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Relative states, quantum axes, and quantum references
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
Iblisdir, S. (Université de Genève. GAP-Optique)
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data: 2006
Resum: We address the problem of measuring the relative angle between two “quantum axes” made out of N1 and N2 spins. Closed forms of our fidelitylike figure of merit are obtained for an arbitrary number of parallel spins. The asymptotic regimes of large N1 and/or N2 are discussed in detail. The extension of the concept “quantum axis” to more general situations is addressed. We give optimal strategies when the first quantum axis is made out of parallel spins whereas the second is a general state made out of two spins.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Publicat a: Physical review. A, Vol. 73, Issue 2 (February 2006) , p. 022341-1-22341-6, ISSN 1050-2947

DOI: 10.1103/PhysRevA.73.022341

6 p, 97.0 KB

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