Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
qubits per logical qubit. “A fully fault-tolerant quantum computer based on the surface code assuming realistic error rates is predicted to require millions of physical qubits.” https://www.ncbi.nlm.nih.gov/books/NBK538709/ How to factor 2048 bit RSA integers in 8 hours using 20 million noisy