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Researchers report that repeated measurement and classical feedback helped stabilize recurring motion in a 24-qubit quantum system whose dynamics also showed irregular, chaotic behavior. The experiment suggests that regular and chaotic motion can coexist in this particular many-body system; it does not establish how common such patterns are across quantum systems.
What the researchers observed
A team from Zhejiang University and the University of Leeds studied a 24-qubit ladder system selected from a superconducting processor containing more than 100 qubits. They report finding recurrent motion within the system’s dynamics and using feedback to stabilize it. The paths of the regular motion changed as the qubit interactions changed.
The Phys.org report describes the result as evidence that regular and chaotic behavior can coexist in the many-body system they tested. Its description of “islands” of regular motion within a “sea” of chaos is a metaphor for that reported structure, not a claim that the experiment found separate physical objects.
How the hybrid feedback loop worked
The method alternated brief quantum evolution and measurement with classical computation. Measurements informed a classical computer’s search for a relatively simple state matching the observed result. The researchers then prepared that updated state on the processor and repeated the cycle.
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- Prepare and evolve: Prepare a quantum state and let the system evolve briefly.
- Measure: Take simple measurements of individual qubits.
- Update classically: Use the measurements to find a relatively simple state matching the result.
- Repeat: Prepare the updated state on the processor and run another cycle.
According to the report, this iterative feedback shifted the system from irregular motion toward a repeating pattern without the researchers specifying that pattern beforehand. The report does not provide a named statistic or quantified performance result for the method.
How this relates to quantum many-body scars
The work builds on research into quantum many-body scars—unusual behavior in which certain specially prepared states can repeatedly return near their starting configuration. The report cites an earlier study using specially prepared states on a 30-qubit superconducting processor. It describes the newer search method as inspired by ScarFinder, an algorithm for finding recurring motion associated with many-body scars.
Whether the newly reported regular-motion regions are part of a broader landscape that includes previously observed scars, or are distinct from them, remains an open question. Senior author Zlatko Papić framed the issue this way: “Are some previously observed scars special cases within a broader landscape of regular motion, and when are the two phenomena distinct?”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unknown
This is a report about one tested system, not evidence that all quantum systems contain such patterns. The researchers still want to establish which systems support regular-motion regions, what determines their stability, and how the regions change with qubit number and arrangement. The report also leaves open how the observed behavior relates to quantum many-body scars.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThose questions matter because the 24-qubit ladder experiment alone cannot show how broadly the result applies. The report gives no quantified comparison across systems or interaction settings. Papić called the approach “a practical way to explore this landscape experimentally.”
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Sources
- Phys.org / Science X Network, “Scientists uncover recurrent patterns within chaotic quantum behavior,” October 5, 2026.
- Study cited in the report: Hang Dong et al., “Quantum many-body mixed phase space revealed by hybrid feedback control,” Nature Physics (2026), DOI 10.1038/s41567-026-03431-z.
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