arXiv subjects

Wen-Li Wang

Publications and source records attributed to Wen-Li Wang.

3 recordsLinked to original sources

arXiv2021

Quasi one-dimensional diffuse laser cooling of atoms

We demonstrate experimentally the generation of one-dimensional cold gases of $^{87}$Rb atoms by diffuse laser cooling (DLC). A horizontal slender vacuum glass tube with length of 105~cm and diameter of 2~cm is used in our experiment. The diffuse laser light inside the tube, which is generated by multi-reflection of injected lasers, cools the background vapor atoms. With 250~mW of cooling light and 50~mW of repumping light, an evenly distributed meter-long profile of atom cloud is obtained. We observe a factor 4 improvement on the atomic OD for a typical cooling duration of 170~ms and a sub-Doppler atomic temperature of 25~$μ$k. The maximum number of detected cold atoms remain constant for a free-fall duration of 30~ms. Such samples are ideal for many quantum optical experiments involving electromagnetically induced transparency, electronically highly excited (Rydberg) atoms and quantum precision measurements.

physics.atom-ph↗

arXiv2014

Interacting heavy fermions in a disordered optical lattice

We have theoretically studied the effect of disorder on ultracold alkaline-earth atoms governed by the Kondo lattice model in an optical lattice via simplified double-well model and hybridization mean-field theory. Disorder-induced narrowing and even complete closure of hybridization gap have been predicted and the compressibility of the system has also been investigated for metallic and Kondo insulator phases in the presence of the disordered potential. To make connection to the experimental situation, we have numerically solved the disordered Kondo lattice model with an external harmonic trap and shown both the melting of Kondo insulator plateau and an compressibility anomaly at low-density.

cond-mat.quant-gas↗

arXiv2007

Addressing Components' Evolvement and Execution Behavior to Measure Component-Based Software Reliability

Software reliability is an important quality attrib-ute, often evaluated as either a function of time or of system structures. The goal of this study is to have this metric cover both for component-based software, be-cause its reliability strongly depends on the quality of constituent components and their interactions. To achieve this, we apply a convolution modeling ap-proach, based on components' execution behavior, to integrate their individual reliability evolvement and simultaneously address failure fixes in the time do-main. Modeling at the component level can be more economical to accommodate software evolution, be-cause the reliability metric can be evaluated by reus-ing the quality measures of unaffected components and adapting only to the affected ones to save cost. The adaptation capability also supports the incremental software development processes that constantly add in new components over time. Experiments were con-ducted to discuss the usefulness of this approach.

cs.SE↗