Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 60: Materiewellen und Technologie

Q 60.1: Talk

Friday, March 16, 2012, 10:30–10:45, V53.01

Multi-spatial-mode amplitude squeezing on a single beam. — •Matthew Turnbull, Plamen Petrov, Vincent Boyer, and Kai Bongs — University of Birmingham, Birmingham UK.

A method is presented here to generate a beam of light with amplitude fluctuations below the standard quantum limit across multiple spatial modes.

Four-wave-mixing in hot Rubidium vapour has previously been shown to generate twin-beams that demonstrate quantum correlations in spatially correlated regions, that is to say entanglement between multiple spatial modes. This next step combines these beams with the result being a single beam with reduced amplitude fluctuations across an equal number of modes.

The key to the process is the level of gain achievable on a single pass through the Rb cell which negates the need for a cavity, typically required in a squeezing setup, hence also removing the cavity-mode-limited nature of the squeezing.

Included in this talk will be a description of the theory underlying this process along with the current status of the experiment being performed and a selection of possible uses for such a beam, e.g. storing quantum information with greater coherence or ultra-low-noise quantum imaging.