Quantum Zeno Effect for Exponentially Decaying Systems

Details Quantum Zeno Effect for Exponentially Decaying Systems Quantum Zeno Effect for Exponentially Decaying Systems

2003-07-10

arxiv.org/abs/quant-ph/0307075v1

Phys. Rev. Lett. 92 030401 (2004)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.030401

The quantum Zeno effect -- suppression of decay by frequent measurements -- was believed to occur only when the response of the detector is so quick that the initial tiny deviation from the exponential decay law is detectable. However, we show that it can occur even for exactly exponentially decaying systems, for which this condition is never satisfied, by considering a realistic case where the detector has a finite energy band of detection. The conventional theories correspond to the limit of an infinite bandwidth. This implies that the Zeno effect occurs more widely than expected so far.

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