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   Articles with "classical shadows" as a keyword



Measurements of Quantum Hamiltonians with Locally-Biased Classical Shadows

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recommendations! Published in 2022 at "Communications in Mathematical Physics"

DOI: 10.1007/s00220-022-04343-8

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… read more here.

Keywords: quantum hamiltonians; measurements quantum; biased classical; hamiltonians locally ... See more keywords

Quantum Computing Approach to Fixed-Node Monte Carlo Using Classical Shadows

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recommendations! Published in 2024 at "Journal of Chemical Theory and Computation"

DOI: 10.1021/acs.jctc.4c01468

Abstract: Quantum Monte Carlo (QMC) methods are powerful approaches for solving electronic structure problems. Although they often provide high-accuracy solutions, the precision of most QMC methods is ultimately limited by the trial wave function that must… read more here.

Keywords: monte; monte carlo; classical shadows; fixed node ... See more keywords
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A Bayesian analysis of classical shadows

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recommendations! Published in 2021 at "npj Quantum Information"

DOI: 10.1038/s41534-021-00447-6

Abstract: The method of classical shadows proposed by Huang, Kueng, and Preskill heralds remarkable opportunities for quantum estimation with limited measurements. Yet its relationship to established quantum tomographic approaches, particularly those based on likelihood models, remains… read more here.

Keywords: classical shadows; estimation; bayesian analysis; analysis classical ... See more keywords
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Enhancing quantum state reconstruction with structured classical shadows

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recommendations! Published in 2025 at "npj Quantum Information"

DOI: 10.1038/s41534-025-01101-1

Abstract: While classical shadows can efficiently predict key quantum state properties, their suitability for certified quantum state tomography remains uncertain. In this paper, we address this challenge by introducing a projected classical shadow (PCS) that extends… read more here.

Keywords: quantum state; enhancing quantum; state reconstruction; classical shadows ... See more keywords

In the Shadow of the Hadamard Test: Using the Garbage State for Good and Further Modifications.

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recommendations! Published in 2025 at "Physical review letters"

DOI: 10.1103/cqjw-kl8s

Abstract: The Hadamard test is one of the pillars on which quantum algorithm development rests and, at the same time, is naturally suited for the intermediate regime between the current era of noisy quantum devices and… read more here.

Keywords: shadow hadamard; classical shadows; test; hadamard test ... See more keywords

High-dimensional subspace expansion using classical shadows

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recommendations! Published in 2024 at "Physical Review A"

DOI: 10.1103/physreva.111.022423

Abstract: We introduce a postprocessing technique for classical shadow measurement data that enhances the precision of ground state estimation through high-dimensional subspace expansion; the dimensionality is only limited by the amount of classical postprocessing resources rather… read more here.

Keywords: subspace expansion; high dimensional; dimensional subspace; classical shadows ... See more keywords

Biased estimator channels for classical shadows

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recommendations! Published in 2024 at "Physical Review A"

DOI: 10.1103/physreva.111.l030402

Abstract: Extracting classical information from quantum systems is of fundamental importance, and classical shadows allow us to extract a large amount of information using relatively few measurements. Conventional shadow estimators are unbiased and thus agree with… read more here.

Keywords: biased estimator; channels classical; estimator channels; classical shadows ... See more keywords

Filtering Crosstalk from Bath Non-Markovianity via Spacetime Classical Shadows.

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recommendations! Published in 2022 at "Physical review letters"

DOI: 10.1103/physrevlett.130.160401

Abstract: From an open system perspective non-Markovian effects due to a nearby bath or neighboring qubits are dynamically equivalent. However, there is a conceptual distinction to account for: neighboring qubits may be controlled. We combine recent… read more here.

Keywords: neighboring qubits; filtering crosstalk; bath; classical shadows ... See more keywords