Comment on “On the quantum Zeno effect” by Nakazato et al.

Benedetto Militello, Anna Napoli

It is shown that a generalized quantum Zeno effect based on the introduction of a coherent coupling between several parts of a compound system can be responsible for neutralizing the effects of repeated measurements. To demonstrate this effect, we focus on a purification scheme based on iterated observations on an ancilla system put in interaction with the main one [Nakazato, Takazawa, Yuasa, Phys. Rev. Lett. {\bf 90}, 060401 (2003)]. We bring to light that a suitable Hilbert space partitioning due to an appropriate interaction can eliminate the effects of repeated wave function collapses the purification scheme is based on.

Hiromichi Nakazato, Mikio Namiki, Saverio Pascazio +1 more

Nan Qiu, Shu‐chao Wang, L. C. Kwek +1 more

A method of purification through Zeno-like measurements has been proposed by Nakazato and co-workers [H. Nakazato, T. Takazawa, and K. Yuasa, Phys. Rev. Lett. 90, 060401 (2003); H. Nakazato, M. Unoki, and K. Yuasa, Phys. Rev. A 70, 012303 (2004)]. A series of frequent measurements on a quantum system is demonstrated to result in the purification of another quantum system in interaction with the former. Inspired by this idea, we have designed a strategy to obtain entangled states through only two measurements. A deterministic purification method is also provided in this article.

Hiromichi Nakazato, Mikio Namiki, Saverio Pascazio +1 more

H. Fearn, Willis E. Lamb

This paper represents some assorted opinions of the authors, presented in a tutorial fashion, regarding the quantum Zeno effect. The paper attempts to answer the question, is the Zeno effect consistent with quantum mechanics?.

YONG‐DE ZHANG, Jian-Wei Pan, H. Rauch