Local trade-off between information and disturbance in quantum measurements

Hiroaki Terashima

Published 2020-09-23Version 1

This study confirms a local trade-off between information and disturbance in quantum measurements, and establishes the correlation between the changes in these two quantities when the measurement is slightly modified. The correlation indicates that when the measurement is modified to increase the obtained information, the disturbance also increases. However, the information can be increased while decreasing the disturbance because the correlation is not necessarily perfect. For measurements with imperfect correlation between the information and disturbance, this paper discusses a general scheme that raises the amount of information in the measurement while diminishing the disturbance.