74 research outputs found
All-atomic source of squeezed vacuum with full pulse-shape control
We report on the generation of pulses of a low-frequency squeezed vacuum with
noise suppression >2 dB below the standard quantum limit in a hot resonant 87
Rb vapor with polarization self-rotation. We demonstrate the possibility to
precisely control the temporal profile of the squeezed noise quadrature by
applying a calibrated longitudinal magnetic field, without degrading the
maximum amount of squeezing
Group velocity study in hot Rb vapor with buffer gas
We study the behavior of the group velocity of light under conditions of
electromagnetically induced transparency (EIT) in a Doppler broadened medium.
Specifically, we show how the group delay (or group velocity) of probe and
generated Stokes fields depends on the one-photon detuning of drive and probe
fields. We find that for atoms in a buffer gas the group velocity decreases
with positive one-photon detuning of the drive fields, and increases when the
fields are red detuned. This dependence is counter-intuitive to what would be
expected if the one-photon detuning resulted in an interaction of the light
with the resonant velocity subgroup.Comment: 6 pages, 7 figure
- …