Quantum Breakthrough: Logical Qubit Survival Rate Reaches 96% on IBM Heron Processor
A team of researchers from the University of Sydney, together with engineers from IBM, has taken a significant step toward creating fault-tolerant quantum computers. They managed to increase the preservation of logical qubits to 96% per error correction cycle on the latest 156-qubit IBM Quantum Heron r2 processor. This is a serious improvement over previous results, which fell short of 90%.
The main problem hindering the development of quantum systems is the so-called "idle noise." It occurs at moments when the system is forced to pause computations to perform intermediate measurements of qubits. During these pauses, the remaining processor components lose stability, which provokes new errors and negates correction efforts.
Rethinking Error Correction Architecture
To overcome this barrier, physicists completely redesigned the architecture of correction schemes, radically reducing the time of forced stops. Thanks to algorithm optimization on the advanced superconducting IBM processor, the survival rate of logical qubits was raised from less than 90% to 96%. Project leader and Sydney Nano director Stephen Bartlett emphasized that this process is repeated multiple times at each stage of computation, and idle time becomes a "serious obstacle" to reliable operation.
Although the result was obtained in laboratory conditions on a single processor, this research direction is critically important for the entire industry. Scalability and fault tolerance remain the main barriers to the practical application of quantum computers. IBM previously announced plans to achieve the first confirmed cases of quantum advantage by the end of 2026, and such successes in error correction bring that moment closer.
My expert opinion: Increasing qubit survival from 90% to 96% is not just a number. It is a demonstration that engineering solutions can overcome fundamental physical limitations. If this approach scales to thousands of qubits, we may witness the beginning of a true era of practical quantum computing sooner than many predict.