We study the implementation of a correlation measurement technique for the characterization of squeezed light. We show that the sign of the covariance coefficient revealed from the time-resolved correlation data allow us to distinguish among squeezed, coherent, and thermal states. In contrast to the traditional method of characterizing squeezed light, involving measurement of the variation of the difference photocurrent, the correlation measurement method allows one to eliminate the contribution of the electronic noise, which becomes a crucial issue in experiments with dim sources of squeezed light.
© 2008 Optical Society of America
Original Manuscript: July 9, 2008
Manuscript Accepted: August 17, 2008
Published: October 14, 2008
Leonid A. Krivitsky, Ulrik L. Andersen, Ruifang Dong, Alexander Huck, Christoffer Wittmann, and Gerd Leuchs, "Electronic noise-free measurements of squeezed light," Opt. Lett. 33, 2395-2397 (2008)