Based on the newly found representation|η>=exp[-(|η|^(2)/2)+ηa^(■)+η^(*)b^(■)-a^(■)b^(■)]|00>in which the phase operator√(a+b^(■))/(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.
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