Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.74.052305
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dc.titleTeleportation with a mixed state of four qubits and the generalized singlet fraction
dc.contributor.authorYeo, Y.
dc.date.accessioned2014-10-16T09:44:23Z
dc.date.available2014-10-16T09:44:23Z
dc.date.issued2006
dc.identifier.citationYeo, Y. (2006). Teleportation with a mixed state of four qubits and the generalized singlet fraction. Physical Review A - Atomic, Molecular, and Optical Physics 74 (5) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.74.052305
dc.identifier.issn10502947
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/98217
dc.description.abstractRecently, an explicit protocol E0 for faithfully teleporting arbitrary two-qubit states using genuine four-qubit entangled states was presented by us. Here, we show that E0 with an arbitrary four-qubit mixed-state resource Ξ is equivalent to a generalized depolarizing bichannel with probabilities given by the maximally entangled components of the resource. These are defined in terms of our four-qubit entangled states. We define the generalized singlet fraction G [Ξ] and illustrate its physical significance with several examples. We argue that in order to teleport arbitrary two-qubit states with average fidelity better than is classically possible, we have to demand that G [Ξ] > 2. In addition, we conjecture that when G [Ξ] < 4, then no entanglement could be teleported. It is shown that to determine the usefulness of Ξ for E0, it is necessary to analyze G [Ξ]. © 2006 The American Physical Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1103/PhysRevA.74.052305
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1103/PhysRevA.74.052305
dc.description.sourcetitlePhysical Review A - Atomic, Molecular, and Optical Physics
dc.description.volume74
dc.description.issue5
dc.description.page-
dc.description.codenPLRAA
dc.identifier.isiut000242408900036
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