dorsal/arxiv
View SchemaThe Quantum State of a Propagating Laser Field
| Authors | S. J. van Enk, Christopher A. Fuchs |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0111157 |
| URL | https://arxiv.org/abs/quant-ph/0111157 |
| Journal | QIC 2, 151 (2002) |
Abstract
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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"abstract": "Optical implementations of quantum communication protocols typically involve\nlaser fields. However, the standard description of the quantum state of a laser\nfield is surprisingly insufficient to understand the quantum nature of such\nimplementations. In this paper, we give a quantum information-theoretic\ndescription of a propagating continuous-wave laser field and reinterpret\nvarious quantum-optical experiments in light of this. A timely example is found\nin a recent controversy about the quantum teleportation of continuous\nvariables. We show that contrary to the claims of T. Rudolph and B. C. Sanders\n[Phys. Rev. Lett. 87, 077903 (2001)], a conventional laser can be used for\nquantum teleportation with continuous variables and for generating\ncontinuous-variable quantum entanglement. Furthermore, we show that optical\ncoherent states do play a privileged role in the description of propagating\nlaser fields even though they cannot be ascribed such a role for the\nintracavity field.",
"arxiv_id": "quant-ph/0111157",
"authors": [
"S. J. van Enk",
"Christopher A. Fuchs"
],
"categories": [
"quant-ph"
],
"journal_ref": "QIC 2, 151 (2002)",
"title": "The Quantum State of a Propagating Laser Field",
"url": "https://arxiv.org/abs/quant-ph/0111157"
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