Squeezing and Entangling a laser pointer
ACQAO paper wins EOS prize

Posted: 5 September 2007

The position and direction of a laser beam contains information as much as its intensity or phase.  A laser carries all of this information, since it has multiple spatial modes.  Each mode separately conforms to the uncertainty principle and the challenge is to generate squeezing entanglement.

Our achievement on squeezing has been rewarded with the EOS prize for 2007.  The publication “Generation of squeezing in higher order Hermite-Gaussian modes with an optical parametric amplifier” EOS Rapid Publ. Vol 1, 06003 (2006) by M. Lassen, V. Delaubert, C.C. Harb, P.K. Lam, N. Treps and H. A. Bachor was selected as the best publication in an EOS journal in 2006.

View the newsletter and other celebrations of this prize.

This is an international collaboration between DTU Copenhagen, ACQAO-ANU
Canberra, Pierre Marie Curie Paris with all the experiments carried out at ANU.

Rapid progress has been made recently. We are now able to generate pairs of laser beams which are entangled in their position and direction.  This is work in progress and we have already seen entanglement of the spatial modes with a separability of better than 0.5, which represents a strong quantum correlation.  This works all the tools which we developed in recent years at ACQAO to manipulate spatial multimodes.

Further information can be found in our recent publication on spatial multimode quantum information at:

http://link.aps.org/abstract/PRL/v98/e083602

Winners of the EOS prize 2007.