Breakthrough in quantum computing: logical qubit survival rate reaches 96% on IBM Heron processor
Quantum computing is on the verge of a new era, and the key obstacle on this path remains the instability of qubits. However, recent research demonstrates that this barrier can be overcome. A team of physicists working closely with IBM engineers has achieved an impressive result: the survival rate of logical qubits over one error correction cycle has been increased to 96%. This is a significant leap from previous figures, which rarely exceeded 90%.
The Problem of "Idle Noise"
The main enemy of stable quantum computing is the so-called "idle noise." It occurs when the system pauses its main computations to perform intermediate measurements necessary for error correction. During these pauses, the remaining qubits lose their coherence, leading to new errors. Essentially, an attempt to fix one error generates several new ones.
New Architecture of Correction Circuits
To solve this problem, the researchers completely redesigned the architecture of error correction circuits. Instead of fighting the consequences, they attacked the cause — radically reducing the time of forced stops. The new method was tested on the advanced 156-qubit superconducting processor IBM Quantum Heron r2. Algorithm optimization allowed not just increasing the survival rate, but doing so qualitatively — from less than 90% to 96%.
Steven Bartlett, the project lead, rightly notes that the correction process is repeated multiple times at each stage of computation. Every second of downtime accumulates, turning into a "serious obstacle" for reliable operation. This is why reducing pause time has become a critically important step.
From Lab to Reality
Of course, this result has so far been obtained in laboratory conditions on a single processor. But the direction is correct. Scalability and fault tolerance are the two pillars on which the future of the quantum industry will be built. Without solving the "idle noise" problem, the transition to practical, commercially viable quantum computers will remain an unattainable dream.
Analytical Commentary: Increasing qubit survival to 96% is not just a number. It is a demonstration that the path to fault-tolerant quantum computing (FTQC) exists, and it does not require creating fundamentally new materials. IBM, aiming to achieve quantum advantage by the end of 2026, is clearly betting on such engineering solutions. If the pace of progress continues, we may see the first practical applications of quantum machines in cryptography and materials science much sooner than expected.