Quaternion networks, which use the same SU(2) rotation structure as single-qubit quantum gates, match or outperform depth-3 variational quantum circuits on MNIST, FashionMNIST, and CIFAR-10.
Nature Communications 11(1), 808 (2020)
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Classical $\mathrm{SU}(2)$ Models Match or Exceed Shallow Variational Quantum Circuits on Vision Benchmarks
Quaternion networks, which use the same SU(2) rotation structure as single-qubit quantum gates, match or outperform depth-3 variational quantum circuits on MNIST, FashionMNIST, and CIFAR-10.