Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
chose a device of this size to be able to … investigate first and second order error-correction using the surface code…” https://ai.googleblog.com/2018/03/a-preview-of-bristlecone-googles-new.html Google recently gave an update and roadmap at their Quantum Summer Symposium for 2020: Day 1 opening