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Figure 1 | EPJ Quantum Technology

Figure 1

From: Qualifying quantum approaches for hard industrial optimization problems. A case study in the field of smart-charging of electric vehicles

Figure 1

Principle of the QAOA algorithm. A quantum processor, which can be operated in either digital or analog mode, is used to prepare an ansatz wavefunction from which we construct the mean value \(\langle \hat{C} \rangle _{\mathrm{obs}}\) using numerous measurements. A classical optimizer then updates the variational parameters. Some problems are naturally tailored to the analog mode of the platform, while others require a digital mapping. In digital mode, the unitaries are built from quantum circuits, made of elementary quantum gates acting each on one or a few qubits. In the analog mode, the unitaries are built from sequences of Hamiltonians that can be controlled in a continuous manner

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