Supervised learning with quantum-enhanced feature spaces, Vojtěch Havlíček, Antonio D. Córcoles, Kristan Keisler, Bram W. Sheldon, Alexis Williams, Jonathan M. Chow, Jerry M. Gambetta, 2019Nature, Vol. 567DOI: 10.1038/s41586-019-0980-2 - This seminal work introduced the concept of quantum feature maps for classical data and demonstrated the implementation of a Quantum Support Vector Machine (QSVM) on a quantum processor, providing a foundation for the quantum kernel methods discussed.
Supervised Learning with Quantum Computers, Maria Schuld, Francesco Petruccione, 2018 (Springer)DOI: 10.1007/978-3-319-96424-9 - This book provides a thorough academic presentation of quantum machine learning, including detailed sections on quantum kernel methods, feature maps, and the theoretical and practical considerations for Quantum Support Vector Machines (QSVM).
Quantum Kernel Methods, Qiskit Community and Contributors, 2024 - A practical guide from the Qiskit machine learning module, demonstrating the implementation of quantum kernels and QSVM, including code examples and explanations of feature map selection and kernel matrix computation.
The effect of data encoding on the expressibility and trainability of quantum machine learning models, Suppawong Thanasilp, Samson Wang, Nhat A. Nguyen, M. S. Ramchander, Alessandro Santagati, Victor V. Albert, M. Cerezo, Patrick J. Coles, 2023Quantum, Vol. 7 (Quantum)DOI: 10.22331/q-2023-05-18-1007 - This paper investigates how different data encoding strategies in quantum feature maps influence the expressivity and trainability of quantum machine learning models, directly addressing issues like kernel concentration and their impact on model performance.