Quantum Memory for Squeezed Light
Abstract
We produce a 600-ns pulse of 1.86-dB squeezed vacuum at 795 nm in an optical parametric amplifier and store it in a rubidium vapor cell for 1μs using electromagnetically induced transparency. The recovered pulse, analyzed using time-domain homodyne tomography, exhibits up to 0.21±0.04dB of squeezing. We identify the factors leading to the degradation of squeezing and investigate the phase evolution of the atomic coherence during the storage interval.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2008
- DOI:
- 10.1103/PhysRevLett.100.093602
- arXiv:
- arXiv:0709.2258
- Bibcode:
- 2008PhRvL.100i3602A
- Keywords:
-
- 42.50.Gy;
- 03.67.-a;
- 42.50.Dv;
- Effects of atomic coherence on propagation absorption and amplification of light;
- electromagnetically induced transparency and absorption;
- Quantum information;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Quantum Physics
- E-Print:
- To appear in PRL. Changes to version 3: we present a larger data set featuring somewhat less squeezing, but also better statistics and a lower margin of error. Some additional revisions are made in response to the referees' comments