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Abstract: We study the measurement-induced enhancement of the spontaneous decay calledquantum anti-Zeno effect for a two-level subsystem, where measurements aretreated as couplings between the excited state and an auxiliary state ratherthan the von Neumann-s wave function reduction. The photon radiated in a fastdecay of the atom, from the auxiliary state to the excited state, triggers aquasi-measurement, as opposed to a projection measurement. Our use of the term-quasi-measurement- refers to a -coupling-based measurement-. Such frequentquasi-measurements result in an exponential decay of the survival probabilityof atomic initial state with a photon emission following eachquasi-measurement. Our calculations show that the effective decay rate is ofthe same form as the one based on projection measurements. What is moreimportant, the survival probability of the atomic initial state which isobtained by tracing over all the photon states is equivalent to the survivalprobability of the atomic initial state with a photon emission following eachquasi-measurement to the order under consideration. That is because thecontributions from those states with photon number less than the number ofquasi-measurements originate from higher-order processes.



Autor: Qing Ai, Dazhi Xu, Su Yi, A. G. Kofman, C. P. Sun, Franco Nori

Fuente: https://arxiv.org/







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