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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 10 — May. 12, 2008
  • pp: 7369–7381

Delay of squeezing and entanglement using electromagnetically induced transparency in a vapour cell

G. Hétet, B. C. Buchler, O. Glöckl, M. T. L. Hsu, A. M. Akulshin, H. -A. Bachor, and P. K. Lam  »View Author Affiliations


Optics Express, Vol. 16, Issue 10, pp. 7369-7381 (2008)
http://dx.doi.org/10.1364/OE.16.007369


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Abstract

We demonstrate experimentally the delay of squeezed light and entanglement using Electromagnetically Induced Transparency (EIT) in a rubidium vapour cell. We perform quadrature amplitude measurements of the probe field and find no appreciable excess noise from the EIT process. From input squeezing of 3.2±0.5 dB at low sideband frequencies, we observed the survival of 2.0±0.5 dB of squeezing at the EIT output. By splitting the squeezed light on a beam-splitter, we generated biased entanglement between two beams. We transmit one of the entangled beams through the EIT cell and correlate the quantum statistics of this beam with its entangled counterpart. We experimentally observed a 2.2±0.5µs delay of the biased entanglement and obtained a preserved degree of wavefunction inseparability of 0.71±0.01, below the unity value for separable states.

© 2008 Optical Society of America

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.6570) Quantum optics : Squeezed states

ToC Category:
Quantum Optics

History
Original Manuscript: March 25, 2008
Revised Manuscript: May 5, 2008
Manuscript Accepted: May 5, 2008
Published: May 6, 2008

Citation
G. Hètet, B. C. Buchler, O. Glöeckl, M. T. L. Hsu, A. M. Akulshin, H. A. Bachor, and P. K. Lam, "Delay of squeezing and entanglement using electromagnetically induced transparency in a vapour cell," Opt. Express 16, 7369-7381 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-10-7369


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