Fig. 2: Realizing the algorithm. | npj Quantum Information

Fig. 2: Realizing the algorithm.

From: A variational toolbox for quantum multi-parameter estimation

Fig. 2

Realization of the approach proposed in Fig. 1 for the encoding of Eq. (7). a On a sensing platform or during its emulation, the output probabilities are directly computed from the POVM measurements. The derivatives are computed using the parameter-shift rule. b When simulating on a quantum computer, the action of the noise channel is simulated by altering the POVM. The derivatives are computed by measuring the expectation values of a set of operators, used in training the network.

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