Download e-book for kindle: A Quantum Theory of Optical Dispersion by Darwin C. G.

By Darwin C. G.

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As the atoms are the source of the field, the field statistics can be related to the atomic statistics in a systematic manner [35]. The observation of sub-Poissonian atomic statistics was reported by Rempe, Schmidt-Kaler and Walther [36], and its relation to the sub-Poissonian photon distribution was first studied by Rempe and Walther [37] and later by Briegel et al. [35]. The reason for the sub-Poissonian atomic statistics is as follows: A changing flux of atoms changes the Rabi frequency via the stored photon number in the cavity.

This means that when, for example, two atoms in the upper state enter the cavity close to each other, the second one performs a transition to the lower state with reduced probability. The interaction with the cavity field thus leads to an atomic beam with atoms in the lower maser level showing number fluctuations which are up to 40 % below those of a Poissonian distribution usually found in atomic beams. This is interesting because atoms in the lower level have emitted a photon to compensate for cavity losses inevitably present.

The oscillation undergoes collapse due to the dispersion of the Rabi frequencies. This effect is unitary and reversible.

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