Quantum Zeno Effect for Exponentially Decaying Systems
Abstract
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 thus far.
 Publication:

Physical Review Letters
 Pub Date:
 January 2004
 DOI:
 10.1103/PhysRevLett.92.030401
 arXiv:
 arXiv:quantph/0307075
 Bibcode:
 2004PhRvL..92c0401K
 Keywords:

 03.65.Xp;
 03.65.Yz;
 06.20.Dk;
 Tunneling traversal time quantum Zeno dynamics;
 Decoherence;
 open systems;
 quantum statistical methods;
 Measurement and error theory;
 Quantum Physics
 EPrint:
 4 pages, 3 figures