Structure optimization for parameterized quantum circuits

Mateusz Ostaszewski; Edward Grant; Marcello Benedetti

doi:10.22331/q-2021-01-28-391

Structure optimization for parameterized quantum circuits

Mateusz Ostaszewski^1,2, Edward Grant^2,3, and Marcello Benedetti^2,4

¹Institute of Theoretical and Applied Informatics, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
²Department of Computer Science, University College London, WC1E 6BT London, United Kingdom
³Rahko Limited, N4 3JP London, United Kingdom
⁴Cambridge Quantum Computing Limited, CB2 1UB Cambridge, United Kingdom

Published:	2021-01-28, volume 5, page 391
Eprint:	arXiv:1905.09692v3
Doi:	https://doi.org/10.22331/q-2021-01-28-391
Citation:	Quantum 5, 391 (2021).

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Abstract

We propose an efficient method for simultaneously optimizing both the structure and parameter values of quantum circuits with only a small computational overhead. Shallow circuits that use structure optimization perform significantly better than circuits that use parameter updates alone, making this method particularly suitable for noisy intermediate-scale quantum computers. We demonstrate the method for optimizing a variational quantum eigensolver for finding the ground states of Lithium Hydride and the Heisenberg model in simulation, and for finding the ground state of Hydrogen gas on the IBM Melbourne quantum computer.

► BibTeX data

@article{Ostaszewski2021structure,
  doi = {10.22331/q-2021-01-28-391},
  url = {https://doi.org/10.22331/q-2021-01-28-391},
  title = {Structure optimization for parameterized quantum circuits},
  author = {Ostaszewski, Mateusz and Grant, Edward and Benedetti, Marcello},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {5},
  pages = {391},
  month = jan,
  year = {2021}
}

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