arXiv subjects

J. -H. Liang

Publications and source records attributed to J. -H. Liang.

2 recordsLinked to original sources

arXiv2026

Photo-ionization Compensation of Stray Electric Fields for Cold Rydberg Atoms

Neurtal atoms in optical tweezer arrays constitute a highly promising platform for quantum computing and quantum simulation. Their operation relies on precise control of the Rydberg excitation, which is highly sensitive to background electric fields. Here, we identify a previously overlooked source of stray electric fields arising from trapped charges within the antireflection coating layers of glass vacuum cells. In contrast to the conventional approach of removing surface charges through ultraviolet-light-induced desorption, we compensate these clamped charges by generating additional charges via photo-ionization of a cold atomic ensemble. We verify the resulting suppression of stray electric fields through Rydberg excitation spectroscopy in an atomic array and further confirm that the residual electric field inside the vacuum cell is effectively eradicated with the aid of external electrodes. Our work identifies and mitigates a previously unrecognized source of residual electric field, providing a practical solution for improving the performance of neutral atomic quantum processors and other Rydberg-based quantum technologies, as well as surface-sensitive atomic systems.

physics.atom-ph↗

arXiv2025

First-principles analysis of the warm dense plasma jets in Double-Cone Ignition experiments

Double-Cone Ignition (DCI) differs from the traditional laser-driven inertial confinement fusions by relying on gold cones for transverse filtering to achieve warm dense plasma, thereby reducing the energy required during the compression process. Thus, the state of the plasma ejected from the gold cones directly reflects the energy conversion efficiency and influences the subsequent fusion process. In this paper, we analyze the x-ray Thomson scattering data from the earlier stage DCI experiments \cite{zhang2020double}. We combine the imaginary-time correlation function method with first-principles methods to decouple the diagnosis of temperature and density and obtain the temperature and density diagnostic outputs: $25$ $\mathrm{eV}$ and $8\pm2$ $\mathrm{g/cc}$. In the analysis, we consider the effect of multi-element mixing and determine the gold impurity ratio to be $0.162 \pm 0.015 \%$ based on the experimental spectrum. These detailed analysis results demonstrate the role of the gold cone in achieving plasma compression and confirm that the gold impurities are within an acceptable range, providing valuable references for future experiments.

physics.plasm-ph↗