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QIS

Seminar

Repeatable measurements without eigenstates

Buscemi, F (Pavia)
Friday 19 November 2004, 14:00-14.45

Seminar Room 1, Newton Institute

Abstract

We show that, contrarily to the widespread belief, in quantum mechanics repeatable measurements are not necessarily described by orthogonal projectors-the customary paradigm of observable. Nonorthogonal repeatability, however, occurs only for infinite dimensions. We also show that when a non orthogonal repeatable measurement is performed, the measured system retains some "memory" of the number of times that the measurement has been performed.

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