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Entropy, Volume 27, Issue 12

December 2025 - 85 articles

Cover Story: Quantum technologies across platforms, from trapped ions to superconducting circuits, confront a shared challenge: electric field noise originating at material surfaces limits coherence and restricts scalability in size and dimension. In trapped-ion systems, this surface-induced noise manifests as anomalous heating that degrades motional control. We demonstrate that in situ argon-ion treatment of multi-material surface electrodes produces competing, non-monotonic effects: initial cleaning improves field stability while increasing heating, whereas continued exposure reverses both trends, defining narrow operational windows set by surface morphology and redeposition dynamics. These results define actionable strategies for systematic surface engineering, underscoring materials–physics collaboration as a prerequisite for extendable quantum technologies. View this paper
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Articles (85)

  • Article
  • Open Access
210 Views
44 Pages

The Capacity Gains of Gaussian Channels with Unstable Versus Stable Autoregressive Noise

  • Charalambos D. Charalambous,
  • Christos Kourtellaris,
  • Stelios Louka and
  • Sergey Loyka

18 December 2025

In this paper, we consider Cover’s and Pombra’s formulation of feedback capacity of additive Gaussian noise (AGN) channels, with jointly Gaussian nonstationary and nonergodic noise. We derive closed-form feedback capacity formulas, using...

  • Article
  • Open Access
337 Views
31 Pages

18 December 2025

Detecting low-altitude, slow-speed, small (LSS) UAVs is especially challenging in low-visibility scenes (low light, haze, motion blur), where inherent uncertainties in sensor data and object appearance dominate. We propose GAME-YOLO, a novel detector...

  • Article
  • Open Access
142 Views
15 Pages

Transfer Irreversibilities in the Lenoir Cycle: FTT Design Criteria with εNTU

  • Ricardo T. Páez-Hernández,
  • Juan Carlos Pacheco-Paez,
  • Juan Carlos Chimal-Eguía,
  • Delfino Ladino-Luna and
  • Javier Contreras-Sánchez

18 December 2025

This work extends the steady flow Lenoir cycle within finite-time thermodynamics (FTT) by incorporating heat transfer irreversibilities through the ε−NTU formalism and a non-isentropic expansion modeled via the expander isentropic effic...

  • Article
  • Open Access
190 Views
27 Pages

16 December 2025

The accurate extraction of damage information around airport runways is crucial for the rapid development of subsequent damage effect assessment work and the timely formulation of the ensuing operational plan. However, the presence of dark interferen...

  • Article
  • Open Access
203 Views
12 Pages

15 December 2025

The spin-one Ising model on the honeycomb lattice has never been solved exactly in spite of its simplicity. Even its exact critical temperature is not known. The exact integer values for the density of states of the spin-one Ising model on the L&time...

  • Perspective
  • Open Access
335 Views
25 Pages

15 December 2025

Classical thermodynamics (CT) has become integrated into everyday life, especially through its applications in engineering. In contrast, out-of-equilibrium thermodynamics (OET) is often viewed as a fundamental science that seems distant from daily ex...

  • Article
  • Open Access
218 Views
18 Pages

Construction of Space-Filling Asymmetrical Marginally Coupled Designs

  • Weiping Zhou,
  • Miaomiao Meng,
  • Min Li and
  • Xue Yang

13 December 2025

Marginally coupled designs (MCDs) are very suitable for computer experiments with both qualitative and quantitative factors. An MCD consisting of two subdesigns—one for the qualitative factors and the other for the quantitative factors—is...

  • Article
  • Open Access
314 Views
11 Pages

13 December 2025

The dynamics of systems near tipping points attract considerable attention in the context of climate change, ecological regime shifts, disease spreading, and other complex systems undergoing transitions. In particular, the duration and cause of trans...

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Entropy - ISSN 1099-4300