Disentanglement of Source and Target and the Laser Quantum State

Abstract

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).

4 pages, 1 figure

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Cited by in corpus (6)

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• Artificial coherent states of light by multi-photon interference in a single-photon stream
• Decoherence and the conditions for the classical control of quantum systems
• Estimation of classical parameters via continuous probing of complementary quantum observables
• Is the photon-blockade breakdown a quantum effect? A neoclassical story
• Photon statistics of the light transmitted and reflected by a two-dimensional atomic array