Towards deterministic nanoscale light-matter quantum interfaces with defect centers in diamond (Dr. M. Weber) / Nanophotonics for quantum information and simulation (Dr. A. González Tudela)

  • Double Feature!
  • Date: Jan 20, 2015
  • Time: 02:30 PM - 04:00 PM (Local Time Germany)
  • Speaker: Dr. Markus Weber, MPQ, Abt. Laserspektroskopie / Dr. A. González Tudela, MPQ, Abt. Theorie
  • Room: Herbert Walther Lecture Hall
  • Host: MPQ

Towards deterministic nanoscale light-matter quantum interfaces with defect centers in diamond (Dr. M. Weber)
The efficient coupling of single solid state quantum emitters to a strongly confined mode of an optical waveguide is an important prerequisite for future applications in applied physical and quantum information science. For defect centers hosted in diamond nano-crystals, nanoscale waveguide structures like tapered optical fibers or integrated slot waveguides are particularly attractive platforms promising light-matter coupling efficiencies of up to 36%, respectively 94%. In my talk I will report on recent progress towards the deterministic coupling of a single defect center to the strongly confined mode of a 1D waveguide using an in-situ AFM nano-manipulation technique. For a tapered optical fiber with sub-wavelength diameter waist and a single NV-center we find an experimental coupling efficiency of 10%. In the second part of my talk I will focus on the nano-fabrication of new tailored on-chip slot waveguides. Due to their high light-matter coupling efficiency of close to unity, these waveguides hold promise to perform, e.g., deterministic optical quantum gates on a chip.

Nanophotonics for quantum information and simulation (Dr. A. González Tudela)
Nanophotonics is the field that studies and exploits how to engineer light at the nanoscale. Among  different platforms periodically patterned dielectric materials, the so-called Photonics Crystals (PhCs), appear as one of the most promising ones. Through the engineering of PhCs, it is possible to control and mold light at subwavelength scales and confine to effectively two, one and 0-dimensional systems [1]. Recently, their integration with cold atoms has been experimentally achieved [2]. In this talk, we show how to exploit the characteristics of this hybrid system (atom-nanophotonics). First, we show how to use PhCs waveguides to build high-density optical lattices for ultra cold atoms yielding larger energy scales in the simulation of Bose-Hubbard and spin models. Furthermore, we show how PhCs also provide a very versatile way of mediating large and long-range interactions which can be conservative or dissipative, depending on whether the atomic transition lies within the band-gap or not [3] and explore the physics than emerges from them in two and one-dimensional structures.

References:
[1] J. D. Joannopoulos, S. G. Johnson, J. N. Winn, and R. D. Meade, Photonic crystals: molding the ow of light (Princeton university press, 2011).
[2] A. Goban  et al,.Nat. Commun. 5, 3808 (2014)., J. D. Thompson et al , Science 340, 1202 (2013), T. Tiecke, et al, Nature 508, 241 (2014).
[3] A. González-Tudela,  et al,. arXiv:1407.7336 (2014)



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