APA
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Kiss, O., Grossi, M., Lougovski, P., Sanchez, F., Vallecorsa, S., & Papenbrock, T. (2022). Quantum computing of the 6Li nucleus via ordered unitary coupled clusters. Phys. Rev. C, 106(3), 034325. https://doi.org/10.1103/PhysRevC.106.034325
Chicago/Turabian
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Kiss, Oriel, Michele Grossi, Pavel Lougovski, Federico Sanchez, Sofia Vallecorsa, and Thomas Papenbrock. “Quantum Computing of the 6Li Nucleus via Ordered Unitary Coupled Clusters.” Phys. Rev. C 106, no. 3 (September 2022): 034325.
MLA
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Kiss, Oriel, et al. “Quantum Computing of the 6Li Nucleus via Ordered Unitary Coupled Clusters.” Phys. Rev. C, vol. 106, no. 3, American Physical Society, Sept. 2022, p. 034325, doi:10.1103/PhysRevC.106.034325.
BibTeX Click to copy
@article{kiss2022a,
title = {Quantum computing of the 6Li nucleus via ordered unitary coupled clusters},
year = {2022},
month = sep,
issue = {3},
journal = {Phys. Rev. C},
pages = {034325},
publisher = {American Physical Society},
volume = {106},
doi = {10.1103/PhysRevC.106.034325},
author = {Kiss, Oriel and Grossi, Michele and Lougovski, Pavel and Sanchez, Federico and Vallecorsa, Sofia and Papenbrock, Thomas},
month_numeric = {9}
}
We apply VQE to the problem of finding ground and excited state energies of the odd-odd nucleus 6Li. We study the effects of ordering fermionic excitation operators in the unitary coupled clusters ansatz on the VQE algorithm convergence by using only operators preserving the Jz quantum number. The accuracy is improved by two orders of magnitude in the case of descending order. We first compute optimal ansatz parameter values using a classical state-vector simulator with arbitrary measurement accuracy and then use those values to evaluate energy eigenstates of 6Li on a superconducting quantum chip from IBM. We post-process the results by using error mitigation techniques and are able to reproduce the exact energy with an error of 3.8% and 0.1% for the ground state and for the first excited state of 6Li, respectively.
