  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.
