Qubits are fragile. Environmental noise, imperfect operations, and decoherence introduce errors that can corrupt a quantum calculation. Fault-tolerant quantum computing (FTQC) solves this by using quantum error correction protocols to detect and fix errors faster than they accumulate.
Achieving FTQC is widely regarded as the defining milestone for commercially useful quantum computing. It requires massive qubit counts, which is why Quantum Motion’s silicon approach focuses on manufacturing scalability as the path to the million-qubit systems that fault tolerance demands.