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- W142377432 abstract "In this article we propose an alternate model for the so called {it protective measurements}, more appropriately {it adiabatic measurements} of a spin 1/2 system where the {it apparatus} is also a quantum system with a {em finite dimensional Hilbert space}. This circumvents several technical as well as conceptual issues that arise when dealing with an infinite dimensional Hilbert space as in the analysis of conventional Stern-Gerlach experiment. Here also it is demonstrated that the response of the detector is continuous and it {it directly} measures {em expectation values without altering the state of the system}(when the unknown original state is a {it nondegenerate eigenstate of the system Hamiltonian}, in the limit of {em ideal} adiabatic conditions. We have also computed the corrections arising out of the inevitable departures from ideal adiabaticity i.e the time of measurement being large but finite. To overcome the {em conceptual} difficulties with a {it quantum apparatus}, we have simulated a {it classical apparatus} as a {em large} assembly of spin-1/2 systems. We end this article with a conclusion and a discussion of some future issues." @default.
- W142377432 created "2016-06-24" @default.
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- W142377432 date "2004-10-13" @default.
- W142377432 modified "2023-09-27" @default.
- W142377432 title "An alternate model for protective measurements of two-level systems" @default.
- W142377432 hasPublicationYear "2004" @default.
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