Divergences in the 2-qubits' Space: Werner and thermal states
We revisit the notion of using divergences, or relative-entropies, as measures of the distance between two mixed states, with special emphasis on power-law entropies. We analyze the Csisźar and Bregmantype q-divergences with reference to i) Werner states, and ii) thermal states obtained using a one-...
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| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2009
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/36276 http://www.m-hikari.com/ams/ams-password-2009/ams-password21-24-2009/plastinoAMS21-24-2009.pdf |
| Aporte de: |
| Sumario: | We revisit the notion of using divergences, or relative-entropies, as measures of the distance between two mixed states, with special emphasis on power-law entropies. We analyze the Csisźar and Bregmantype q-divergences with reference to i) Werner states, and ii) thermal states obtained using a one-dimensional Heisenberg two-spin chain with a magnetic field <i>B</i> along the <i>z</i>-axis. In both cases, we find that the q-Jensen-Shannon divergence enlarges the range of permissible powerlaw exponents, as compared to results of previous literature. It is also shown that this divergence-measure serves as a good indicator for critical phenomena in the Heisenberg model. |
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