Multi-qubit correction for quantum annealers.

Autor: Ayanzadeh R; College of Computing, Georgia Institute of Technology, Atlanta, GA, 30332, USA. ayanzadeh@gatech.edu., Dorband J; Computer Science and Electrical Engineering, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA., Halem M; Computer Science and Electrical Engineering, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA., Finin T; Computer Science and Electrical Engineering, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2021 Aug 09; Vol. 11 (1), pp. 16119. Date of Electronic Publication: 2021 Aug 09.
DOI: 10.1038/s41598-021-95482-w
Abstrakt: We present multi-qubit correction (MQC) as a novel postprocessing method for quantum annealers that views the evolution in an open-system as a Gibbs sampler and reduces a set of excited states to a new synthetic state with lower energy value. After sampling from the ground state of a given (Ising) Hamiltonian, MQC compares pairs of excited states to recognize virtual tunnels-i.e., a group of qubits that changing their states simultaneously can result in a new state with lower energy value-and successively converges to the ground state. Experimental results using D-Wave 2000Q quantum annealers demonstrate that MQC finds samples with notably lower energy values and improves the reproducibility of results when compared to recent hardware/software advances in the realm of quantum annealing, such as spin-reversal transforms, classical postprocessing techniques, and increased inter-sample delay between successive measurements.
(© 2021. The Author(s).)
Databáze: MEDLINE
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