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Nano-optics with single photons
  KTH Applied Physics seminars

Thursday 15 September 2011
from 09:15 to 10:00
at FA32
Speaker : Val Zwiller (Kavli Institute of Nanoscience, TU Delft)
Abstract : We have tuned the emission from a single quantum dot to resonance with a rubidium vapor. Using the quantum dot as a source of single photons on demand and the rubidium vapor as a slow light medium, we demonstrated slow non classical light [1]. The complementarity of quantum dots and atomic vapors offers an exciting playground for quantum optics that we'll discuss. Quantum dots in nanowires also offer exciting new perspectives for quantum optics, we will discuss our work on the development of a quantum LED, where single electrons are coherently converted into single photons, mapping the electron spin onto the photon's polarization. In addition, the nanowire geometry enables very high light extraction efficiencies, another crucial element for a quantum repeater. Another novel application of nanoscience to optics are superconducting single photon detectors where single photon detection with high efficiency, low noise and high time resolution is made possible with superconducting nanowires. We will discuss the various schemes that have enabled increasing the detection efficiency to 35 % so far and will mention the road ahead, including on-chip detection of single plasmons, enabling quantum plasmonics experiments [3]. [1] Hybrid semiconductor-atomic interface: slowing down single photons from a quantum dot Akopian N., Wang L., Rastelli A., Schmidt O. G., Zwiller V. Nature Photonics 230, 5 (2011) [2] Low noise superconducting single photon detectors on silicon Dorenbos S. N., Reiger E. M., Perinetti U., Zwiller V., Zijlstra T., Klapwijk T. M. Applied Physics Letters 131101, 93 (2008) [3] On-chip single plasmon detection Heeres R. W., Dorenbos S. N., Koene B., Solomon G. S., Kouwenhoven L. P., Zwiller V. Nanoletters 661, 10 (2009)

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