Jean-Baptiste Trebbia

Publications (2)13.2 Total impact

• Article: Efficient biexciton emission in elongated CdSe/ZnS nanocrystals.

  Y Louyer, L Biadala, J-B Trebbia, M J Fernée, Ph Tamarat, B Lounis
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  ABSTRACT: We use a combination of low-temperature magneto-optical and lifetime spectroscopies to study the band-edge exciton fine structure of highly photostable single CdSe/ZnS nanocrystals (NCs). Neutral NCs displaying multiline emission spectra and multiexponential photoluminescence (PL) decays are studied as a function of temperature and external magnetic fields. Three different fine structure regimes are identified as a function of the NC aspect ratio. In particular, we identify an optically inactive ground exciton state, whose oscillator strength is tuned up under magnetic field coupling to bright exciton states, and attribute it to the zero angular momentum ground exciton state of elongated NCs. We also show evidence for highly efficient biexciton emission in these NCs, with radiative yields approaching unity in some cases.
  Nano Letters 09/2011; 11(10):4370-5. · 13.20 Impact Factor
• Source

  Available from: arxiv.org

  Article: Indistinguishable near infra-red single photons from an individual organic molecule

  Jean-Baptiste Trebbia, Philippe Tamarat, Brahim Lounis
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  ABSTRACT: By using the zero-phonon line emission of an individual organic molecule, we realized a source of indistinguishable single photons in the near infrared. A Hong-Ou-Mandel interference experiment is performed and a two-photon coalescence probability of higher than 50% at 2 K is obtained. The contribution of the temperature-dependent dephasing processes to the two-photon interference contrast is studied. We show that the molecule delivers nearly ideal indistinguishable single photons at the lowest temperatures when the dephasing is nearly lifetime limited. This source is used to generate post-selected polarization-entangled photon pairs, as a test-bench for applications in quantum information.
  11/2010;