Abstract：
We study electromagnetically induced transparency of a ladder type configuration in ultracold atomic gases, where the upper level is an electronically highly excited Rydberg state. We study a scenario where both dispersive and dissipative long-range interactions between Rydberg atoms are present. This is motivated by recent experimental discovery, where molecular transitions cause an effective two-body dephasing process. It has been shown that long-range van der Waals interactions suppress simultaneous excitations of multiple Rydberg atoms within a blockade volume. We show that the nonlocal, two-body dissipative process enhances the excitation blockade. Through numerical and approximately analytical calculations, we show that transmission of the probe field is reduced drastically in the transparent window, which is accompanied by stronger photon-photon anti-bunching. Around the Autler-Townes splitting, photon bunching is amplified by the two-body dephasing.
Biography：
Dong Yan, Associate professor in Changchun University. He received his BS degree from the department of Physics, Beihua University in 2001, and his PhD degrees from department of Physics, Jilin University in 2013, respectively. His interests include quantum chaos, quantum entanglement, spin squeezing and novel nonlinear properties in Rydberg atoms. He has published about 45 technical journal papers, including 1 in Physical Review E, 7 in Physical Review A, and so on.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai