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

Abstract

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.

6 pages, no figures, no equations, to be published in Journal of Modern Optics. This is a long version of quant-ph/0104004. I have not replaced that paper with this one because some authors have referenced that one approvingly who may feel differently about doing so to this version

References in corpus (2)

• The Quantum State of an Ideal Propagating Laser Field
• Requirement of optical coherence for continuous-variable quantum teleportation

Cited by in corpus (5)

• Nonclassical Light and Metrological Power: An Introductory Review
• Decoherence-full subsystems and the cryptographic power of a private shared reference frame
• Photon-number superselection and the entangled coherent-state representation
• Entanglement under restricted operations: Analogy to mixed-state entanglement
• Quantum nature of laser light