Measuring photon antibunching from continuous variable sideband squeezing

We present a technique for measuring the second-order coherence function g(2)(τ) of light using a Hanbury Brown-Twiss intensity interferometer modified for homodyne detection. The experiment was performed entirely in the continuous-variable regime at the sideband frequency of a bright carrier field. We used the setup to characterize g(2)(τ) for thermal and coherent states and investigated its immunity to optical loss. We measured g(2)(τ) of a displaced-squeezed state and found a best antibunching statistic of g(2)(0)=0.11±0.18.