Sunday, August 4, 2013

1308.0084 (Melvyn Ho et al.)

Device-independent certification of the teleportation of a qubit    [PDF]

Melvyn Ho, Jean-Daniel Bancal, Valerio Scarani
We want to certify in a black box scenario that two parties simulating the teleportation of a qubit are really using quantum resources. If active compensation is part of the simulation, perfect teleportation can be faked with purely classical means. If active compensation is not implemented, a classical simulation is necessarily imperfect: in this case, we provide bounds for certification of quantumness using only the observed statistics. The usual figure of merit, namely the average fidelity of teleportation, turns out to be too much of a coarse-graining of the available statistical information in the case of a black-box assessment.
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