Quantum memory for squeezed light

Abstract

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.

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

References in corpus (7)

• Experimental demonstration of quantum memory for light
• A computable measure of nonclassicality for light
• Diluted maximum-likelihood algorithm for quantum tomography
• Quantum study of information delay in electromagetically induced transparency
• Ultraslow Propagation of Squeezed Vacuum Pulses with Electromagnetically Induced Transparency
• Observation of Electromagnetically Induced Transparency for a Squeezed Vacuum with the Time Domain Method
• Frequency filtered storage of parametric fluorescence with electromagnetically induced transparency

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• Phase-sensitive Manipulations of Squeezed Vacuum Field in an Optical Parametric Amplifier inside an Optical Cavity
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• Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint
• Vacuum squeezed light for atomic memories at the D2 cesium line
• Realization of Coherent Optically Dense Media via Buffer-Gas Cooling
• Delay of Squeezing and Entanglement using Electromagnetically Induced Transparency in a Vapour Cell
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• Atomic-ensemble-based quantum memory for sideband modulations