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dc.contributor.authorRalph, T
dc.contributor.authorWalk, Nathan
dc.date.accessioned2017-05-25T01:20:51Z
dc.date.available2017-05-25T01:20:51Z
dc.date.issued2015
dc.identifier.issn1367-2630
dc.identifier.doi10.1088/1367-2630/17/6/063008
dc.identifier.urihttp://hdl.handle.net/10072/101718
dc.description.abstractQuantum Key Distribution is a quantum communication technique in which random numbers are encoded on quantum systems, usually photons, and sent from one party, Alice, to another, Bob. Using the data sent via the quantum signals, supplemented by classical communication, it is possible for Alice and Bob to share an unconditionally secure secret key. This is not possible if only classical signals are sent. While this last statement is a long standing result from quantum information theory it turns out only to be true in a non-relativistic setting. If relativistic quantum field theory is considered we show it is possible to distribute an unconditionally secure secret key without sending a quantum signal, instead harnessing the intrinsic entanglement between different regions of space–time. The protocol is practical in free space given horizon technology and might be testable in principle in the near term using microwave technology.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherInstitute of Physics Publishing
dc.relation.ispartofpagefrom63008-1
dc.relation.ispartofpageto63008-13
dc.relation.ispartofissue6
dc.relation.ispartofjournalNew Journal of Physics
dc.relation.ispartofvolume17
dc.subject.fieldofresearchPhysical Sciences not elsewhere classified
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchcode029999
dc.subject.fieldofresearchcode02
dc.titleQuantum key distribution without sending a quantum signal
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by/3.0/
dc.description.versionPublished
gro.rights.copyright© The Author(s) 2015. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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gro.griffith.authorWalk, Nathan


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