Ultra-Strong Coupling in Cavity Quantum Electrodynamics: From Single to Multiple Emitters

• Applicant: Professor Dr. Michael J. Hartmann
• Subject Area: Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas ; Theoretical Condensed Matter Physics
• Term: from 2013 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 240626219

• Final Report Year: 2016

Final Report Abstract

In this project and related work, an abrupt and synchronized transition from a quantum to the classical regime was found for a driven waveguide that is ultra-strongly coupled to multiple emitters. Furthermore we were able to calculate correlations of the signal mode in an optical parametric oscillator at threshold with a novel degree of precision using the self-consisten Mori projector approach we had developed previously. Finally we explored the potential of strong electro-nano-mechanical three-body interaction for the generation of non-classical states of the mechanical motion.

Publications

• Quantum State Engineering with Circuit Electromechanical Three-Body Interactions. Phys. Rev. Lett. 114, 173602 (2015)
  M. Abdi, M. Pernpeintner, R. Gross, H. Hübl, and M. J. Hartmann
  (See online at https://doi.org/10.1103/PhysRevLett.114.173602)
• Self-Consistent Projection Operator Theory in Nonlinear Quantum Optical Systems: A case study on Degenerate Optical Parametric Oscillators. Phys. Rev. A 91, 053850 (2015)
  P. Degenfeld-Schonburg, C. Navarrete-Benlloch, and M. J. Hartmann
  (See online at https://doi.org/10.1103/PhysRevA.91.053850)