报告时间：11月2日 周四 下午3:00
报告题目： Toward high-fidelity electric dipole geometric quantum gates
Geometric phases are routinely controlled in modern AMO labs for applications ranging from robust quantum control to creating synthetic gauge fields. In optical domain, the control of geometric phases is challenged by the short coherence times of strong optical transitions due to spontaneous emissions. In this talk I will discuss experimental progresses on control of geometric phases of E1 transitions, in particular, we demonstrate imprinting of geometric phase to laser-cooled atoms using counter-propagating and shaped nanosecond pulses, leading to matterwave acceleration an order of magnitude higher than those due to resonant radiation pressure. We also demonstrate nanosecond geometric pi/2 gates and Ramsey interference probed by atom acceleration. Finally I will briefly discuss the observation of topological frequency conversion when the atoms are driven by quasi-periodic control fields following a recent theoretical proposal .
 Ivar Martin, Gil Refael, and Bertrand Halperin, Topological frequency conversion in strongly driven quantum systems, arXiv:1612.02143.