Counterdiabaticity and the quantum approximate optimization algorithm

Jonathan Wurtz and Peter J. Love

Department of Physics and Astronomy, Tufts University, Medford, Massachusetts 02155, USA

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The quantum approximate optimization algorithm (QAOA) is a near-term hybrid algorithm intended to solve combinatorial optimization problems, such as MaxCut. QAOA can be made to mimic an adiabatic schedule, and in the $p\to\infty$ limit the final state is an exact maximal eigenstate in accordance with the adiabatic theorem. In this work, the connection between QAOA and adiabaticity is made explicit by inspecting the regime of $p$ large but finite. By connecting QAOA to counterdiabatic (CD) evolution, we construct CD-QAOA angles which mimic a counterdiabatic schedule by matching Trotter "error" terms to approximate adiabatic gauge potentials which suppress diabatic excitations arising from finite ramp speed. In our construction, these "error" terms are helpful, not detrimental, to QAOA. Using this matching to link QAOA with quantum adiabatic algorithms (QAA), we show that the approximation ratio converges to one at least as $1-C(p)\sim 1/p^{\mu}$. We show that transfer of parameters between graphs, and interpolating angles for $p+1$ given $p$ are both natural byproducts of CD-QAOA matching. Optimization of CD-QAOA angles is equivalent to optimizing a continuous adiabatic schedule. Finally, we show that, using a property of variational adiabatic gauge potentials, QAOA is at least counterdiabatic, not just adiabatic, and has better performance than finite time adiabatic evolution. We demonstrate the method on three examples: a 2 level system, an Ising chain, and the MaxCut problem.

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[4] P. Chandarana, N. N. Hegade, K. Paul, F. Albarrán-Arriagada, E. Solano, A. del Campo, and Xi Chen, "Digitized-counterdiabatic quantum approximate optimization algorithm", Physical Review Research 4 1, 013141 (2022).

[5] Vladimir Kremenetski, Tad Hogg, Stuart Hadfield, Stephen J. Cotton, and Norm M. Tubman, "Quantum Alternating Operator Ansatz (QAOA) Phase Diagrams and Applications for Quantum Chemistry", arXiv:2108.13056.

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[7] Jiahao Yao, Haoya Li, Marin Bukov, Lin Lin, and Lexing Ying, "Monte Carlo Tree Search based Hybrid Optimization of Variational Quantum Circuits", arXiv:2203.16707.

[8] Johannes Weidenfeller, Lucia C. Valor, Julien Gacon, Caroline Tornow, Luciano Bello, Stefan Woerner, and Daniel J. Egger, "Scaling of the quantum approximate optimization algorithm on superconducting qubit based hardware", arXiv:2202.03459.

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[14] Jonathan Wurtz and Danylo Lykov, "Fixed-angle conjectures for the quantum approximate optimization algorithm on regular MaxCut graphs", Physical Review A 104 5, 052419 (2021).

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The above citations are from Crossref's cited-by service (last updated successfully 2022-10-04 21:20:33) and SAO/NASA ADS (last updated successfully 2022-10-04 21:20:34). The list may be incomplete as not all publishers provide suitable and complete citation data.