Journal ArticleDOI
Quantum Zeno effect without collapse of the wave packet
TLDR
The only experiment in which the Zeno effect has yet been clearly demonstrated, though, allows no conclusion on the necessity or validity of the projection postulate, as shown by calculating the outcome of the experiment on the basis of the standard three-level Bloch equations.Abstract:
The change of dynamics in a quantum system under frequent or continuous observation, known as the quantum Zeno effect, is generally derived from the projection or reduction of the wave-packet hypothesis that is the central postulate in the theory of quantum measurements The only experiment in which the Zeno effect has yet been clearly demonstrated, though, allows no conclusion on the necessity or validity of the projection postulate This is shown by calculating, in detail, the outcome of the experiment on the basis of the standard three-level Bloch equations These equations follow from the quantum theory of irreversible processes with no additional assumptions necessary, such as which part of the system serves as measuring apparatus or how efficient the measurement would beread more
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Journal ArticleDOI
The quantum-state diffusion model applied to open systems
Nicolas Gisin,Ian C. Percival +1 more
TL;DR: In this article, a model of a quantum system interacting with its environment is proposed in which the system is represented by a state vector that satisfies a stochastic differential equation, derived from a density operator equation such as the Bloch equation, and consistent with it.
Journal ArticleDOI
Acceleration of quantum decay processes by frequent observations
TL;DR: It is shown that the quantum Zeno effect is fundamentally unattainable in radiative or radioactive decay (because the required measurement rates would cause the system to disintegrate), but also that these processes may be accelerated by frequent measurements.
Journal ArticleDOI
Quantum Zeno effect by general measurements
TL;DR: In this paper, the authors considered a continuous measurement of the decay of an excited atom by a photodetector that detects a photon emitted from the atom upon decay, and showed that the form factor is renormalized as a backaction of the measurement, through which the decay dynamics is modified.
Journal ArticleDOI
Coherent control of molecular dynamics
Moshe Shapiro,Paul Brumer +1 more
TL;DR: In this article, the authors review the principles and some recent advances in the theory of coherent control of molecular processes and discuss some of its experimental realizations, including bichromatic and pump-dump control, interference between N-photons and M-photon processes.
Journal ArticleDOI
A Conceptual Analysis of Quantum Zeno; Paradox, Measurement, and Experiment
Dipankar Home,M.A.B. Whitaker +1 more
TL;DR: In this paper, it is argued that the quantum Zeno effect is a genuine result of quantum theory and current quantum measurement theory, independent of the projection postulate, and the effect is of very general nature and rests on analogous arguments to those involved in Bell's theories.