Phase Probability Density Function in Two-Mode Fock Space

Based on the newly found representation |η > = exp-(|η|²/2) +η a + η*b - a b |00> in which the phase operator √(a+b )l(a+b) corresponding to Shapiro-Wagner phase measurement scheme manifestly exhibits its phase behavior, we construct the phase probability density function in the two-mode Fock space, which provides an alternative approach for analysing the phase properties of optical fields.