1. Max-Planck-Institut für die Physik des Lichts
  2. Über uns
  3. Mitarbeiter
  4. Ömer Bayraktar

Ömer Bayraktar

  • Doctoral student
  • Room: A 3.434
  • Tel.: +49 9131 7133 148
  • Email

2024

Ad-hoc hybrid-heterogeneous metropolitan-range quantum key distribution network

Matthias Goy, Jan Krause, Oemer Bayraktar, Philippe Ancsin, Florian David, Thomas Dirmeier, Nico Doell, Jansen Dwan, Friederike Fohlmeister, et al.

arXiv 2412.07473 (2024) | Preprint | PDF

This paper presents the development and implementation of a versatile ad-hoc metropolitan-range Quantum Key Distribution (QKD) network. The approach presented integrates various types of physical channels and QKD protocols, and a mix of trusted and untrusted nodes. Unlike conventional QKD networks that predominantly depend on either fiber-based or free-space optical (FSO) links, the testbed presented amalgamates FSO and fiber-based links, thereby overcoming some inherent limitations. Various network deployment strategies have been considered, including permanent infrastructure and provisional ad-hoc links to eradicate coverage gaps. Furthermore, the ability to rapidly establish a network using portable FSO terminals and to investigate diverse link topologies is demonstrated. The study also showcases the successful establishment of a quantum-secured link to a cloud server.

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.

arXiv 2410.12915 (2024) | Preprint | PDF

Continuous-variable (CV) quantum key distribution (QKD) allows for quantum secure communication with the benefit of being close to existing 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 a finite digital resolution. However, the experimental demonstrations until now only calculated key rates in the asymptotic regime. To be used in cryptographic applications, a QKD system has to generate keys with composable security in the finite-size regime. In this paper, we present a CV QKD system using discrete modulation that is especially designed for urban atmospheric channels. For this, we use polarization encoding to cope with the turbulent but non-birefringent atmosphere. This will allow to expand CV QKD networks beyond the existing fiber backbone. In a first laboratory demonstration, we implemented a novel type of security proof allowing to calculate composable finite-size key rates against i.i.d. collective attacks without any Gaussian assumptions. We applied the full QKD protocol including a QRNG, error correction and privacy amplification to extract secret keys. In particular, we studied the impact of frame errors on the actual key generation.

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

Max-Planck-Zentren und -Schulen

© Max Planck Institute for the Science of Light

Datenerfassung

Diese Website verwendet Cookies, um Ihnen die bestmögliche Nutzung unserer Website zu gewährleisten.

Mehr über die genutzten Cookies erfahren
Cookie optin by Olli machts