Stephen, David T. Theory, Max Planck Institute of Quantum Optics, Max Planck Society;
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Stephen, D. T., Nautrup, H. P., Bermejo-Vega, J., Eisert, J., & Raussendorf, R. (2019). Subsystem symmetries, quantum cellular automata, and computational phases of quantum matter. Quantum, 3: 142. doi:10.22331/q-2019-05-20-142.