Data di Pubblicazione:
2006
Citazione:
Instruments and mutual entropies in quantum information / A. Barchielli, G. Lupieri - In: Quantum probability / [a cura di] Marek Bożejko, Wojciech Młotkowski, Janusz Wysoczański. - Warszawa : Instytut Matematyczny PAN, 2006. - pp. 65-80 (( Intervento presentato al 25. convegno QP Conference on quantum probability and related topics tenutosi a Będlewo, Poland nel 2004.
Abstract:
General quantum measurements are represented by instruments. In this paper the mathematical formalization is given of the idea that an instrument is a channel which accepts a quantum state as input and produces a probability and an a posteriori state as output. Then, by using mutual entropies on von Neumann algebras and the identification of instruments and channels, many old and new informational inequalities are obtained in a unified manner. Such inequalities involve various quantities which characterize the performances of the instrument under study; in particular, these inequalities include and generalize the famous Holevo's bound.
Tipologia IRIS:
03 - Contributo in volume
Elenco autori:
A. Barchielli, G. Lupieri
Link alla scheda completa:
Titolo del libro:
Quantum probability