Figure 1

Optimal information-disturbance tradeoff in estimating an unknown maximally entangled state for dimension $d=2$ (solid line), $d=4$ (dashed line), and $d=8$ (dotted line), where $I$ and $D$ are defined through Eqs. (25, 26) in terms of the estimation and operation fidelities $G$ and $F$, respectively. For given value of the retrieved information $I$, the curves $D(I)$ are a lower bound for the disturbance of any measurement instrument.Reuse & Permissions