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Nuovo cimento della Società italiana di fisica. A, Nuclei, particles and fields

Does the lifetime of an unstable system depend on the measuring apparatus?

A. Degasperis, Luciano Fonda, G. C. Ghirardi

Published Jun 1, 1974• 122 citations
Publisher
DOI
10.1007/bf02731351

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After reviewing the description of an unstable state in the framework of nonrelativistic Quantum Mechanics (QM) and relativistic Quantum Field Theory (QFT), we consider the effect of pulsed, ideal measurements repeated at equal time intervals on the lifetime of an unstable system. In particular, we investigate the case in which the ‘bare’ survival probability is an exact exponential (a very good approximation in both QM and QFT), but the measurement apparatus can detect the decay products only in a certain energy range. We show that the Quantum Zeno Effect can occur in this framework as well.