15.20.–e Quantum Optics: Experimental system

Feedback Cooling of a Single Neutral Atom


M. Koch, C. Sames, A. Kubanek, M. Apel, M. Balbach, a. ourjoumtsev, Pepijn W.H. Pinkse and G. Rempe
Phys. Rev. Letter (2010), in press

We demonstrate feedback cooling of the motion of a single rubidium atom trapped in a high-finesse optical resonator to a temperature of about 160 \mu K. Time-dependent transmission and intensity-correlation measurements prove the reduction of the atomic position uncertainty. The feedback increases the 1/e storage time into the one second regime, 30 times longer than without feedback. Feedback cooling therefore rivals state-of-the-art laser cooling, but with the advantages that it requires less optical access and exhibits less optical pumping.

Electromagnetically induced transparency with single atoms in a cavity


Martin Mücke, Eden Figueroa, Joerg Bochmann, Carolin Hahn, Karim Murr, Stephan Ritter, Celso J. Villas-Boas, Gerhard Rempe


Nature 465, 755 (2010)

Optical nonlinearities offer unique possibilities for the control of light with light. A prominent example is electromagnetically induced transparency (EIT) where the transmission of a probe beam through an optically dense medium is manipulated by means of a control beam. Scaling such experiments into the quantum domain with one, or just a few particles of both light and matter will allow for the implementation of quantum computing protocols with atoms and photons or the realisation of strongly interacting photon gases exhibiting quantum phase transitions of light.

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