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EnglishA ``decoherent'' measurement is a dephasing plus tracing out plus triorthogonal decomposition. Dephasing can happen any time when a small system is coupled with a large reservoir: It is in principle reversible. But in order to have a measurement we also need the tracing out and the triorthogonal decomposition. The first requirement is observation-dependent (because environment plus apparatus plus object system eventually remain in a superposition). But the second one is an irreversible and irrelative change: In the presence of three ``systems'' the basis degeneracy problem disappears, i.e. there can be diagonalization only relatively to an observable (the measured one).
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| Titolo: | Decoherence and Triorthogonal Decomposition |
| Autori: | |
| Data di pubblicazione: | 2004 |
| Rivista: | |
| Abstract: | A ``decoherent'' measurement is a dephasing plus tracing out plus triorthogonal decomposition. Dephasing can happen any time when a small system is coupled with a large reservoir: It is in principle reversible. But in order to have a measurement we also need the tracing out and the triorthogonal decomposition. The first requirement is observation-dependent (because environment plus apparatus plus object system eventually remain in a superposition). But the second one is an irreversible and irrelative change: In the presence of three ``systems'' the basis degeneracy problem disappears, i.e. there can be diagonalization only relatively to an observable (the measured one). |
| Handle: | http://hdl.handle.net/11580/21444 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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