Time-domain Ramsey interferometry with interacting Rydberg atoms
  We theoretically investigate the dynamics of a gas of strongly interacting Rydberg atoms subject to a time-domain Ramsey interferometry protocol. The many-body dynamics is governed by an Ising-type Hamiltonian with long range interactions of tunable strength. We analyze and model the contrast degradation and phase accumulation of the Ramsey signal and identify scaling laws for varying interrogation times, ensemble densities, and ensemble dimensionalities. 
Christian Sommer, Guido Pupillo, Nobuyuki Takei, Shuntaro Takeda,   Akira Tanaka, Kenji Ohmori, Claudiu Genes
cond-mat.quant-gas physics.atom-ph quant-ph