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Ömer Bayraktar

  • Doctoral student
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2026

Composable free-space continuous-variable quantum key distribution using discrete modulation

Kevin Jaksch, Thomas Dirmeier, Yannick Weiser, Stefan Richter, Oemer Bayraktar, Bastian Hacker, Conrad Rösler, Imran Khan, Stefan Petscharning, et al.

Science Advances 12 eadv1440 (2026) | Journal | PDF

Continuous-variable (CV) quantum key distribution (QKD) allows for quantum secure communication with the benefit of being close to classical coherent communication. In recent years, CV QKD protocols using a discrete number of displaced coherent states have been studied intensively as the modulation can be directly implemented with real devices with finite resolution. Until now, experiments only calculated key rates in the asymptotic regime. Here, we present a CV QKD system using discrete modulation that is especially designed for atmospheric channels. We use polarization encoding to exploit the nonbirefringent nature of the turbulent atmosphere. This allows to expand CV QKD networks beyond the existing fiber backbone. In a laboratory demonstration with a static 3-decibel loss channel, we implemented a recently developed security proof allowing to calculate composable finite-size key rates against independently and identically distributed collective attacks. We applied the full QKD protocol including a quantum random number generator, error correction, and privacy amplification to extract secret keys.

Ömer Bayraktar

Born 29.9.1990 in Lünen, Germany

Experimental Physicist in Quantum Optics

Research topics: quantum optics, quantum information processing, integrated photonics, quantum technologies in space

Research experience

  • 2014/03-now Doctoral student at Max Planck Institute for the Science of Light in Erlangen, Germany
  • 01/2015-02/2016 Master student at Royal Institute of Technology in Stockholm, Sweden (group of Gunnar Björk)
  • 08/2014-12/2014 Research intern at Royal Institute of Technology in Stockholm, Sweden (group of Gunnar Björk)
  • 11/2013-06/2014 Student research assistant at Max Planck Institute for Quantum Optics in Garching, Germany (group of Gerhard Rempe)
  • 07/2013-09/2013 Research intern at Centre for Quantum Technologies in Singapore (group of Rainer Dumke)

Education

  • 2014-2016 Master of Science in Engineering Physics, Kungliga Tekniska Högskolan, Sweden; Thesis: "Quantum-polarization state tomography" (with Prof. Gunnar Björk)
  • 2013-2016 Master of Science in Condensed Matter Physics, Technische Universität München, Germany
  • 2010-2013 Bachelor of Science in Physics, Technische Universität Dortmund, Germany; Thesis on exciton-polariton condensates (with Prof. Manfred Bayer)
  • 2010 Abitur (final high school exam) at Gymnasium Lünen-Altlünen, Germany; final grade 1.6

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