Oscillations of the purity in the repeated-measurement-based generation of quantum states
| Autor: | Militello, B., Yuasa, K., Nakazato, H., Messina, A. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 77, 042109 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.77.042109 |
| Popis: | Repeated observations of a quantum system interacting with another one can drive the latter toward a particular quantum state, irrespectively of its initial condition, because of an {\em effective non-unitary evolution}. If the target state is a pure one, the degree of purity of the system approaches unity, even when the initial condition of the system is a mixed state. In this paper we study the behavior of the purity from the initial value to the final one, that is unity. Depending on the parameters, after a finite number of measurements, the purity exhibits oscillations, that brings about a lower purity than that of the initial state, which is a point to be taken care of in concrete applications. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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