Centre for Quantum Optical Technologies
QT Lab

Quantum Technologies Laboratory (QT Lab)

Lab Leader: Prof. Konrad Banaszek

Within the QT Lab we develop new concepts for optical communication systems, building on recent advances in quantum information science and quantum optics. The central idea stems from reformulating the communication task as the identification problem for non-orthogonal quantum states describing individual inputs, rather than transmitting information in classical variables, such as the intensity or the phase, whose conventional measurements are bounded by standard quantum limits. This general approach, when implemented using the state-of-the-art methods for optical signal processing and characterization at the quantum level, opens up new ways to attain sub-shot-noise error rates as well as the superadditivity of accessible information through joint detection. The pursuit of these objectives is complemented by the development of realistic models for optical communication channels and the general analysis of resources in communication protocols.

Team

Piotr Novik

PhD student

Mateusz Kucharczyk

PhD Student

Recent publications

  1. A. Mikos-Nuszkiewicz, K. Lukanowski, K. Banaszek, and M. Jarzyna, Deep-Space Optical Communication Receiver Based on Single Photon Coherent Beam Combination, IEEE Photonics J. 18, 7302013 (2026). doi:10.1109/jphot.2026.3726096
  2. M. Kucharczyk, M. Jarzyna, M. Lasota, P. Kolenderski, J. P. Turkiewicz, P. J. Urban, and K. Banaszek, Experimental realization of optical key distribution under strong wiretap eavesdropping, Appl. Opt. 65, 9585 (2026). doi:10.1364/ao.607192
  3. K. Łukanowski, M. Wójcik, S. Olivares, K. Banaszek, and M. Jarzyna, Security of binary-modulated optical key distribution against quantum-enhanced coherent eavesdropping, New J. Phys. 28, 074516 (2026). doi:10.1088/1367-2630/ae8a75
  4. A. Czerwinski, M. Lasota, M. Jarzyna, M. Kucharczyk, M. Jachura, and K. Banaszek, Modeling Optical Key Distribution Over a Satellite-to-Ground Link Under Weak Atmospheric Turbulence, IEEE J. Select. Topics Quantum Electron. 32 (2026). doi:10.1109/jstqe.2025.3597073
  5. A. Mikos-Nuszkiewicz, K. Łukanowski, M. Jarzyna, and K. Banaszek, Coherent Combination of Deep-Space Optical Signals Under Weak Atmospheric Turbulence, in 2025 IEEE International Conference on Space Optical Systems and Applications (ICSOS) (IEEE, 2025). doi:10.1109/icsos66026.2025.11443148