Tag
#threshold theorem
1 article
- Fixing Broken Qubits: How the Surface Code Makes Fault-Tolerant Quantum Computing Possible
Every qubit in a quantum processor makes mistakes — not sometimes, but continuously. Quantum error correction doesn't prevent errors; it encodes logical qubits redundantly across many physical ones so that errors can be detected and corrected without ever directly measuring the quantum state. Here is how the surface code achieves this, what the overhead actually costs, and why Google's 2023 demonstration changed the field.
