Communication of spin directions with product states and finite measurements
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
Baig i Aleu, Marià, 1955- (Universitat Autònoma de Barcelona. Departament de Física)
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Fecha:	2001
Resumen:	Total spin eigenstates can be used to intrinsically encode a direction, which can later be decoded by means of a quantum measurement. We study the optimal strategy that can be adopted if, as is likely in practical applications, only product states of N spins are available. We obtain the asymptotic behavior of the average fidelity, which provides a proof that the optimal states must be entangled. We also give a prescription for constructing finite measurements for general encoding eigenstates.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Physical review. A, Vol. 64, Issue 2 (July 2001) , p. 022305-1-022305-4, ISSN 1050-2947

DOI: 10.1103/PhysRevA.64.022305

4 p, 72.1 KB

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