Rydberg atoms with principal quantum number n⪢ 1 have exaggerated atomic properties
including dipole-dipole interactions that scale as n 4 and radiative lifetimes that scale as n 3 …

We review experimental and theoretical tools to excite, study and understand strongly
interacting Rydberg gases. The focus lies on the excitation of dense ultracold atomic …

We report on strong van der Waals blockade in two-photon Rydberg excitation of ultracold
magnetically trapped Rb 87 atoms. The excitation dynamics was investigated for a large …

We analyze the effects of Zeeman degeneracies on the long-range interactions between like
Rydberg atoms, with particular emphasis on applications to quantum-information processing …

Millimeter-wave resonance spectroscopy has been used to measure the (n+ 2) d 5∕ 2 to nf
5∕ 2, 7∕ 2 transition frequencies of cold Rb 85 atoms in a magneto-optical trap. From these …

We discover a transition from extended to localized quasimodes for light in a gas of
immobile two-level atoms in a magnetic field. The transition takes place either upon …

The ac Stark effect was used to induce resonant energy transfer between translationally cold
Rb 85 Rydberg atoms. When a 28.5 GHz dressing field was set at specific field strengths, the …

It is demonstrated that rf current modulation of a frequency stabilized injection-locked diode
laser allows the stabilization of an optical cavity to adjustable lengths, by variation of the rf …

We study the nonequilibrium many-body dynamics of a cold gas of ground-state alkali-metal
atoms weakly admixed by Rydberg states with laser light. On a time scale shorter than the …

The dipole-dipole broadening of ns− np microwave transitions of cold Rb Rydberg atoms in
a magneto-optical trap has been recorded for 28⩽ n⩽ 51. Since the electric dipole transition …