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- W4287371511 abstract "We propose a modification of the Variational Quantum Eigensolver algorithm for electronic structure optimization using quantum computers, named non-unitary Variational Quantum Eigensolver (nu-VQE), in which a non-unitary operator is combined with the original system Hamiltonian leading to a new variational problem with a simplified wavefunction Ansatz. In the present work, we use, as non-unitary operator, the Jastrow factor, inspired from classical Quantum Monte Carlo techniques for simulation of strongly correlated electrons. The method is applied to prototypical molecular Hamiltonians for which we obtain accurate ground state energies with shallower circuits, at the cost of an increased number of measurements. Finally, we also show that this method achieves an important error mitigation effect that drastically improves the quality of the results for VQE optimizations on today's noisy quantum computers. The absolute error in the calculated energy within our scheme is one order of magnitude smaller than the corresponding result using traditional VQE methods, with the same circuit depth." @default.
- W4287371511 created "2022-07-25" @default.
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- W4287371511 date "2021-01-22" @default.
- W4287371511 modified "2023-09-27" @default.
- W4287371511 title "Improved accuracy on noisy devices by non-unitary Variational Quantum Eigensolver for chemistry applications" @default.
- W4287371511 doi "https://doi.org/10.48550/arxiv.2101.09316" @default.
- W4287371511 hasPublicationYear "2021" @default.
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