Mean Number and Number Variance of Squeezed Coherent Photons In a Thermal State of Photons

TL;DR

This paper analyzes the properties of squeezed coherent photons in a thermal state, revealing they are at higher temperature and have greater mean number than photons, using an integral spectral function approach.

Contribution

It introduces an integral representation method to determine the spectral function of electromagnetic radiation in thermal equilibrium and nonequilibrium states.

Findings

Squeezed coherent photons are at a higher temperature than photons.

The mean number of squeezed coherent photons exceeds that of photons.

The spectral function approach applies to both equilibrium and nonequilibrium systems.

Abstract

We consider the equilibrium thermal state of photons and determine the mean number and number variance of squeezed coherent photons. We use an integral representation for electro-magnetic radiation applicable both to systems in equilibrium and to systems in nonequilibrium to determine the spectral function of the radiation. The system considered is in thermal equilibrium and we find that the squeezed coherent photons are at a higher temperature than the photons themselves. Also, as expected, the mean number of squeezed coherent photons is greater than that of photons.