Quantum Memory for Squeezed Light

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 $1\mu \mathrm{s}$ using electromagnetically induced transparency. The recovered pulse, analyzed using time-domain homodyne tomography, exhibits up to $0.21\pm 0.04\mathrm{dB}$ 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.