There are certainly infinitely non-halting automata on deterministic electronic processors. Abstractly, in terms of constructor theory, the non-halting task is

There are certainly infinitely non-halting automata on deterministic electronic processors. Abstractly, in terms of constructor theory, the non-halting task is independent from a constructor, which is implemented with a computation medium. FWIU from reading a table on wikipedia about physical platforms for QC it would be possible to do quantum computing with just electron voltage but typical component quality. So phase; certain phases. And now parametic single photon emission and detection. "Low-noise balanced homodyne detection with superconducting nanowire single-photon detectors" (2024) https://news.ycombinator.com/item?id=39537236 https://news.ycombinator.com/item?id=39537236 "A physical [photonic] qubit with built-in error correction" (2024) https://news.ycombinator.com/item?id=39243929 https://news.ycombinator.com/item?id=39243929 "Quantum vortices of strongly interacting photons" (2024) https://www.science.org/doi/10.1126/science.adh5315 https://www.science.org/doi/10.1126/science.adh5315 .. https://arxiv.org/abs/2302.05967 https://arxiv.org/abs/2302.05967 .. "Study of photons in QC reveals photon collisions in matter create vortices" https://news.ycombinator.com/item?id=40600736 https://news.ycombinator.com/item?id=40600736 "How do photons mediate both attraction and repulsion?" (2025) [as phonons in matter] https://news.ycombinator.com/item?id=42661511 https://news.ycombinator.com/item?id=42661511 notes re: recent findings with photons ("quanta")