🔬 physics

Finite-copy optimal cloning of mixed qudit states:\\ exact optima, a closed-form cloner, and the structure of covariant sector channels

This paper resolves the long-standing problem of finite-copy optimal cloning for mixed qudit states by formulating it as a concave program over Young-label transitions, providing exact numerical optima, demonstrating that asymptotic cloners can suffer significant fidelity losses, and introducing a closed-form "Knothe–Rosenblatt" cloner that achieves near-optimal performance without semidefinite programming.

Hikaru Wakaura2026-10-26
🔬 physics

Experimental and Computational Investigation of Thermal Conductivity in Porous Silicon: Doping-Dependent Performance of Molecular Dynamics and Physics- Informed Neural Networks

This study presents a hybrid multiscale framework combining experimental photoacoustic measurements, molecular dynamics simulations, and physics-informed neural networks to characterize the doping-dependent thermal conductivity of porous silicon and derive a generalized analytical model linking nanoscale phonon mechanics to macroscopic heat transport properties.

Pavlo Lishchuk, Lesia Chepela, Victoria Shevchenko, Mykola Borovoy, Vasyl Kuryliuk, Oleg Olikh2026-10-23
🔬 physics

High-Accuracy Prediction of Complex Permittivity in Ternary Composites Using Parameters Provided by Binary Systems

This study demonstrates that a binary-informed Maxwell–Garnett mixing-law framework, utilizing fixed effective constituent parameters derived from binary PANI/PU and PANI/paraffin systems, enables high-accuracy, calibration-free prediction of the complex permittivity for ternary PANI/CIP/PU composites across the 2–18 GHz frequency range.

Jia Li, Zihan Yang, Qiqi Li, Xiaoji Liu, Hao Wei, Qiang Wang, Lin Wang, Teng Ma2026-10-23
🔬 physics

High Sensitivity Hemoglobin Biosensing Using a Plus Shaped Gold Metasurface Refractive Index Sensor

This paper proposes a high-sensitivity, label-free hemoglobin biosensor utilizing a reconfigurable plus-shaped gold metasurface integrated with a Germanium Antimony Tellurium (GST) layer, which achieves a maximum sensitivity of 766.67 nm/RIU in its crystalline state, surpassing existing metasurface-based sensors and offering a compact alternative to bulky laboratory infrastructure for clinical diagnosis.

Syed Musthafa, Faizal Mukthar Hussain, Ahamed Hussain Asif, AmanullaKhan Mahaboob Khan2026-10-23
🔬 physics

Intrinsic Vectorial Gradiometry via Quantum Control of a Spin-based Sensor

This paper introduces a quantum control protocol for a single spin-based sensor that enables intrinsic vectorial gradiometry to overcome the limitations of traditional multi-sensor architectures, demonstrating high-precision differential sensing for applications like magnetic anomaly detection and neuronal action potential monitoring.

Jaime García Oliván, Pablo Acedo, Oliver T. Whaites, Jorge Casanova2026-10-23
🔬 physics

Transient Energy Exchange and Quantum Resources in a Driven Five-Level Kerr Optomechanical Model

This study presents a finite-time analysis of a driven five-level atom coupled to a Kerr nonlinear optical mode and a mechanical oscillator, revealing that while stronger atom-field coupling enhances entanglement, it does not preserve phase sensitivity, and that energy exchange metrics like ergotropy and signed work respond distinctively to system parameters without constituting a completed thermodynamic cycle.

SYED ANWAR, M. Ibrahim Ibrahim, S. Abdul Khalik Khalik2026-10-23