Giant violations of classical inequalities by the quantum fluctuations of squeezed light

Summary form only given. The squeezing of an optical field is normally observed in the frequency domain using balanced homodyne detection to measure the fluctuation variance of a selected quadrature amplitude. The scheme amounts to a measurement of sub-Poissonian photon statistics and is sensitive to efficiencies as any such unconditional measurement is. Conditional measurements are independent of efficiencies. We propose a conditional homodyne detection scheme for observing the amplitude fluctuations of squeezed light. The central idea is to sample the photocurrent by triggering on a photon count and hence realize an efficiency independent measurement that resolves the quantum fluctuations in time. Our scheme directly measures the correlation function.