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)