Abstract
The potential. The cooling beams are then turned on in zero magnetic field to form an optical molasses, and the resonance fluorescence is recorded on a charge-coupled-device camera. Using this system, non-exponential decay for short times has been observed [4]. In this work, we focus on the effect of repeated measurements on the decay behavior of the system during the non-exponential time. For measurements at very short time intervals we observe a substantial suppression of the decay rate as compared to the unperturbed system, the Quantum Zeno effect. For a longer time delay between measurements we observe an enhancement of the decay, the Anti-Zeno effect. In both cases frequent measurements of the number of atoms remaining trapped strongly affect the tunneling dynamics. The effect of incomplete measurements was also investigated, providing a key for understanding the ability to repeatedly redefine a new initial state.
© 2001 Optical Society of America
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