title: Purification through Zeno-like measurements.
abstract: A series of frequent measurements on a quantum system (Zeno-like measurements) is shown to result in the "purification" of another quantum system in interaction with the former. Even though the measurements are performed on the former system, their effect drives the latter into a pure state, irrespectively of its initial (mixed) state, provided certain conditions are satisfied.
authors.affiliation: Department of Physics, Waseda University, Tokyo 169-8555, Japan. hiromichi@waseda.jp
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Nakazato
authors.forename: Tomoko
authors.initials: T
authors.lastname: Takazawa
authors.forename: Kazuya
authors.initials: K
authors.lastname: Yuasa