Quantum damping of position due to energy measurements

Details Quantum damping of position due to energy measurements Quantum damping of position due to energy measurements

1996-06-24

arxiv.org/abs/quant-ph/9606024v1

Physics

Quantum Physics

19 pages + 4 figures available upon request; Plain REVTeX; To be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.53.3773

Quantum theory for measurements of energy is introduced and its consequences for the average position of monitored dynamical systems are analyzed. It turns out that energy measurements lead to a localization of the expectation values of other observables. This is manifested, in the case of position, as a damping of the motion without classical analogue. Quantum damping of position for an atom bouncing on a reflecting surface in presence of a homogeneous gravitational field is dealt in detail and the connection with an experiment already performed in the classical regime is studied. We show that quantum damping is testable provided that the same measurement strength obtained in the experimental verification of the quantum Zeno effect in atomic spectroscopy [W. M. Itano et al., Phys. Rev. A {\bf 41}, 2295 (1990)] is made available.

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