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- W3037811760 abstract "Abstract Obtaining precise estimates of quantum observables is a crucial step of variational quantum algorithms. We consider the problem of estimating expectation values of quantum Hamiltonians, obtained on states prepared on a quantum computer. We propose a novel estimator for this task, which is locally optimised with knowledge of the Hamiltonian and a classical approximation to the underlying quantum state. Our estimator is based on the concept of classical shadows of a quantum state, and has the important property of not adding to the circuit depth for the state preparation. We test its performance numerically for molecular Hamiltonians of increasing size, finding a sizable reduction in variance with respect to current measurement protocols that do not increase circuit depths." @default.
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- W3037811760 date "2022-03-30" @default.
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- W3037811760 title "Measurements of Quantum Hamiltonians with Locally-Biased Classical Shadows" @default.
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- W3037811760 doi "https://doi.org/10.1007/s00220-022-04343-8" @default.
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