IBM and Rutgers Crack Quantum Computer Chaos With a Phase-Transition Trick
Scientists from IBM and Rutgers University have demonstrated that a 156-qubit quantum processor can tame its own internal chaos through repeated measurement-and-reset cycles, identifying a sharp tipping point beyond which the system becomes reliably controllable. The breakthrough is a key step toward fault-tolerant quantum computing.
A research team from Rutgers University, IBM and partner institutions has published a landmark experiment in Nature Physics showing that quantum computers can be pulled from chaotic disorder into stable, controllable order — but only after crossing a precise threshold. Running on an IBM quantum processor carrying 156 qubits, the experiment performed nearly 5,000 entangling operations and an equal number of measurement-and-reset cycles, making it the largest real-time quantum feedback demonstration to date. The team alternated two competing processes: one that scrambled quantum information across qubits (representing chaos) and one that checked and reset individual qubits (representing control). When correction cycles exceeded roughly 50 percent of all steps — a tipping point measured at 0.495 — the system snapped abruptly from chaos to order, much like water freezing into ice. Below that threshold, chaos dominated; above it, the researchers could guide qubits toward the precise state they required. Physicist Jedediah Pixley of Rutgers explained that fault-tolerant quantum computers will need to perform such corrections not once or twice but continuously throughout a calculation. The discovery of a sharp phase transition gives engineers a well-defined target: keep the correction rate above the threshold and the processor stays coherent. The paper appeared in Nature Physics on October 9, 2026, and drew wide coverage as quantum hardware approaches practical viability.
