Atom-atom interactions around the band edge of a photonic crystal waveguide

2016/03/31 by J. D. Hood, A. Goban, A. Asenjo-Garcia +4 · 1 citation
Physics and Astronomy · #quant-ph #physics.atom-ph #physics.optics

paper · pdf · doi:10.1073/pnas.1603788113

published as PNAS 113, 10507-10512 (2016)

arxiv created 2017/08/30 · arxiv updated 2017/09/01

Abstract

Tailoring the interactions between quantum emitters and single photons constitutes one of the cornerstones of quantum optics. Coupling a quantum emitter to the band edge of a photonic crystal waveguide (PCW) provides a unique platform for tuning these interactions. In particular, the crossover from propagating fields E(x) ∝ e^{± ik_x x} outside the bandgap to localized fields E(x) ∝ e^{-κ_x |x|} within the bandgap should be accompanied by a transition from largely dissipative atom-atom interactions to a regime where dispersive atom-atom interactions are dominant. Here, we experimentally observe this transition for the first time by shifting the band edge frequency of the PCW relative to the \rm D₁ line of atomic cesium for N=3.0± 0.5 atoms trapped along the PCW. Our results are the initial demonstration of this new paradigm for coherent atom-atom interactions with low dissipation into the guided mode.

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