The Quantum State of a Propagating Laser Field

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dc.creatorvan Enk, S. J.
dc.creatorFuchs, Christopher A.
dc.date2001-11-29
dc.date.accessioned2026-07-07T06:03:15Z
dc.date.available2026-07-07T06:03:15Z
dc.descriptionOptical 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.
dc.descriptionThis is a greatly expanded version of quant-ph/0104036, submitted to QIC
dc.identifierhttps://arxiv.org/abs/quant-ph/0111157
dc.identifierhttp://arxiv.org/abs/quant-ph/0111157
dc.identifierQIC 2, 151 (2002)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/89869
dc.subjectQuantum Physics
dc.titleThe Quantum State of a Propagating Laser Field
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