title: Quantum state of an ideal propagating laser field.
abstract: We give a quantum information-theoretic description of an ideal propagating cw laser field and reinterpret typical quantum-optical experiments in light of this. In particular, we show that, contrary to recent claims [T. Rudolph and B. C. Sanders, Phys. Rev. Lett. 87, 077903 (2001)], a conventional laser can be used for quantum teleportation with continuous variables and for generating continuous-variable entanglement. Optical coherence is not required, but phase coherence is. We also show that coherent states play a privileged role in the description of laser light.
authors.affiliation: Bell Labs, Lucent Technologies, 600-700 Mountain Avenue, Murray Hill, New Jersey 07974, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: van Enk
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Fuchs