Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.physleta.2010.12.052
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dc.titleEfficient quantum key distribution with trines of reference-frame-free qubits
dc.contributor.authorTabia, G.
dc.contributor.authorEnglert, B.-G.
dc.date.accessioned2014-10-16T09:22:49Z
dc.date.available2014-10-16T09:22:49Z
dc.date.issued2011-01-24
dc.identifier.citationTabia, G., Englert, B.-G. (2011-01-24). Efficient quantum key distribution with trines of reference-frame-free qubits. Physics Letters, Section A: General, Atomic and Solid State Physics 375 (4) : 817-822. ScholarBank@NUS Repository. https://doi.org/10.1016/j.physleta.2010.12.052
dc.identifier.issn03759601
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96385
dc.description.abstractWe propose a rotationally-invariant quantum key distribution scheme that uses a pair of orthogonal qubit trines, realized as mixed states of three physical qubits. The measurement outcomes do not depend on how Alice and Bob choose their individual reference frames. The efficient key generation by two-way communication produces two independent raw keys, a bit key and a trit key. For a noiseless channel, Alice and Bob get a total of 0.573 key bits per trine state sent (98% of the Shannon limit). This exceeds by a considerable amount the yield of standard trine schemes, which ideally attain half a key bit per trine state. Eavesdropping introduces an ε-fraction of unbiased noise, ensured by twirling if necessary. The security analysis reveals an asymmetry in Eve's conditioned ancillas for Alice and Bob resulting from their inequivalent roles in the key generation. Upon simplifying the analysis by a plausible symmetry assumption, we find that a secret key can be generated if the noise is below the threshold set by ε=0.197. © 2010 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.physleta.2010.12.052
dc.sourceScopus
dc.subjectQuantum key distribution
dc.subjectReference-frame-free qubits
dc.subjectTrine states
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1016/j.physleta.2010.12.052
dc.description.sourcetitlePhysics Letters, Section A: General, Atomic and Solid State Physics
dc.description.volume375
dc.description.issue4
dc.description.page817-822
dc.description.codenPYLAA
dc.identifier.isiut000286683600005
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