Generalized measurements via a programmable quantum processor
Marián Roško, Vladimír Bužek, Paul Robert Chouha +1 more
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.
arXiv:quant-ph/0311172•Physical Review A•Dec 2, 2003•12 citations