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Coherent control of strongly interacting Rydberg gases in thermal vapor cells

Event Details

Event Dates: 

Monday, August 5, 2013 - 1:30pm

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Prof. Tilman Pfau

Speaker Affiliation(s): 

Universit├Ąt Stuttgart
Seminar Type/Subject

Scientific Seminar Type: 

  • AMO Seminar

Event Details & Abstract: 

Rydberg atoms are of great interest due to their prospects in quantum information processing. Coherent control of the strong Rydberg-Rydberg interaction allows for the realization of quantum operations and devices such as quantum gates and single-photon sources. To date, impressive experimental progress has been limited to the ultracold domain [1]. Being able to exploit this interaction in a coherent manner in thermal vapor would eliminate the need for cooling and trapping of atoms and thus offer new prospects for applications in terms of integration and scalability.We present our progress on the coherent control and investigation of Rydberg atoms in small vapor cells. We show that we are able to drive Rabi oscillations on the nanosecond timescale to a Rydberg state by using a pulsed laser excitation and are therefore faster than the coherence time limitation given by the Doppler width [2].A systematic investigation of the dephasing of these oscillations for different atomic densities and Rydberg S-states (n = 22-40) reveals a clear signature for Rydberg-Rydberg interaction which is the basis for quantum devices based on the Rydberg blockade. Due to the high excitation bandwidth we are probing interaction level shifts up to a few GHz which correspond to very small interatomic distances (