aiqbench analysis
This research demonstrates that discrete time-crystalline phases with power-law-graded Ising interactions can serve as robust platforms for quantum energy storage and enhanced sensing, surpassing the Heisenberg limit in metrological precision. While the total stored energy scales superlinearly with system size, the analysis notes that no scaling advantage exists in normalized power, suggesting a need to balance capacity with efficiency metrics. The tunability of quantum advantage via interaction exponents offers a practical pathway for optimizing these systems for specific quantum battery or sensor applications.
Power-law-graded Ising Interactions Stabilize Time Crystals Realizing Quantum Energy Storage and Sensing
arXiv:2508.14847v3 Announce Type: replace Abstract: We study discrete time-crystalline (DTC) phases in one-dimensional spin-1/2 chains with power-law-graded Ising interactions under periodic Floquet driving. By generalizing Stark localization to power-law-graded Ising interaction profiles, we identify robust period-doubled dynamics across a wide range of interaction exponents, stabilized by the interplay between coherent driving and spatially varying coupling. Within the DTC phase, the energy stored in the system, interpreted as a quantum battery, increases superlinearly with system size, although no scaling advantage persists in normalized power. Beyond energy storage, we demonstrate that the DTC phase supports enhanced quantum sensing. The quantum Fisher information associated with estimating timing deviations in the drive scales superextensively with system size, surpassing the Heisenberg limit. The degree of quantum advantage can be tuned by varying the interaction exponent, though DTC behavior remains robust throughout. Our results position power-law-graded Ising interacting Floquet systems as robust platforms for storing quantum energy and achieving metrological enhancement.
Abstract:We study discrete time-crystalline (DTC) phases in one-dimensional spin-1/2 chains with power-law-graded Ising interactions under periodic Floquet driving. By generalizing Stark localization to power-law-graded Ising interaction profiles, we identify robust period-doubled dynamics across a wide range of interaction exponents, stabilized by the interplay between coherent driving and spatially varying coupling. Within the DTC phase, the energy stored in the system, interpreted as a quantum battery, increases superlinearly with system size, although no scaling advantage persists in normalized power. Beyond energy storage, we demonstrate that the DTC phase supports enhanced quantum sensing. The quantum Fisher information associated with estimating timing deviations in the drive scales superextensively with system size, surpassing the Heisenberg limit. The degree of quantum advantage can be tuned by varying the interaction exponent, though DTC behavior remains robust throughout. Our results position power-law-graded Ising interacting Floquet systems as robust platforms for storing quantum energy and achieving metrological enhancement.
Quantum Physics (quant-ph); Other Condensed Matter (cond-mat.other)
arXiv:2508.14847 [quant-ph]
(or arXiv:2508.14847v3 [quant-ph] for this version)
Full text under the publisher's open licence · 165 words
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