Breakthrough in quantum computing: logical qubit survival rate reaches 96% on IBM Heron
A team of researchers from the University of Sydney, in collaboration with IBM engineers, has taken a significant step toward fault-tolerant quantum computing. They managed to increase the survival rate of logical qubits to 96% per error correction cycle. This achievement was realized on the advanced 156-qubit superconducting processor IBM Quantum Heron r2.
The main stumbling block for creating stable quantum machines remains the so-called "idle noise." This effect occurs when the system is forced to perform intermediate measurements of qubits to check and correct errors. During these pauses, the remaining components of the processor lose stability, generating new failures. Essentially, the attempt to fix an error itself creates new problems.
To circumvent this fundamental limitation, physicists completely redesigned the architecture of the correction circuits. They radically reduced the time of forced computation halts. The result is impressive: while previously the survival rate of logical qubits fluctuated below the 90% mark, after optimizing the algorithms, this indicator consistently holds at 96%.
Project leader Stephen Bartlett emphasized that the correction process is repeated multiple times at each stage of computation, and every second of downtime is a serious blow to the reliability of the entire system. Although the experiment was conducted in laboratory conditions on a single processor, this line of research is critically important for the entire industry.
Scalability and fault tolerance remain the main barriers to the era of practical quantum computing. It is worth recalling that IBM previously announced plans to achieve the first confirmed cases of quantum advantage by the end of 2026.
Expert opinion: Achieving 96% survival is not just a number. It is a demonstration that the problem of "idle noise" has a practical solution. If this approach can be scaled to thousands of qubits, we could see a real breakthrough in FTQC (fault-tolerant quantum computing) sooner than the boldest estimates predict. Keep an eye on IBM processors — this Heron could be the "first swallow" of a new era.