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Energetic Perspective on Rapid Quenches in Quantum Annealing

Callison, Adam; Festenstein, Max; Chen, Jie; Nita, Laurentiu; Kendon, Viv; Chancellor, Nicholas

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Adam Callison

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Max Festenstein
PGR Student Doctor of Philosophy

Jie Chen

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Laur Nita
PGR Student Doctor of Philosophy


There are well-developed theoretical tools to analyze how quantum dynamics can solve computational problems by varying Hamiltonian parameters slowly, near the adiabatic limit. On the other hand, there are relatively few tools to understand the opposite limit of rapid quenches, as used in quantum annealing and (in the limit of infinitely rapid quenches) in quantum walks. In this paper, we develop several tools that are applicable in the rapid-quench regime. Firstly, we analyze the energy expectation value of different elements of the Hamiltonian. From this, we show that monotonic quenches, where the strength of the problem Hamiltonian is consistently increased relative to fluctuation (driver) terms, will yield a better result on average than random guessing. Secondly, we develop methods to determine whether dynamics will occur locally under rapid-quench Hamiltonians and identify cases where a rapid quench will lead to a substantially improved solution. In particular, we find that a technique we refer to as “preannealing” can significantly improve the performance of quantum walks. We also show how these tools can provide efficient heuristic estimates for Hamiltonian parameters, a key requirement for practical application of quantum annealing.


Callison, A., Festenstein, M., Chen, J., Nita, L., Kendon, V., & Chancellor, N. (2021). Energetic Perspective on Rapid Quenches in Quantum Annealing. PRX Quantum, 2(1), Article 010338.

Journal Article Type Article
Acceptance Date Jan 21, 2021
Online Publication Date Mar 4, 2021
Publication Date 2021-03
Deposit Date Jun 23, 2021
Publicly Available Date Jun 23, 2021
Journal PRX Quantum
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 2
Issue 1
Article Number 010338


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Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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