German Startup SaxonQ Launches 128-qubit and 512-qubit Diamond Quantum Computers That Skip Cryogenics Entirely
SaxonQ, a Leipzig University spinout, announced commercial availability of its SXQ128 and SXQ512 diamond nitrogen-vacancy quantum computers, which it says are the first NV-center systems to exceed 10 physical qubits. Both run at room temperature on standard wall power and slot into a normal server rack, and the company already has earlier-generation systems deployed at the German Aerospace Center and Fraunhofer IWU. SaxonQ took a seven-figure investment from Saxony's state tech fund TGFS in November 2025 and holds over 220 patents.
Every hardware maker with real investor attention right now, IBM, D-Wave, Rigetti, IonQ, Quantinuum, depends on cryogenics or vacuum systems as a real cost and infrastructure moat. A diamond NV-center architecture that genuinely skips that infrastructure at scale would be a legitimate competitive threat to that whole category.
Named deployed customers make this more credible than most triple-digit qubit claims. But no gate fidelity, coherence time, or connectivity figures were disclosed, so "512 qubits" here is not comparable to 512 qubits on a superconducting or trapped-ion system. This is a name to watch, not yet a proven competitor.