Publications

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  1. Design and implementation of a mobile optical ground station for air-to-ground FSOC-Links

    Authors
    P. Krause, M. Rothe, I. Gebhart, M. Goy, C. Waldron, M. Landmann, F. Steinlechner
    Year of publication
    Published in:
    Free-Space Laser Communications XXXVIII : LASE | 17-23 JANUARY 2026: Proceedings
    University Bibliography Jena:
    fsu_mods_00035565External link

  2. Entanglement swapping in high dimensions with only linear optics

    Authors
    B. Baghdasaryan, K. Joarder, F. Steinlechner
    Year of publication
    Published in:
    Optics express
    Entanglement swapping is a fundamental building block for realizing first-generation quantum repeaters, which are essential for building global quantum networks. Current quantum repeater systems still struggle to achieve practical communication rates. High-dimensional (HD) encoding can significantly improve repeater efficiency by boosting information capacity and enhancing noise tolerance and security. However, the experimental demonstration of this protocol so far has been limited only to two-dimensional systems due to the requirement of strong nonlinear interactions. Here, we theoretically show that a modular linear-optics setup can implement HD entanglement swapping based on ancillary photons. For a four-dimensional scenario, we present an experimental design that employs hyper-entanglement in the polarization and time-bin degrees of freedom. This setup resolves the most challenging part of the ancillary photons-based approach, namely the necessary preparation of the ancilla state and the analysis of the resulting swapped state.
    University Bibliography Jena:
    fsu_mods_00038996External link

  3. Integration and control of an LNOI interferometer for photonic quantum computing

    Authors
    E. Beckert, M. Reibe, M. Monika, C. Luna, M. Leyendecker, O. Kohout, M. Nagel, T. Dietrich, M. Babin, D. Mitin, S. Trautmann, R. Geiss, F. Eilenberger, F. Steinlechner
    Year of publication
    Published in:
    Quantum computing, communication, and simulation VI
    University Bibliography Jena:
    fsu_mods_00036536External link

  4. Noise Resilient Real-Time Phase Imaging via Undetected Light

    Authors
    J. León-Torres, P. Hendra, Y. Hadiyal, C. Spiess, F. Steinlechner, F. Setzpfandt, M. Gräfe, V. Gili
    Year of publication
    Published in:
    Advanced quantum technologies
    Quantum imaging with undetected light has recently emerged as a technique in which quantum correlations and nonlinear interferometry are combined to decouple illumination and detection paths. This approach has been more recently extended and combined with digital phase-shifting holography and off-axis holography to extract both the amplitude and phase information of a sample relying on single-photon interference. Despite these advantages, implementing the technique in real-world scenarios where the observed system is subject to environmental noise and dynamic variations remains challenging. The primary limitation lies in the inability of quantum imaging systems to retrieve object information in real time under high-noise conditions. Here, real-time amplitude and phase imaging in noisy environments is experimentally demonstrated, building upon our previous implementation of quantum off-axis holography. Our results demonstrate real-time imaging at acquisition rates up to 4 Hz, even when the noise level exceeds the signal by an order of magnitude.
    University Bibliography Jena:
    fsu_mods_00037791External link

  5. Towards high-dimensional frequency-bin quantum key distribution in a multi-user quantum network

    Authors
    M. Cabrejo-Ponce, F. Steinlechner
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043972External link

  6. Optical Cat State Approximation in a Nonlinear Interferometer-like Photon-Subtraction Setup

    Authors
    J. Conrad, F. Steinlechner, R. Sondenheimer
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043971External link

  7. Symmetric Polarization-Maintaining Fibers for Preserving Polarization and Time-Energy Entanglement for Satellite Quantum Links

    Authors
    U. Chandrashekara, K. Méndez, M. Ponce, C. Luna, F. Steinlechner
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043974External link

  8. Postprocessing Methods for Continuous Wave Four-Fold Hong-Ou-Mandel Interference

    Authors
    S. Häussler, M. Cabrejo-Ponce, A. Torres, K. Lozano-Méndez, B. Baghdasaryan, F. Steinlechner
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043976External link

  9. Real-time quantum phase distillation via undetected light

    Authors
    J. León-Torres, P. Hendra, Y. Hadiyal, C. Spiess, F. Steinlechner, F. Setzpfandt, M. Gräfe, V. Gili
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043977External link

  10. Entanglement-based quantum key distribution with active polarization control in deployed fiber infrastructure

    Authors
    T. Goebel, R. Gomez, S. Naik, P. Paul, P. Ancsin, N. Döll, S. Mishra, N. Tucakovic, J. Dwan, G. Sauer, C. Spiess, F. Steinlechner
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043970External link

  11. Asynchronous Multiphoton Interference for Quantum Networks

    Authors
    B. Baghdasaryan, K. Méndez, M. Leipe, M. Cabrejo-Ponce, K. Joarder, S. Häussler, T. Gühring, S. Fritzsche, T. Goebel, R. Krämer, S. Nolte, C. Luna, Y. Tsujimoto, F. Steinlechner
    Year of publication
    Status
    Review pending
    Published in:
    Quantum 2.0 - Proceedings Quantum 2.0 Conference and Exhibition
    University Bibliography Jena:
    fsu_mods_00043979External link

  12. Ultra-compact payload for a LEO-orbit based entanglement QKD mission using cubesats

    Authors
    E. Beckert, D. Heinig, F. Steinlechner, K. Fuechsel, M. Beier, K. Schilling, A. Kloth
    Year of publication
    Published in:
    Quantum Computing, Communication, and Simulation V
    University Bibliography Jena:
    fsu_mods_00024480External link
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