I'm not an expert in quantum holography, but as far as I know, it's a kind of fault tolerance framework. If so, then the most fundamental layer of this technical route would still be qubits, only the requirements for scale or fidelity are looser. Actually I also believe in Fault Tolerant quantum computing, and many great works have been done. But the sad story is our lab chose a route that is not fault-tolerance friendly (at least for now), so I'm a little nervous. Anyway I hope the day will come soon.