We produce a 600-ns pulse of 1.86-dB squeezed vacuum at 795 nm in an optical parametric amplifier and store it in a rubidium vapor cell for 1 us using electromagnetically induced transparency. The recovered pulse, analyzed using time-domain homodyne tomography, exhibits up to 0.21+-0.04 dB of squeezing. We identify the factors leading to the degradation of squeezing and investigate the phase evolution of the atomic coherence during the storage interval.
@article{arxiv.0709.2258,
title = {Quantum memory for squeezed light},
author = {Juergen Appel and Eden Figueroa and Dmitry Korystov and M. Lobino and A. I. Lvovsky},
journal= {arXiv preprint arXiv:0709.2258},
year = {2009}
}
Comments
To appear in PRL. Changes to version 3: we present a larger data set featuring somewhat less squeezing, but also better statistics and a lower margin of error. Some additional revisions are made in response to the referees' comments