title: Atom-atom interactions around the band edge of a photonic crystal waveguide.
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 cross-over from propagating fields [Formula: see text] outside the bandgap to localized fields [Formula: see text] 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 by shifting the band edge frequency of the PCW relative to the [Formula: see text] line of atomic cesium for [Formula: see text] atoms trapped along the PCW. Our results are the initial demonstration of this paradigm for coherent atom-atom interactions with low dissipation into the guided mode.
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125;
authors: Jonathan D
authors: JD
authors: Hood
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125;
authors: Akihisa
authors: A
authors: Goban
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125;
authors: Ana
authors: A
authors: Asenjo-Garcia
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125;
authors: Mingwu
authors: M
authors: Lu
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125;
authors: Su-Peng
authors: SP
authors: Yu
authors: Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Barcelona, Spain.
authors: Darrick E
authors: DE
authors: Chang
authors: Norman Bridge Laboratory of Physics MC12-33, California Institute of Technology, Pasadena, CA 91125; Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125; hjkimble@caltech.edu.
authors: H J
authors: HJ
authors: Kimble
keywords: atomic physics; nanophotonics; quantum optics