QUANT-PHLGAug 25, 2024

Verifiable cloud-based variational quantum algorithms

arXiv:2408.13713v32 citationsh-index: 6
Originality Synthesis-oriented
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This work addresses security and reliability problems for clients using cloud quantum computing, though it appears incremental as it builds on prior protocols.

The paper tackles the lack of verifiability and channel loss issues in cloud-based variational quantum algorithms, introducing a new protocol that enhances both aspects for more secure and practical quantum machine learning.

Variational quantum algorithms (VQAs) have shown potential for quantum advantage with noisy intermediate-scale quantum (NISQ) devices for quantum machine learning (QML). However, given the high cost and limited availability of quantum resources, delegating VQAs via cloud networks is a more practical solution for clients with limited quantum capabilities. Recently, Shingu et al.[Physical Review A, 105, 022603 (2022)] proposed a variational secure cloud quantum computing protocol, utilizing ancilla-driven quantum computation (ADQC) for cloud-based VQAs with minimal quantum resource consumption. However, their protocol lacks verifiability, which exposes it to potential malicious behaviors by the server. Additionally, channel loss requires frequent re-delegation as the size of the delegated variational circuit grows, complicating verification due to increased circuit complexity. This paper introduces a new protocol to address these challenges and enhance both verifiability and tolerance to channel loss in cloud-based VQAs.

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