Watching Atoms Bang Together

Anonymous

Anonymous

Jacquelyn Ho

Ahmed Omran

Yanhui Wang, Chunlei Jiang, Zhao-Hui Peng +2 more

Bang-bang(BB) decoupling schemes for low-level atom systems in the cases of adiabatic decoherence alone, amplitude decoherence alone, and the case of adiabatic and amplitude decoherence together have been fully discussed. And for arbitrary-level atom system in amplitude decoherence, BB decoupling scheme was also given. Here after a review, we give the BB decoupling scheme for an arbitrary-level atom system in general decoherence.

Peter Wolf

In the opening paragraphs of his 1905 paper introducing special relativity, Einstein defines time as “the position of the small hand of my watch,” with the validity of this definition restricted to the immediate vicinity of the watch. He then goes on to discuss the possibility of conventionally synchronizing distant clocks using the exchange of electromagnetic signals and thus of realizing a network of clocks that can be used to provide space and time information. Such networks of clocks are today a reality, the best known ones being the global satellite navigation systems (GNSS) like GPS or Galileo. These consist of atomic clocks on the ground and onboard satellites, together with the quartz clocks that are inside the everyday GNSS receivers we use in our cars and smartphones. In recent years,