The evolution of a quantum system undergoing very frequent measurements takes place in a proper subspace of the total Hilbert space (quantum Zeno effect). The dynamical properties of this evolution are investigated and several examples are considered. a 2000 Elsevier Science B.V. All rights reserved.
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Univ Bari, Dipartimento Matemat, Ist Nazl Fis Nucl, I-70125 Bari, ItalyUniv Bari, Dipartimento Matemat, Ist Nazl Fis Nucl, I-70125 Bari, Italy
Facchi, Paolo
Marmo, Giuseppe
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Univ Naples Federico II, Ist Nazl Fis Nucl, Dipartimento Sci Fis, I-80126 Naples, ItalyUniv Bari, Dipartimento Matemat, Ist Nazl Fis Nucl, I-70125 Bari, Italy
Marmo, Giuseppe
Pascazio, Saverio
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Univ Bari, Ist Nazl Fis Nucl, Dipartimento Fis, I-70126 Bari, ItalyUniv Bari, Dipartimento Matemat, Ist Nazl Fis Nucl, I-70125 Bari, Italy