Ultraslow Propagation of Squeezed Vacuum Pulses with Electromagnetically Induced Transparency

Abstract

We have succeeded in observing ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency. Squeezed vacuum pulses (probe lights) were incident on a laser cooled 87Rb gas together with an intense coherent light (control light). A homodyne method sensitive to the vacuum state was employed for detecting the probe pulse passing through the gas. A delay of 3.1us was observed for the probe pulse having a temporal width of 10 us.

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• Quantum memory of a squeezed vacuum for arbitrary frequency sidebands
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• Non-separated states from squeezed dark-state polaritons in electromagnetically-induced-transparency media
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