title: Observation of the stark-tuned Förster resonance between two Rydberg atoms.
abstract: Cold atoms in highly excited Rydberg states are promising candidates to implement quantum logic gates of a quantum computer via long-range dipole-dipole interaction. Two-qubit gates require a controlled interaction of only two close Rydberg atoms. We report on the first spectroscopic observation of the resonant dipole-dipole interaction between two cold rubidium Rydberg atoms confined in a small laser excitation volume. The interaction strength was controlled by fine-tuning of the Rydberg levels into a Förster resonance using the Stark effect. The observed resonance line shapes are in good agreement with numerical Monte Carlo simulations.
authors.affiliation: Institute of Semiconductor Physics, Prospekt Lavrentyeva 13, 630090 Novosibirsk, Russia. ryabtsev@isp.nsc.ru
authors.forename: I I
authors.initials: II
authors.lastname: Ryabtsev
authors.forename: D B
authors.initials: DB
authors.lastname: Tretyakov
authors.forename: I I
authors.initials: II
authors.lastname: Beterov
authors.forename: V M
authors.initials: VM
authors.lastname: Entin