# Universality and Optimality in the Information–Disturbance Tradeoff

@article{Hashagen2018UniversalityAO, title={Universality and Optimality in the Information–Disturbance Tradeoff}, author={Anna-Lena Hashagen and M. Wolf}, journal={Annales Henri Poincar{\'e}}, year={2018}, volume={20}, pages={219-258} }

We investigate the tradeoff between the quality of an approximate version of a given measurement and the disturbance it induces in the measured quantum system. We prove that if the target measurement is a non-degenerate von Neumann measurement, then the optimal tradeoff can always be achieved within a two-parameter family of quantum devices that is independent of the chosen distance measures. This form of almost universal optimality holds under mild assumptions on the distance measures such as… Expand

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