QuEra claims quantum error correction breakthrough with 2-to-1 qubit ratio
Quantum computers are prone to high error rates, so, to make qubits usable, a lot of redundancy is required. It typically takes hundreds—even thousands—of physical qubits to make one usable, “logical” qubit. This has been a major obstacle to the development of practical quantum computers. If thousands of qubits are needed for a quantum computer to do anything useful, and it takes a thousand phy…