Unstable systems and quantum Zeno phenomena in quantum field theory

Details Unstable systems and quantum Zeno phenomena in quantum field theory Unstable systems and quantum Zeno phenomena in quantum field theory

2002-02-22

arxiv.org/abs/quant-ph/0202127v1

in Fundamental Aspects of Quantum Physics, L. Accardi and S. Tasaki eds., Quantum Probability and White Noise Analysis, Vol. 1

Physics

Quantum Physics

25 pages, 6 figures

Scientific paper

10.1142/9789812704412_0013

We analyze the Zeno phenomenon in quantum field theory. The decay of an unstable system can be modified by changing the time interval between successive measurements (or by varying the coupling to an external system that plays the role of measuring apparatus). We speak of quantum Zeno effect if the decay is slowed and of inverse quantum Zeno (or Heraclitus) effect if it is accelerated. The analysis of the transition between these two regimes requires close scrutiny of the features of the interaction Hamiltonian. We look in detail at quantum field theoretical models of the Lee type.

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