The Quantum State of a Propagating Laser Field

Details The Quantum State of a Propagating Laser Field The Quantum State of a Propagating Laser Field

2001-11-29

arxiv.org/abs/quant-ph/0111157v1

QIC 2, 151 (2002)

Physics

Quantum Physics

This is a greatly expanded version of quant-ph/0104036, submitted to QIC

Scientific paper

Optical implementations of quantum communication protocols typically involve laser fields. However, the standard description of the quantum state of a laser field is surprisingly insufficient to understand the quantum nature of such implementations. In this paper, we give a quantum information-theoretic description of a propagating continuous-wave laser field and reinterpret various quantum-optical experiments in light of this. A timely example is found in a recent controversy about the quantum teleportation of continuous variables. We show that contrary to the claims of 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 quantum entanglement. Furthermore, we show that optical coherent states do play a privileged role in the description of propagating laser fields even though they cannot be ascribed such a role for the intracavity field.

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