In quantum mechanics, errors are not just an annoying hindrance but a fundamental problem holding back the transition from experimental prototypes to real computing systems. A team of researchers from the University of Sydney and IBM has made a breakthrough by identifying one of the main "killers" of quantum computing — measurements taken directly during operations to correct errors. It turns out that the monitoring process itself provokes new, even more insidious errors.
Measurement as a Source of Instability
Traditionally, it was believed that constant monitoring of qubit states was a safeguard against decoherence. However, the study showed that the act of measurement, being an integral part of error correction algorithms, creates parasitic interference that accumulates and destroys the integrity of logical qubits. The scientists not only managed to identify this mechanism but also proposed specific methods to reduce its impact.
Practical Solutions for Improving Reliability
The developed approaches significantly enhance the stability of logical qubits — the fundamental building blocks of fault-tolerant systems. This means quantum computers will be able to perform long, complex calculations without critical error accumulation, which was previously unattainable. The results pave the way for creating machines capable of solving tasks beyond the reach of classical supercomputers — from modeling molecules to optimizing financial portfolios.
Expert opinion: This step can be compared to the invention of error-correcting codes in classical computing — without them, there would be no internet or modern processors. If the data is confirmed and scaled, we will witness the transition from "raw" quantum experiments to industrial computers. For the crypto industry, this is a signal: resistance to quantum attacks is ceasing to be a theoretical threat and is becoming a matter of the coming years.