Bichromatic homodyne detection of broadband quadrature squeezing

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes


We experimentally study a homodyne detection technique for the characterization of a quadrature squeezed field where the correlated bands, here created by four-wave mixing in a hot atomic vapor, are separated by a large frequency gap of more than 6 GHz. The technique uses a two-frequency local oscillator to detect the fluctuations of the correlated bands at a frequency accessible to the detection electronics. Working at low detection frequency, the method allows for the determination of both the amplitude and the phase of the squeezing spectrum. In particular, we show that the quadrature squeezing created by our four-wave mixing process displays a noise ellipse rotation of $\pi/2$ across the squeezing spectrum

Bibliographic note

11 pages, 5 figures


Original languageEnglish
Pages (from-to)27298-27308
Number of pages11
JournalOptics Express
Issue number24
Publication statusPublished - 15 Nov 2016