Cooperative lamb shift in a mesoscopic atomic array

Z. Meir, O. Schwartz, E. Shahmoon, D. Oron, R. Ozeri

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Abstract

According to quantum electrodynamics, the exchange of virtual photons in a system of identical quantum emitters causes a shift of its energy levels. Such shifts, known as cooperative Lamb shifts, have been studied mostly in the near-field regime. However, the resonant electromagnetic interaction persists also at large distances, providing coherent coupling between distant atoms. Here, we report a direct spectroscopic observation of the cooperative Lamb shift of an optical electric-dipole transition in an array of Sr+ ions suspended in a Paul trap at inter-ion separations much larger than the resonance wavelength. By controlling the precise positions of the ions, we studied the far-field resonant coupling in chains of up to eight ions, extending to a length of 40μm. This method provides a novel tool for experimental exploration of cooperative emission phenomena in extended mesoscopic atomic arrays.

Original languageEnglish
Article number193002
JournalPhysical review letters
Volume113
Issue number19
DOIs
Publication statusPublished - Nov 5 2014

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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