Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.243602
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Funding
- European Research Council (CoG NanoQuaNt)
- Austrian Science Fund (FWF) [W1210-N16, P31115]
- Austrian Science Fund (FWF) [P31115] Funding Source: Austrian Science Fund (FWF)
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We report on the observation of collective superstrong coupling of a small ensemble of atoms interacting with the field of a 30-m long fiber resonator containing a nanofiber section. The collective light-matter coupling strength exceeds the free-spectral range and the atoms couple to consecutive longitudinal resonator modes. The measured transmission spectra of the coupled atom-resonator system provide evidence of this regime, realized with a few hundred atoms with an intrinsic single-atom cooperativity of 0.13. These results arc the starting point for studies in a new setting of light-matter interaction, with strong quantum nonlinearities and a new type of dynamics.
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