Anomalous excitation enhancement with Rydberg-dressed atoms

作者:Chai, Xiaoqian; Zhang, Lu; Ma, Dandan; Yan, Luyao; Bao, Huihan; Qian, Jing*
来源:Physical Review A, 2017, 96(5): 053417.
DOI:10.1103/PhysRevA.96.053417

摘要

We develop the research achievement of recent work [Garttner et. al., Phys. Rev. Lett. 113, 233002 (2014)], in which an anomalous excitation enhancement is observed in a three-level Rydberg-atom ensemble with many-body coherence. In our theoretical analysis, this effect is ascribed to the existence of a quasidark state as well as its avoided crossings to nearby Rydberg-dressed states. Moreover, we show that with an appropriate control of the optical detuning to the intermediate state, the enhancement can evoke a direct facilitation to atom-light coupling that even breaks through the conventional root N limit of strong-blockaded ensembles. As a consequence, the intensity of the probe laser for intermediate transition can be reduced considerably, increasing the feasibility of experiments with Rydberg-dressed atoms.