Authors
Rebekah Herrman, Phillip C Lotshaw, James Ostrowski, Travis S Humble, George Siopsis
Publication date
2022/4/26
Journal
Scientific Reports
Volume
12
Issue
1
Pages
6781
Publisher
Nature Publishing Group UK
Description
The quantum approximate optimization algorithm (QAOA) generates an approximate solution to combinatorial optimization problems using a variational ansatz circuit defined by parameterized layers of quantum evolution. In theory, the approximation improves with increasing ansatz depth but gate noise and circuit complexity undermine performance in practice. Here, we investigate a multi-angle ansatz for QAOA that reduces circuit depth and improves the approximation ratio by increasing the number of classical parameters. Even though the number of parameters increases, our results indicate that good parameters can be found in polynomial time for a test dataset we consider. This new ansatz gives a 33% increase in the approximation ratio for an infinite family of MaxCut instances over QAOA. The optimal performance is lower bounded by the conventional ansatz, and we present empirical results for graphs on …
Total citations
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Scholar articles
R Herrman, PC Lotshaw, J Ostrowski, TS Humble… - Scientific Reports, 2022