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International Conference on Quantum Information

Electromagnetically-Induced Transparency and Squeezed Light

Eden V. Figueroa, J. Appel, Dmitry Korystov, Mirko Lobino, Alexander I. Lvovsky

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We investigate propagation and storage of pulses of squeezed vacuum in rubidium vapor under the conditions of electromagnetically-induced transparency. Quantum states of retrieved pulses are characterized by optical homodyne tomography.
DOI
10.1364/icqi.2008.qwd2

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AIP conference proceedings•Jan 1, 2009•0 citations
Abstract. We analyze the transmission of continuous-wave and pulsed squeezed vacuum through rubidium vapor under the conditions of electromagnetically induced transparency. Our analysis is based on a full theoretical treatment for a squeezed state of light propagating through temporal and spectral filters and detected using timeand frequency-domain homodyne tomography. A model based on a three-level atom allows us to evaluate the linear losses and extra noise that degrade the nonclassical properties of the squeezed vacuum during the atomic interaction and eventually predict the quantum states of the transmitted light with a high precision.
We analyze the transmission of continuous-wave and pulsed squeezed vacuum through rubidium vapor under the conditions of electromagnetically induced transparency. Our analysis is based on a full theoretical treatment for a squeezed state of light propagating through temporal and spectral filters and detected using time and frequency-domain homodyne tomography. A model based on a three-level atom allows us to evaluate the linear losses and extra noise that degrade the nonclassical properties of the squeezed vacuum during the atomic interaction and eventually predict the quantum states of the transmitted light with a high precision.
Storage and retrieval of a squeezed vacuum was successfully demonstrated using electromagnetically induced transparency. The squeezed vacuum pulse having a temporal width of 930 ns was incident on the laser cooled 87Rb atoms with an intense control light in a coherent state. When the squeezed vacuum pulse was slowed and spatially compressed in the cold atoms, the control light was switched off. After 3 mus of storage, the control light was switched on again, and the squeezed vacuum was retrieved, as was confirmed using the time-domain homodyne method.
Storage and retrieval of a squeezed vacuum was successfully demonstrated using electromagnetically induced transparency. The squeezed vacuum pulse having a temporal width of 930 ns was incident on the laser cooled 87Rb atoms with an intense control light in a coherent state. When the squeezed vacuum pulse was slowed and spatially compressed in the cold atoms, the control light was switched off. After 3 µs of storage, the control light was switched on again, and the squeezed vacuum was retrieved, as was confirmed using the time-domain homodyne method.
We report theoretical and experimental studies of the transmission and storage of squeezed vacuum under the conditions of electromagnetically induced transparency in rubidium vapor. A model based on a three‐level atom allows us to evaluate the linear losses and extra noise that degrade nonclassical properties of the squeezed vacuum during the atomic interaction and eventually predict the quantum states of the transmitted light with a high precision. Experimentally, we show that squeezing is preserved after storage in rubidium vapor for 1 μs.