• Institutes
• Principal Investigators
  • W. Arendt
  • L. Bogani
  • M. Bossert
  • T. Calarco
  • N. Frühauf
  • A. Groß
  • J. Hecker Denschlag
  • T. Jacob
  • U. Kaiser
  • B. Keimer
  • K. Kern
  • E. Mena-Osteritz
  • P. Michler
  • A. Muramatsu
  • J. v. Slageren
  • K. Urban
  • T. Weil
  • W. Zurek

Prof. Dr. Peter Michler

	Postal Address: Institut für Halbleiteroptik und Funktionelle Grenzflächen Pfaffenwaldring 57 D - 70569 Stuttgart Tel.: +49 (0)7 11 / 685 - 64660 Fax.: +49 (0)7 11 /685 - 63866 Personal Homepage   Research Areas: Area B: Complex Quantum Systems: From Quantum Networks to Quantum Simulators Area C: Light-Matter Interface Area E: Quantum Electrical and Optical Engineering

Research Highlights

		Non-resonant dot-cavity coupling and its potential for resonant single-quantum-dot spectroscopy Non-resonant emitter–cavity coupling is a fascinating effect recently observed as unexpected pronounced cavity resonance emission even in strongly detuned single quantum dot–microcavity systems. This phenomenon indicates strong, complex light–matter interactions in these solid-state systems, and has major implications for single-photon sources and quantum information applications.We study non-resonant dot–cavity coupling of individual quantum dots in micropillars under resonant excitation, revealing a pronounced effect over positive and negative quantum dot mode detunings. Our results suggest a dominant role of phonon-mediated dephasing in dot–cavity coupling, giving a new perspective to the controversial discussions ongoing in the literature. Such enhanced insight is essential for various cavity-based quantum electrodynamic systems using emitters that experience phonon coupling, such as colour centres in diamond and colloidal nanocrystals. Non-resonant coupling is demonstrated to be a versatile "monitoring" tool for observing relevant quantum dot s-shell emission properties and background-free photon statistics. more
		Post-Selected Indistinguishable Photons from the Resonance Fluorescence of a Single Quantum Dot in a Microcavity Applying continuous-wave pure resonant s-shell optical excitation of individual quantum dots in a high-quality micropillar cavity, we demonstrate the generation of post-selected indistinguishable photons in resonance fluorescence. Close to ideal visibility contrast of 90% is verified by polarization-dependent Hong-Ou-Mandel two-photon interference measurements. Furthermore, a strictly resonant continuous wave excitation together with controlling the spontaneous emission lifetime of the single quantum dots via tunable emitter-mode coupling (Purcell) is proven as a versatile scheme to generate close to Fourier transform-limited (T2/(2T1) = 0.91) single photons even at 80% of the emission saturation level. more
		Electrically pumped single-photon emission An electrically pumped single-photon emitter in the visible spectral range, working up to 80 K has been realized using a self-assembled single InP quantum dot embedded in AlGaInP. Aluminum was added to the barrier material in order to provide a higher QD confinement potential. We confirm that the electroluminescense is emitted from a single quantum dot by performing second-order autocorrelation measurements and show that the deviation from perfect single-photon emission is entirely related to detector limitations and background signal. more