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Quantum Electronics and Laser Science Conference

Microwave spectroscopy of Rydberg atom–cavity systems: towards quantum nondemolition measurement of pure photon number states

S. Haroche, F. Bernardot, M. Brune, J. M. Raimond, Nicim Zagury

Published May 12, 1991• 0 citations
OpenAlex

Abstract

The eigen frequencies of a system made of one (or a few Rydberg atom(s) in a high Q, nearly resonant microwave cavity are shifted with respect to both the unperturbed atomic and field mode ones.

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The coupling of atoms to high Q cavities results in strong modifications of the field and atomic frequencies. These effects are most conveniently analyzed in the ‘‘dressed atom’’ point of view. The vacuum Rabi splitting of the atom‐cavity resonance lines is now being observed in optical and microwave experiments where small samples of atoms resonantly interact with an empty cavity mode. Observation of this effect on a single atom coupled to a cavity vacuum is a realistic goal for experiments. Similar shifts are expected when the cavity mode is weakly excited. The detection of these shifts appears very promising for Quantum nondemolition measurements of very small photon numbers. We propose an experiment in which a microwave field stored in a high Q cavity is continuously monitored with the help of a non‐resonant beam of slow circular Rydberg atoms and we discuss possible applications of this method.