Breakthrough in quantum computing: logical qubit survival rate reaches 96% on IBM Heron processor
Quantum computing is approaching a new milestone. A group of researchers from the University of Sydney, in collaboration with IBM engineers, has achieved a significant increase in the stability of logical qubits—a key element for building fault-tolerant quantum systems. In experiments on the advanced 156-qubit superconducting processor IBM Quantum Heron r2, they managed to raise the survival rate of logical qubits per error correction cycle from less than 90% to an impressive 96%.
The Main Enemy: "Idle Noise"
The primary obstacle to creating stable quantum machines is the so-called "idle noise." It occurs when the system is forced to perform intermediate measurements of qubits for diagnostics and error correction. During these pauses, the remaining components of the processor lose quantum coherence, generating new errors and negating correction efforts.
To solve this problem, physicists completely redesigned the architecture of error correction circuits. The main innovation lies in radically reducing the computation downtime during checks. Optimization of algorithms minimized idle periods and, as a result, sharply increased the accuracy of logical qubits.
Practical Significance and Prospects
Project leader and director of Sydney Nano, Stephen Bartlett, emphasized that the error correction process is repeated multiple times at each stage of computation. Forced downtime of other elements becomes a "serious obstacle" to reliable operation. The new method significantly mitigates this issue.
Although the result was obtained in laboratory conditions on a single processor, its significance for the industry cannot be overstated. Scalability and fault tolerance remain the main barriers to the practical application of quantum computers. Achieving a 96% survival rate is a major step forward, bringing us closer to the era of FTQC (Fault-Tolerant Quantum Computing).
Recall that IBM previously announced plans to achieve the first confirmed cases of quantum advantage by the end of 2026. This research shows that the company is moving in the right direction, addressing fundamental problems of decoherence and noise.
Expert Opinion: The breakthrough in error correction is exactly what the industry has been waiting for. 96% is no longer just a laboratory curiosity but a practical indicator that allows serious discussion about creating the first commercially significant quantum systems. If the pace of optimization continues, we may see working prototypes sooner than most analysts predict.