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Physical Review A

Quantum-beat echoes

THOMAS H. JEYS, F. B. Dunning, R. F. Stebbings

Published Jan 1, 1984• 12 citations
Publisher

Abstract

An echo has been observed in the fine-structure quantum beats of a coherently excited collection of sodium high-Rydberg-state atoms. This echo may be of value in the study of collisional dephasing of Rydberg-state atoms in much the same way as spin echoes and photon echoes have been used to study relaxation processes in other systems.
DOI
10.1103/physreva.29.379

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New Journal of Physics•Apr 3, 2009•19 citations
The collisional scattering of magnetically polarized atoms is of fundamental interest since the scattering process couples translational and internal degrees of freedom.1 Photon-echo techniques have recently been used to study this coupling by preparing active atoms in a superposition of magnetic sublevels and then quantitatively correlating collisional velocity changes with collisional depolarization.2–5 These experiments provide previously unmeasured information about the collision process. For example, they elucidate the differential relaxation experienced by different types of magnetic order (k-multipoles) and clarify the structure of polarization preserving collision kernels.
Rotary echoes are employed to study excitation dynamics in many-body Rydberg systems. In this method, a phase reversal of a narrow-band excitation field is applied at a variable time during the excitation pulse. The visibility of the resulting echo signal reveals the degree of coherence of the excitation process. Rotary echoes are measured for several n D 5/2 Rydberg levels of rubidium with principal quantum numbers near n =43, where the strength of electrostatic Rydberg-atom interactions is modulated by a Forster resonance. The Rydberg-atom interactions are shown to diminish the echo visibility, in agreement with recent theoretical work. The equivalence of echo signals with spectroscopic data is demonstrated.
Rotary echoes are employed to study excitation dynamics in many-body Rydberg systems. In this method, a phase reversal of a narrow-band excitation field is applied at a variable time during the excitation pulse. The visibility of the resulting echo signal reveals the degree of coherence of the excitation process. Rotary echoes are measured for several nD5/2 Rydberg levels of rubidium with principal quantum numbers near n=43, where the strength of electrostatic Rydberg-atom interactions is modulated by a Forster resonance. The Rydberg-atom interactions are shown to diminish the echo visibility, in agreement with recent theoretical work. The equivalence of echo signals with spectroscopic data is demonstrated.