Quantum field theory and dense measurement

被引:0
作者
Bar, D [1 ]
机构
[1] Bar Ilan Univ, Dept Phys, Ramat Gan, Israel
关键词
quantum field theory; Zeno effect; Feynman diagrams;
D O I
10.1023/A:1024481630621
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We show, using quantum field theory (QFT), that performing a large number of identical repetitions of the same measurement does not only preserve the initial state of the wave function (the Zeno effect), but also produces additional physical effects. We first discuss the Zeno effect in the framework of QFT, that is, as a quantum field phenomenon. We then derive it from QFT for the general case in which the initial and final states are different. We use perturbation theory and Feynman diagrams and refer to the measurement act as an external constraint upon the system that corresponds to the perturbative diagram that denotes this constraint. The basic physical entities dealt with in this work are not the conventional once-perfomed physical processes, but their n times repetition where n tends to infinity. We show that the presence of these repetitions entails the presence of additional excited state energies, and the absence of them entails the absence of these excited energies.
引用
收藏
页码:443 / 463
页数:21
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