We consider quantum fluctuations of the Casimir-Polder force between a neutral atom and a perfectly conducting wall in the ground state of the system. In order to obtain the atom-wall force fluctuation we first define an operator directly associated with the force experienced by the atom considered as a polarizable body in an electromagnetic field and we use a time- averaged force operator in order to avoid ultraviolet divergences appearing in the fluctuation of the force. This time-averaged force operator takes into account that any measurement involves a finite time. We also calculate the Casimir-Polder force fluctuation for an atom between two conducting walls. Experimental observability of these Casimir-Polder force fluctuations is also discussed, as well as the dependence of the relative force fluctuation on the duration of the measurement.

MESSINA R, PASSANTE R (2007). Fluctuations of the Casimir-Polder force between an atom and a conducting wall. PHYSICAL REVIEW A, 76, 032107-1-032107-5 [10.1103/PhysRevA.76.032107].

Fluctuations of the Casimir-Polder force between an atom and a conducting wall

MESSINA, Riccardo;PASSANTE, Roberto
2007

Abstract

We consider quantum fluctuations of the Casimir-Polder force between a neutral atom and a perfectly conducting wall in the ground state of the system. In order to obtain the atom-wall force fluctuation we first define an operator directly associated with the force experienced by the atom considered as a polarizable body in an electromagnetic field and we use a time- averaged force operator in order to avoid ultraviolet divergences appearing in the fluctuation of the force. This time-averaged force operator takes into account that any measurement involves a finite time. We also calculate the Casimir-Polder force fluctuation for an atom between two conducting walls. Experimental observability of these Casimir-Polder force fluctuations is also discussed, as well as the dependence of the relative force fluctuation on the duration of the measurement.
MESSINA R, PASSANTE R (2007). Fluctuations of the Casimir-Polder force between an atom and a conducting wall. PHYSICAL REVIEW A, 76, 032107-1-032107-5 [10.1103/PhysRevA.76.032107].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/19149
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