There are a few real directions that sound close to this, and I'm not sure which one you mean. Qudits use d-level systems rather than two-level ones. Continuou

There are a few real directions that sound close to this, and I'm not sure which one you mean. Qudits use d-level systems rather than two-level ones. Continuous-variable quantum computing, which most photonic approaches use, works in infinite-dimensional Hilbert spaces instead of discrete qubits — NTT and OptQC just announced a partnership aiming at a million-qubit-class optical machine on that basis. Analog quantum simulation skips gates entirely; QuEra's Aquila runs that way. And holographic error correcting codes like HaPPY come out of AdS/CFT. Any of those gets you more information per physical system than a qubit does. Which one are you pointing at, or is this something separate? Worth adding that Hassinger was emphatic that every modality still has open scientific questions, not just superconducting. Photonic and neutral atom approaches are underrepresented in our coverage and I'd like to fix that in a future session.