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What does an observed quantum system reveal to its observer ?

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arxiv quant-ph/0009021 v2 pith:5USEB6QP submitted 2000-09-05 quant-ph

What does an observed quantum system reveal to its observer ?

classification quant-ph
keywords quantumeffectobservationsystemevenatomattemptbecomes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The evolution of a quantum system under observation becomes retarded or even impeded. We review this ``quantum Zeno effect'' in the light of the criticism that has been raised upon a previous attempt to demonstrate it, of later reexaminations of both the projection postulate and the significance of the observations, and of the results of a recent experiment on an individual cold atom. Here, the micro-state of the quantum system gets unveiled with the observation, and the effect of measurement is no longer mixed up with dephasing the object's wave function by the reactive effect of the detection. A procedure is outlined that promises to provide, by observation, an upper limit for the delay of even an exponential decay.

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