HOMODYNE DETECTION FOR MEASURING INTERNAL QUANTUM CORRELATIONS OF OPTICAL PULSES

A method is described for determining the quantum correlations at diff erent times in optical pulses by using balanced homodyne detection. Th e signal pulse and sequences of ultrashort test pulses (local oscillat ors) are superimposed, where for chosen distances between the test pul ses their relative phases and intensities are varied from measurement to measurement. The correlation statistics of the signal pulse is obta ined from the time-integrated difference photocurrents measured.