Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quanteneffekte (Interferenz und Korrelationen)

Q 16.9: Vortrag

Montag, 19. März 2007, 18:30–18:45, 5E

Non-destructive measurements on the Cs clock transition: towards atomic spin squeezing — •Patrick Windpassinger, Daniel Oblak, Niels Kjaergaard, and Eugene Polzik — Niels Bohr Institute, Blegdamsvej 17, Copenhagen, Denmark

We use a nondestructive interferometric measurement of the clock states populations of an ensemble of laser-cooled and trapped Cs atoms to study the state evolution when the sample is subjected to light and microwave pulses.

The nondestructive character of the measurement allows us to follow online the quantum state of the system while it is being engineered. Here we show measurements of Rabi-oscillations on the clock transition which allow us to produce states on a generalized Bloch sphere. Ultimately, the dispersive character of the measurement leads to squeezing of the population number difference of the clock states and the sensitivity of the setup should allow us to observe squeezing as sub-projection noise.