Geodesic
Estimate of the entropy of radiation by means of weight functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 1, pp. 126-129

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The entropy of radiation is estimated by means of weight functions that characterize the representation of the density operator in coherent states. An upper bound is always valid and a lower bound when there is a positive $\mathscr P$-representation. A necessary condition is formulated that must be satisfied by the diagonal elements of the density operator in the population number space if the operator is to have a positive $\mathscr P$-representation. 
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     author = {V. Ya. Anisimov and B. A. Sotskii},
     title = {Estimate of the entropy of radiation by means of weight functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1976},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1976_29_1_a12/}
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V. Ya. Anisimov; B. A. Sotskii. Estimate of the entropy of radiation by means of weight functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 1, pp. 126-129. http://geodesic.mathdoc.fr/item/TMF_1976_29_1_a12/