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Volume 646 Issue 8086, 23 October 2025

Controlled chaos

Probing and disentangling the dynamics of many interacting quantum elements, such as those in complex molecules, poses a formidable challenge. In such strongly interacting systems, information scrambles so quickly that isolating the contribution of any single element is nearly impossible. One way to try to overcome this takes inspiration from chaos theory, in which the flap of a butterfly’s wing can cause a tornado. In a similar way, a small disturbance is introduced into the quantum system, which, once unwanted signals have been filtered out, allows localized measurements to track the propagation of the wider disturbance created over time. This approach can provide rich, system-wide information about interactions between the individual elements but it is also extremely fragile and challenging to measure. In this week’s issue, Hartmut Neven and colleagues measure such a disturbance in a superconducting quantum processor. The researchers used an echo technique that, by propagating and refocusing the quantum disturbance twice, created an interference pattern that suppressed unwanted signals and allowed them to extract information about specific interactions within the system. This suggests that the echoing at the heart of these interferometric techniques could become a powerful diagnostic tool for untangling complex quantum dynamics, such as those in intricate molecular systems.

Cover image: SayoStudio for Google Quantum AI.

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