There is no unmet requirement of optical coherence for continuous-variable quantum teleportation

Details There is no unmet requirement of optical coherence for continuous-variable quantum teleportation There is no unmet requirement of optical coherence for continuous-variable quantum teleportation

2002-09-30

arxiv.org/abs/quant-ph/0209163v1

Journal of Modern Optics 50, 1797-1800 (2003).

Physics

Quantum Physics

6 pages, no figures, no equations, to be published in Journal of Modern Optics. This is a long version of quant-ph/0104004. I

Scientific paper

It has been argued [T. Rudolph and B.C. Sanders, Phys. Rev. Lett. 87, 077903 (2001)] that continuous-variable quantum teleportation at optical frequencies has not been achieved because the source used (a laser) was not `truly coherent'. Here I show that `true coherence' is always illusory, as the concept of absolute time on a scale beyond direct human experience is meaningless. A laser is as good a clock as any other, even in principle, and this objection to teleportation experiments is baseless.

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