Quantum Annealing with Longitudinal Bias Fields

Tobias Graß
Phys. Rev. Lett. 123, 120501 – Published 18 September 2019
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Abstract

Quantum annealing aims at solving hard computational problems through adiabatic state preparation. Here, I propose to use inhomogeneous longitudinal magnetic fields to enhance the efficiency of the annealing. Such fields are able to bias the annealing dynamics into the desired solution, and in many cases, suitable field configurations can be found iteratively. Alternatively, the longitudinal fields can also be applied as an antibias which filters out unwanted contributions from the final state. This strategy is particularly well suited for instances which are difficult to solve within the standard quantum annealing approach. By numerically simulating the dynamics for small instances of the exact cover problem, the performance of these different strategies is investigated.

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  • Received 14 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.120501

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Tobias Graß

  • Joint Quantum Institute, NIST and University of Maryland, College Park, Maryland, 20742, USA and ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain

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Issue

Vol. 123, Iss. 12 — 20 September 2019

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