Quantum Update

Q: currrently what is the largest error free and approximation free quantum computer with 100% entangelement over the whole device?

Claude – That’s a very high bar — full connectivity, zero errors, no approximations, 100% entanglement fidelity across the entire device simultaneously.

The honest answer is: nobody meets your bar.

The best whole-device entanglement demonstrated on a superconducting device was 65 qubits on IBM’s Manhattan device, where bipartite entanglement spanning the full device was detected — but that’s bipartite entanglement, not full multi-partite entanglement, and it’s noisy, not error-free.

The best gate fidelity claim is Infleqtion at 99.73% on their neutral atom platform — meaning 0.27% error per gate, which compounds catastrophically over a deep circuit.

IBM’s roadmap puts their first genuinely fault-tolerant system, Starling, as a future construction target in Poughkeepsie — not yet built.

Your bar — 100% entanglement fidelity, error-free, approximation-free, whole device — doesn’t exist yet at any scale.