Measure Now, Mitigate Later: Virtual Error Cancellation for Logical Quantum Circuits
Virtual Error Cancellation (VEC) is a new technique that mitigates uncorrectable logical errors in quantum circuits using only syndrome records from quantum execution. It bypasses the need for prior noise characterization or circuit modifications by employing a dual-decoder protocol. This method reduces sampling overhead beyond current limits, proving syndrome data can correct universal computational estimates post-execution.