APS » PROLA » Phys. Rev. A » Volume 57 » Issue 4

Phys. Rev. A 57, 2319 - 2324 (1998)

Inferring the density matrix for a system of an unknown Hamiltonian

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A. Rigo1, M. Casas1, and A. Plastino2,3
1Departament de Física, Universitat de les Illes Balears, 07071 Palma de Mallorca, Spain
2National University La Plata, Casilla de Correo 727, 1900 La Plata, Argentina
3Argentine National Council (CONICET), Casilla de Correo 727, 1990 La Plata, Argentina

Received 7 July 1997; revised 4 November 1997

An approximate inference approach is advanced in order to determine the density matrix in cases in which the pertinent Hamiltonian is unknown, and the available expectation values pertain to noncommuting observables. The inference of both pure and mixed states is addressed, and on an equal footing, without facing infinities in the pure state limit. Information-theoretical tools are employed.


©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRA/v57/p2319
DOI: 10.1103/PhysRevA.57.2319
PACS: 03.65.Ca

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