Disentanglement of Source and Target and the Laser Quantum State

Details Disentanglement of Source and Target and the Laser Quantum State Disentanglement of Source and Target and the Laser Quantum State

2007-12-19

arxiv.org/abs/0712.3271v1

Phys. Rev. Lett. 100, 120405(2008)

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.100.120405

Disentanglement of a laser source from its target qubit is proposed as a criterion establishing the laser quantum state as a coherent state. It is shown that the source-target density operator has a unique factorization in coherent states when the environmental record monitoring laser pump quanta is ignored. The source-target state conditioned upon the complete environmental record is entangled, though, as a state of known total quanta number (source plus target).

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