Quantum Optimization for Training Quantum Neural Networks

• URL: http://arxiv.org/abs/2103.17047v1
• Date: Wed, 31 Mar 2021 13:06:30 GMT
• Title: Quantum Optimization for Training Quantum Neural Networks
• Authors: Yidong Liao, Min-Hsiu Hsieh, Chris Ferrie
• Abstract summary: We devise a framework for leveraging quantum optimisation algorithms to find optimal parameters of QNNs for certain tasks. We coherently encode the cost function of QNNs onto relative phases of a superposition state in the Hilbert space of the network parameters.
• Score: 16.780058676633914
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Training quantum neural networks (QNNs) using gradient-based or gradient-free classical optimisation approaches is severely impacted by the presence of barren plateaus in the cost landscapes. In this paper, we devise a framework for leveraging quantum optimisation algorithms to find optimal parameters of QNNs for certain tasks. To achieve this, we coherently encode the cost function of QNNs onto relative phases of a superposition state in the Hilbert space of the network parameters. The parameters are tuned with an iterative quantum optimisation structure using adaptively selected Hamiltonians. The quantum mechanism of this framework exploits hidden structure in the QNN optimisation problem and hence is expected to provide beyond-Grover speed up, mitigating the barren plateau issue.

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