi, Bo
dc.contributor.authorLi, Li
dc.contributor.authorWang, Yuanlong
dc.contributor.authorNori, Franco
dc.contributor.authorXiang, Guo-Yong
dc.contributor.authorLi, Chuan-Feng
dc.contributor.authorGuo, Guang-Can
dc.date.accessioned2018-01-18T23:53:33Z
dc.date.available2018-01-18T23:53:33Z
dc.date.issued2016
dc.identifier.issn1367-2630
dc.identifier.doi10.1088/1367-2630/18/8/083036
dc.identifier.urihttp://hdl.handle.net/10072/100311
dc.description.abstractFull quantum state tomography (FQST) plays a unique role in the estimation of the state of a quantum system without a priori knowledge or assumptions. Unfortunately, since FQST requires informationally (over)complete measurements, both the number of measurement bases and the computational complexity of data processing suffer an exponential growth with the size of the quantum system. A 14-qubit entangled state has already been experimentally prepared in an ion trap, and the data processing capability for FQST of a 14-qubit state seems to be far away from practical applications. In this paper, the computational capability of FQST is pushed forward to reconstruct a 14-qubit state with a run time of only 3.35 hours using the linear regression estimation (LRE) algorithm, even when informationally overcomplete Pauli measurements are employed. The computational complexity of the LRE algorithm is first reduced from∼1019 to∼1015 for a 14-qubit state, by dropping all the zero elements, and its computational efficiency is further sped up by fully exploiting the parallelism of the LRE algorithm with parallel Graphic Processing Unit (GPU) programming. Our result demonstrates the effectiveness of using parallel computation to speed up the postprocessing for FQST, and can play an important role in quantum information technologies with large quantum systems.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherInstitute of Physics Publishing
dc.relation.ispartofpagefrom083036-1
dc.relation.ispartofpageto083036-8
dc.relation.ispartofjournalNew Journal of Physics
dc.relation.ispartofvolume18
dc.subject.fieldofresearchPhysical Sciences not elsewhere classified
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchcode029999
dc.subject.fieldofresearchcode02
dc.titleFull reconstruction of a 14-qubit state within four hours
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttps://creativecommons.org/licenses/by/3.0/
dc.description.versionVersion of Record (VoR)
gro.rights.copyright©2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an Open Access article distributed under the terms of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) License (https://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorLi, Kenny
gro.griffith.authorWang, Yuanlong


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