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Atom–atom interactions around the band edge of a photonic crystal waveguide
Contributed by H. Jeffrey Kimble, June 17, 2016 (sent for review March 7, 2016; reviewed by Eugene Polzik and Dan Stamper-Kurn)

Significance
In recent years, there has been considerable effort to bring ultracold atoms into the realm of nanophotonics. Nanoscopic dielectric devices offer unprecedented opportunities to engineer novel capabilities for the control of atom–photon interactions. In particular, photonic crystals are periodic dielectric structures that display a photonic bandgap where light cannot propagate and provide a new setting for coherent photon-mediated interactions between atoms with tunable range. Here, we report the initial observation of cooperative atom–atom interactions around the band edge of a photonic crystal waveguide. Our experiment opens the door to fascinating scenarios, such as exploring many-body physics with large spin exchange energies and low dissipation.
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
Footnotes
↵1Present address: JILA, University of Colorado, Boulder, CO 80309.
- ↵2To whom correspondence should be addressed. Email: hjkimble{at}caltech.edu.
Author contributions: J.D.H., A.G., S.-P.Y., and H.J.K. designed research; J.D.H., A.G., A.A.-G., M.L., S.-P.Y., D.E.C., and H.J.K. performed research; J.D.H., A.G., A.A.-G.,? S.-P.Y., and D.E.C. contributed new reagents/analytic tools; J.D.H., A.G., A.A.-G., M.L., and S.-P.Y. analyzed data; and J.D.H., A.A.-G., and H.J.K. wrote the paper.
Reviewers: E.P., Copenhagen University; and D.S.-K., University of California, Berkeley.
The authors declare no conflict of interest.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1603788113/-/DCSupplemental.
Freely available online through the PNAS open access option.