Quantum

Probing quasiperiodic spectral accessibility with a finite-rate quantum Otto cycle

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Briefings

A finite-rate quantum Otto cycle acts as a thermodynamic probe for quasiperiodic systems, revealing dynamic spectral accessibility. For a generalised Aubry-André-Harper chain, extended protocols show non-universal work statistics reflecting transition pathways rather than static regimes. Positive mean work can reappear during finite-rate cycles even when population transfer remains nonadiabatic, and a finite-rate window of positive-work cycles exists alongside negative mean work. These findings apply to finite-size systems and are supported by thermal contacts, offering a fluctuation-resolved probe complementary to spectroscopic diagnostics.

Key points

• Finite-rate quantum Otto cycles can probe quasiperiodic systems by revealing dynamically accessible spectral regions.
• Extended protocols on Aubry-André-Harper chains show non-universal work statistics due to transition pathways rather than static regimes.

Context

Quasiperiodic systems combine sharply different spectral and localisation regimes with a dense hierarchy of dynamical time scales, allowing finite-rate cycles to act as thermodynamic probes.

Limitations

Evidence is limited to a generalised Aubry-André-Harper chain; results persist in finite-size analysis but no universal ordering of work fluctuations is confirmed. Preprint status (arXiv:2610.30555v1) and uncertainty regarding microscopic adiabatic recovery remain.

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