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https://doi.org/10.1103/PhysRevA.74.052305
Title: | Teleportation with a mixed state of four qubits and the generalized singlet fraction | Authors: | Yeo, Y. | Issue Date: | 2006 | Citation: | Yeo, 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 | Abstract: | Recently, 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. | Source Title: | Physical Review A - Atomic, Molecular, and Optical Physics | URI: | http://scholarbank.nus.edu.sg/handle/10635/98217 | ISSN: | 10502947 | DOI: | 10.1103/PhysRevA.74.052305 |
Appears in Collections: | Staff Publications |
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