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Cooperative Lamb shift in a mesoscopic atomic array.

Z Meir1, O Schwartz1, E Shahmoon2

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.

Physical Review Letters
|November 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers observed cooperative Lamb shifts in strontium ions, demonstrating long-range quantum interactions. This study explores far-field resonant coupling in mesoscopic atomic arrays, advancing quantum emission research.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum electrodynamics

Background:

  • Quantum electrodynamics predicts energy level shifts in quantum emitters due to virtual photon exchange.
  • Cooperative Lamb shifts are typically studied in the near-field, but resonant interactions extend to the far-field.
  • Far-field interactions enable coherent coupling between distant quantum emitters.

Purpose of the Study:

  • To spectroscopically observe the cooperative Lamb shift in an optical electric-dipole transition.
  • To investigate far-field resonant coupling in mesoscopic atomic arrays.
  • To explore cooperative emission phenomena in extended systems.

Main Methods:

  • Utilizing an array of Strontium-88 (Sr+) ions confined in a Paul trap.
  • Precisely controlling ion positions to create linear chains up to 40 micrometers long.
  • Spectroscopically measuring energy level shifts in the Sr+ ions.

Main Results:

  • Direct observation of the cooperative Lamb shift in Sr+ ions at inter-ion distances significantly larger than the resonance wavelength.
  • Demonstration of far-field resonant coupling in mesoscopic atomic arrays.
  • Successful study of cooperative effects in chains of up to eight ions.

Conclusions:

  • The study confirms the persistence of cooperative Lamb shifts in the far-field regime.
  • This work establishes a novel experimental platform for studying cooperative phenomena in extended atomic systems.
  • The findings open new avenues for exploring quantum interactions in mesoscopic atomic arrays.