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001     996121
005     20230929112511.0
024 7 _ |a 10.1103/PhysRevApplied.19.024047
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037 _ _ |a FZJ-2023-01121
082 _ _ |a 530
100 1 _ |a Jattana, Manpreet Singh
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245 _ _ |a Improved Variational Quantum Eigensolver Via Quasidynamical Evolution
260 _ _ |a College Park, Md. [u.a.]
|c 2023
|b American Physical Society
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520 _ _ |a The variational quantum eigensolver (VQE) is a hybrid quantum classical algorithm designed for current and near-term quantum devices. Despite its initial success, there is a lack of understanding involving several of its key aspects. There are problems with VQE that forbid a favorable scaling towards quantum advantage. In order to alleviate the problems, we propose and extensively test a quantum annealing inspired heuristic that supplements VQE. The improved VQE enables an efficient initial state-preparation mechanism, in a recursive manner, for a quasidynamical unitary evolution. We conduct an in-depth scaling analysis of finding the ground-state energies with increasing lattice sizes of the Heisenberg model, employing simulations of up to 40 qubits that manipulate the complete state vector. In addition to systematically finding the ground-state energy, we observe that it avoids barren plateaus, escapes local minima, and works with low-depth circuits. For the current devices, we further propose a benchmarking toolkit using a mean-field model and test it on IBM Q devices. Realistic gate execution times estimate a longer computational time to complete the same computation on a fully functional error-free quantum computer than on a quantum computer emulator implemented on a classical computer. However, our proposal can be expected to help accurate estimations of the ground-state energies beyond 50 qubits when the complete state vector can no longer be stored on a classical computer, thus enabling quantum advantage.
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536 _ _ |a OpenSuperQ - An Open Superconducting Quantum Computer (820363)
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536 _ _ |a PhD no Grant - Doktorand ohne besondere Förderung (PHD-NO-GRANT-20170405)
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700 1 _ |a Jin, Fengping
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700 1 _ |a De Raedt, Hans
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700 1 _ |a Michielsen, Kristel
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|e Corresponding author
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773 _ _ |a 10.1103/PhysRevApplied.19.024047
|g Vol. 19, no. 2, p. 024047
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|t Physical review applied
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|y 2023
|x 2331-7019
856 4 _ |u https://juser.fz-juelich.de/record/996121/files/Invoice_INV_23_JAN_010262.pdf
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