Fig. 2: Estimating multiple parameters with collective measurements on finite copies of the probe state. | npj Quantum Information

Fig. 2: Estimating multiple parameters with collective measurements on finite copies of the probe state.

From: Efficient computation of the Nagaoka–Hayashi bound for multiparameter estimation with separable measurements

Fig. 2

Both figures show how the gap between the Holevo and Nagaoka–Hayashi bounds shrinks as the number of copies of the probe state increases for estimating two (a) and three (b) parameters. The Nagaoka–Hayashi bounds are rescaled by the number of copies of the probe state to account for the resources used.

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