2020 Volume 63 Issue 10 Pages 512-513
In recent years, atomic clocks have been widely recognized as a key technology in global positioning system (GPS) and other sensing systems. State-of-the-art clocks such as optical lattice clocks showed outstanding stability and accuracy, which will possibly be used for the new definition of time in the near future. This special issue introduces recent research topics on laser cooling methods and optical lattice clocks. Evidently, all the contributing articles exhibit some association with our core research fields, that is, surface science and vacuum science. Therefore, we expect that fruitful communications and collaborations will be promoted by these articles, and hopefully a new research area would be discovered.