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The answer is no, and the details are clearly spelled out in Glauber's Les Houches lectures (circa 1964). Glauber introduces a "T-representation" which can represent any operator in the Fock space of harmonic oscillator states, a less general "R-representation" which can represent any density operator, and the still less general "P-representation" which can ...


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Hanbury Brown and Twiss effect is the correlation between intensities measured simultaneously by independent detectors. It was first used with radio astronomy, and after Twiss provided the mathematics for the quantum optical theory, it was applied to light. Thus there are two ways to make stellar interferometers, the first by means of classical ...


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Note that the paper does not really claim that the Heisenberg-Langevin formalism is more powerful. All it says is that the analysis (emphasis mine), based on the master-equation approach ... precludes consideration of effects associated with atomic dynamics So, it is not the tool which is lacking, but how it has been used. In section V, the author ...



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