Physics – Quantum Physics
Scientific paper
2007-04-12
J. Phys.: Conf. Ser. 67, 012043 (2007).
Physics
Quantum Physics
7 pages, To appear in DICE 2006 (Decoherence Information Complexity and Entropy) conference proceedings
Scientific paper
10.1088/1742-6596/67/1/012043
The quantum Zeno effect arises due to frequent observation. That implies the existence of some experimenter and its interaction with the system. In this contribution, we examine what happens for a closed system if one considers a quantum Zeno type of question, namely: "what is the probability of a system, remaining always in a particular subspace". This has implications to the arrival time problem that is also discussed. We employ the decoherent histories approach to quantum theory, as this is the better developed formulation of closed system quantum mechanics, and in particular, dealing with questions that involve time in a non-trivial way. We get a very restrictive decoherence condition, that implies that even if we do introduce an environment, there will be very few cases that we can assign probabilities to these histories, but in those cases, the quantum Zeno effect is still present.
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