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Quantum State of an Ideal Propagating Laser Field

2001; American Physical Society; Volume: 88; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.88.027902

1092-0145

S. J. van Enk, Christopher A. Fuchs,

Quantum optics and atomic interactions

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.