Generalized measurements via programmable quantum processor

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Authors	ROŠKO C. BUŽEK Vladimír CHOUHA P.R. HILLERY M.
Year of publication	2003
Type	Article in Periodical
Magazine / Source	Physical Review A
MU Faculty or unit	Faculty of Informatics
Citation
Field	Informatics
Keywords	measurement; processor
Description	We show that it is possible to control the trade-off between information gain and disturbance in generalized measurements of qudits by utilizing a programmable quantum processor. This universal quantum machine allows us to perform a generalized measurement on the initial state of the input qudit to construct a Husimi function of this state. The trade-off between the gain and the disturbance of the qudit is controlled by the initial state of ancillary system that acts as a program for the quantum-information distributor. The trade-off fidelity does not depend on the initial state of the qudit.
Related projects:	Quantum information processing Non-sequential Models of Computing -- Quantum and Concurrent Distributed Models of Computing