Time-reversal formalism applied to maximal bipartite entanglement: Theoretical and experimental exploration

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M. Laforest, J. Baugh, and R. Laflamme
Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

Received 10 October 2005; published 17 March 2006

Withinthe context of quantum teleportation, a proposed interpretation of bipartiteentanglement describes teleportation as consisting of a qubit of informationevolving along and against the flow of time of anexternal observer. We investigate the physicality of such a modelby applying time reversal to the Schrödinger equation in theteleportation context. To do so, we first present the theoryof time reversal applied to the circuit model. We thenshow that the outcome of a teleportationlike circuit is consistentwith the usual tensor product treatment and is therefore independentof the physical quantum system used to encode the information.Finally, we illustrate these concepts with a proof-of-principle experiment ona liquid-state NMR quantum-information processor. The experimental results are consistentwith the interpretation that information can be seen as flowingbackward in time through entanglement.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.032323
DOI:	10.1103/PhysRevA.73.032323
PACS:	03.67.Mn 03.67.Mn Quantum entanglement production, characterization, and manipulation YEAR: 2006
KEYWORDS:	teleportation, quantum entanglement, quantum computing, Schrodinger equation, encoding, nuclear magnetic resonance

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