Measurement-based time evolution for quantum simulation of fermionic systems. Lee, W., Qin, Z., Raussendorf, R., Sela, E., & Scarola, V., W. Physical Review Research, 4(3):L032013, 7, 2022.
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Quantum simulation using time evolution in phase estimation-based quantum algorithms can yield unbiased solutions of classically intractable models. But long runtimes open such algorithms to decoherence. We show how measurement-based quantum simulation uses effective time evolution via measurement to allow runtime advantages over conventional circuit-based algorithms that use real-time evolution with quantum gates. We construct a hybrid algorithm to find energy eigenvalues in fermionic models using only measurements on graph states. We apply the algorithm to the Kitaev and Hubbard chains. Resource estimates show a runtime advantage if measurements can be performed faster than gates. Our work sets the stage to allow advances in measurement precision to improve quantum simulation.

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