There's widespread agreement that most useful quantum computing will have to wait for the development of error-corrected ... operations on logical qubits somewhat easier. For example, performing ...

Logical qubits are groupings of qubits connected via quantum entanglement. Instead of relying on redundant copies of information as an error-correcting protocol, logical qubit–based machines ...

This is an error in the spelling or grammar used when coding. Missing a letter, character or forgetting to include inverted commas/speech marks are common examples of ...