Quantum mechanical photoncount formula derived by entangled state representation
胡利云, 王资生, Hong-Yi Fan · Chinese Physics B · 2011
By introducing the thermo entangled state representation, we derive four new photocount distribution formulas for a given light field density operator. It is shown that these new formulas, which are convenient to calculate the photocount, can be expressed as integrations over a Laguerre—Gaussian function with a characteristic function, Wigner function, Q -function and P -function, respectively.