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The following QIPIRC Coffee Talk seminar will be transmitted as an experimental Quicktime live streaming webcast at 11am (BST) on Thursday 6 October 2005.

To view this broadcast, please use the Quicktime Player (available for Windows and Mac) or mplayer or xine under Linux. The Quicktime Player is available from:

http://www.apple.com/quicktime/download/standalone.html

Open the URL

rtsp://oums-fermat.materials.ox.ac.uk/qipirc.sdp

in the Player, and you will be asked for a username and password. As of the start of the webcast (11am), these will be

user: qipirc

password: entanglement

This first webcast is highly experimental; some users have discovered that their department or institution's firewall prevents connection to the stream. We hope to provide a more accessible stream in the future that will not require special firewall traversal rules.

Feedback on the transmission is welcome, please let us know your experience by emailing mark.jones@materials.ox.ac.uk

The title and abstract are below:

Quantum state entanglement and readout of collective atomic-ensemble modes and optical wave-packets by stimulated Raman scattering

Professor M. G. Raymer, Department of Physics and Oregon Center for Optics University of Oregon Eugene, Oregon

Experiments are underway for the creation of macroscopic quantum states of collective atomic ensemble variables by the use of stimulated Raman scattering (SRS) in atomic rubidium, followed by conditional optical measurement. After the completion of the SRS process, one is able to reverse the process and return all the atoms to their ground states in such a way that reads out an arbitrary quantum state of the collective atomic field and writes this state onto the outgoing optical field.

This scheme can be used for the creation of entanglement between two distant atomic ensembles.

Remarkably, it is found that this multimode problem can be simplified theoretically to a two-mode problem involving spatial-temporal wave-packet modes of the optical and atomic collective fields [J. Modern Optics, 51, 1739 (2004)]. This improves the understanding of the entanglement created in this system.