TY - JOUR T1 - Optimization of photon storage fidelity in ordered atomic arrays JF - New Journal of Physics Y1 - 2018 A1 - M. T. Manzoni A1 - M. Moreno-Cardoner A1 - A. Asenjo-Garcia A1 - J. V. Porto A1 - Alexey V. Gorshkov A1 - D. E. Chang AB -

A major application for atomic ensembles consists of a quantum memory for light, in which an optical state can be reversibly converted to a collective atomic excitation on demand. There exists a well-known fundamental bound on the storage error, when the ensemble is describable by a continuous medium governed by the Maxwell-Bloch equations. The validity of this model can break down, however, in systems such as dense, ordered atomic arrays, where strong interference in emission can give rise to phenomena such as subradiance and "selective" radiance. Here, we develop a general formalism that finds the maximum storage efficiency for a collection of atoms with discrete, known positions, and a given spatial mode in which an optical field is sent. As an example, we apply this technique to study a finite two-dimensional square array of atoms. We show that such a system enables a storage error that scales with atom number Na like ∼(logNa)2/N2a, and that, remarkably, an array of just 4×4 atoms in principle allows for an efficiency comparable to a disordered ensemble with optical depth of around 600.

VL - 20 UR - https://arxiv.org/abs/1710.06312 CP - 083048 U5 - https://doi.org/10.1088/1367-2630/aadb74 ER - TY - JOUR T1 - Single-photon nonlinear optics with graphene plasmons JF - Physical Review Letters Y1 - 2013 A1 - Michael Gullans A1 - D. E. Chang A1 - F. H. L. Koppens A1 - F. J. GarcĂ­a de Abajo A1 - M. D. Lukin AB - We show that it is possible to realize significant nonlinear optical interactions at the few photon level in graphene nanostructures. Our approach takes advantage of the electric field enhancement associated with the strong confinement of graphene plasmons and the large intrinsic nonlinearity of graphene. Such a system could provide a powerful platform for quantum nonlinear optical control of light. As an example, we consider an integrated optical device that exploits this large nonlinearity to realize a single photon switch. VL - 111 UR - http://arxiv.org/abs/1309.2651v3 CP - 24 J1 - Phys. Rev. Lett. U5 - 10.1103/PhysRevLett.111.247401 ER - TY - JOUR T1 - Nanoplasmonic Lattices for Ultracold atoms JF - Physical Review Letters Y1 - 2012 A1 - Michael Gullans A1 - T. Tiecke A1 - D. E. Chang A1 - J. Feist A1 - J. D. Thompson A1 - J. I. Cirac A1 - P. Zoller A1 - M. D. Lukin AB - We propose to use sub-wavelength confinement of light associated with the near field of plasmonic systems to create nanoscale optical lattices for ultracold atoms. Our approach combines the unique coherence properties of isolated atoms with the sub-wavelength manipulation and strong light-matter interaction associated with nano-plasmonic systems. It allows one to considerably increase the energy scales in the realization of Hubbard models and to engineer effective long-range interactions in coherent and dissipative many-body dynamics. Realistic imperfections and potential applications are discussed. VL - 109 UR - http://arxiv.org/abs/1208.6293v3 CP - 23 J1 - Phys. Rev. Lett. U5 - 10.1103/PhysRevLett.109.235309 ER -