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This research demonstrates how quantum many-body scars can overcome typical decoherence limits to achieve quadratic-in-time growth in sensing precision for weak alternating current fields. By utilizing non-ergodic dynamics within the PXP model, this approach offers a robust pathway to improved sensor performance without relying on fragile entangled states. The findings establish that structured coherence enables sustained high-fidelity measurements as system size increases.

Surse care acoperăQuantum Zeitgeist, Quantum Frontiers, Latent Space, finanznachrichten.de

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Quantum Systems Harness ‘scars’ for Far More Precise Field Sensing

Quantum Zeitgeist16 iunie 20266 min de cititArticolul și perspectiva sunt în engleză.

Sensing precision now increases with system size, defying the usual limitations of quantum sensing protocols. Quadratic-in-time growth of the quantum Fisher information, achieved through resonant driving of quantum many-body scars in the PXP model, offers sustained performance previously reliant on fragile entangled states. This structured, non-ergodic approach establishes a new avenue for detecting weak alternating current fields.

Matheus Fibger of the Fluminense Federal University (UFF) and colleagues show that these scars, displaying unusual coherent behaviour, enable resonant processes when the driving frequency aligns with the scar gap. This results in a quantum Fisher information that grows quadratically with time, offering a pathway to improved sensing performance. Their analysis of probe operator connectivity reveals that staggered magnetization outperforms homogeneous magnetization in scaling the quantum Fisher information with system size, establishing a method for using non-ergodic dynamics in quantum sensing protocols. A substantial leap forward was demonstrated by the quantum Fisher information (QFI), achieving quadratic-in-time growth, a rate previously unattainable with conventional coherence-based methods. Overcoming limitations imposed by rapid decoherence in many quantum systems, this quadratic scaling…

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