Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method

A probe light in a squeezed vacuum state was injected into cold Rb-87 atoms with an intense control light in a coherent state. A sub-MHz window was created due to electromagnetically induced transparency, and the incident squeezed vacuum could pass through the cold atoms without optical loss, as was successfully monitored using a time-domain homodyne method. (C) 2007 Optical Society of America.