- Glauber-Sudarshan P-representation
The

**Glauber-Sudarshan P-representation**is a way of writing down the state of any type oflight using thecoherent state s as a basis. It was developed byGeorge Sudarshan and later adopted byRoy J. Glauber (see the references below). It was the subject of a controversy when Glauber was awarded a share of the 2005Nobel Prize in Physics for his work in this field and Sudarshan's contribution was not recognized.In this representation, the

density matrix is written as::$widehat\{\; ho\}\; =\; int\; varphi(alpha)\; |\{alpha\}\; angle\; langle\; \{alpha\}|\; d^\{2\}alpha,,$

where $scriptstyle|alpha\; angle,$ are the coherent states and $scriptstylevarphi(alpha)\; ,$ is a

quasi-probability distribution .**ee also***

Nonclassical light

*Wigner quasi-probability distribution

*Husimi Q representation **References***E. C. G. Sudarshan, Phys. Rev. Letters 10, 277 (1963)

*Roy J. Glauber, Physical Review 131, 2766 (1963)

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