Monte Carlo Tree Search based Hybrid Optimization of Variational Quantum Circuits

• URL: http://arxiv.org/abs/2203.16707v1
• Date: Wed, 30 Mar 2022 23:15:21 GMT
• Title: Monte Carlo Tree Search based Hybrid Optimization of Variational Quantum Circuits
• Authors: Jiahao Yao, Haoya Li, Marin Bukov, Lin Lin, Lexing Ying
• Abstract summary: We propose a new variational quantum algorithm called MCTS-QAOA. It combines a Monte Carlo tree search method with an improved natural policy gradient solver to optimize the discrete and continuous variables in the quantum circuit. We find that MCTS-QAOA has excellent noise-resilience properties and outperforms prior algorithms in challenging instances of the generalized QAOA.
• Score: 7.08228773002332
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Variational quantum algorithms stand at the forefront of simulations on near-term and future fault-tolerant quantum devices. While most variational quantum algorithms involve only continuous optimization variables, the representational power of the variational ansatz can sometimes be significantly enhanced by adding certain discrete optimization variables, as is exemplified by the generalized quantum approximate optimization algorithm (QAOA). However, the hybrid discrete-continuous optimization problem in the generalized QAOA poses a challenge to the optimization. We propose a new algorithm called MCTS-QAOA, which combines a Monte Carlo tree search method with an improved natural policy gradient solver to optimize the discrete and continuous variables in the quantum circuit, respectively. We find that MCTS-QAOA has excellent noise-resilience properties and outperforms prior algorithms in challenging instances of the generalized QAOA.

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