Quantum Breakthrough: Logical Qubit Survival Rate Reaches 96% on IBM Heron Processor
A group of researchers from the University of Sydney, in collaboration with IBM engineers, has achieved significant progress in the field of quantum computing. They managed to increase the survival rate of logical qubits to 96% using an improved error correction mechanism on the 156-qubit superconducting processor IBM Quantum Heron r2.
The key obstacle to creating stable, fault-tolerant quantum systems (FTQC) is the so-called "idle noise." It occurs when the system is forced to pause computations to perform intermediate qubit measurements for error correction. During such pauses, the remaining processor components lose stability, generating new errors and negating correction efforts.
To solve this problem, the physicists completely redesigned the architecture of error correction circuits. The main goal was to radically reduce the computation downtime. Thanks to algorithm optimization, the survival rate of logical qubits per error correction cycle was raised from less than 90% to an impressive 96%.
Stephen Bartlett, project leader and director of Sydney Nano, emphasized that forced idle time of processor components at each stage of computation is a serious obstacle to reliable operation. Although the result was obtained in a laboratory setting on a single processor, this research direction is critically important for the entire industry. Scalability and fault tolerance remain the main barriers to the era of practical quantum computing.
As a reminder, IBM previously announced plans to achieve the first confirmed cases of quantum advantage by the end of 2026. Achieving a 96% survival rate for logical qubits is an important step toward this goal, demonstrating that the "idle noise" problem is solvable. However, for commercial application, it will be necessary not only to maintain this accuracy when scaling the system to thousands of qubits but also to integrate new correction schemes into real computational tasks.