Experiments on quantum coherence with cold atoms

Wojciech Gawlik, Adam M. Wojciechowski

Coherence, or superposition of atomic states drastically modifies optical properties of atomic media, gives rise to a plethora of interference effects in the interaction of light and atoms and finds applications in quantum information and metrology. This paper presents some experiments on quantum coherences with cold atoms and discusses their possible applications.

E. Giacobino, Jean-Michel Courty, Claude Fabre +2 more

Daniel F. Walls

Danfu Liang, Yifu Zhu, Hebin Li

We report the first implementation of optical two-dimensional coherent spectroscopy of cold atoms. The experiment opens a new avenue to study many-body interac-tions and correlations in cold atoms/molecules.

Danfu Liang, Lexter Savio Rodriguez, Haitao Zhou +2 more

We report an experimental demonstration of optical two-dimensional coherent spectroscopy (2DCS) in cold atoms. The experiment integrates a collinear 2DCS setup with a magneto-optical trap (MOT), in which cold rubidium (Rb) atoms are prepared at a temperature of approximately 200 µK and a number density of 10 10 cm −3 . With a sequence of femtosecond laser pulses, we first obtain one-dimensional second- and fourth-order nonlinear signals and then acquire both one-quantum and zero-quantum 2D spectra of cold Rb atoms. The capability of performing optical 2DCS in cold atoms is an important step toward optical 2DCS study of many-body physics in cold atoms and ultimately in atom arrays and trapped ions. Optical 2DCS in cold atoms/molecules can also be a new avenue to probe chemical reaction dynamics in cold molecules.

Adam Wojciechowski