P4 - Quantum Key Hubs

P4 – Quantum Key Hubs

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The security of Quantum Key Distribution (QKD) is based on laws of nature. The overall goal of this project is to develop a photon-based QKD structure in a star like topology and to comprehensively explore its fundamental quantum features. The individual goals are to implement wavelength-division multiplexing in a QKD structure including a field test in a real telecom network, to determine the multipartite statistical correlations of the realized QKD structure, and to investigate the scalability of the QKD structure beyond four parties.


Erik Fitzke
Laser und Quantenoptik

Research Interests:

  • Quantum optics
  • Optical Communication
  • Quantum key distribution

Thorsten Haase
Theoretical Quantum Physics

Research Interests:

  • Quantum optics
  • Quantum communication
  • Theory of laser cooling

Oleg Nikiforov
Laser und Quantenoptik

Research Interests:

  • Quantum key distribution experiments
  • Single photon sources
  • Optical communication

Alexander Sauer
Theoretical Quantum Physics

Research Interests:

  • Quantum key distribution protocols
  • Probability polytopes
  • Quantum correlations


Sauer, Alexander ; Alber, Gernot (2020):
Quantum Bounds on Detector Efficiencies for Violating Bell Inequalities Using Semidefinite Programming.
4, In: Cryptography, 2020, (1), MDPI, DOI: 10.3390/cryptography4010002,

Stonner, David Jakob ; Kysela, Jaroslav ; Weir, Graeme ; Novotny, Jaroslav ; Alber, Gernot ; Jex, Igor (2019):
Deterministic twirling with low resources.
In: Physics Letters A, 2019, Elsevier, DOI: 10.1016/j.physleta.2019.126179,
[Online-Edition: https://www.sciencedirect.com/science/article/pii/S037596011...],

Fladung, Lukas ; Nikolopoulos, Georgios M. ; Alber, Gernot ; Fischlin, Marc (2019):
Intercept-Resend Emulation Attacks against a Continuous-Variable Quantum Authentication Protocol with Physical Unclonable Keys.
3, In: Cryptography, (4), MDPI, DOI: 10.3390/cryptography3040025,

Stonner, David Jakob (2019):
Construction of Random Unitary Operations for Asymptotic Preparation of Werner States.
Darmstadt, Technische Universität Darmstadt, [Bachelorarbeit]

Nikolopoulos, Georgios M. (2019):
Cryptographic one-way function based on boson sampling.
18, In: Quantum Information Processing, 2019, (8), Springer Nature, S. 259, ISSN 1570-0755, e-ISSN 1573-1332, DOI: 10.1007/s11128-019-2372-9,

Zucker, René (2019):
Erstellung eines Python-Interfaces für die Erforschung von Polytopen in der Quanteninformationstheorie.
Darmstadt, TU Darmstadt, Fachbereich Informatik, [Bachelorarbeit]

Geihs, Matthias ; Nikiforov, Oleg ; Demirel, Denise ; Sauer, Alexander ; Butin, Denis ; Günther, Felix ; Alber, Gernot ; Walther, Thomas ; Buchmann, Johannes (2019):
The Status of Quantum-Based Long-Term Secure Communication over the Internet.
In: IEEE Transactions on Sustainable Computing, IEEE, ISSN 2377-3782, DOI: 10.1109/TSUSC.2019.2913948,
[Online-Edition: https://ieeexplore.ieee.org/document/8703121],

Roth, Kai (2019):
Entwicklung eines Schlüsselverwaltungssystems zum Quantenschlüsselaustausch.
Darmstadt, TU Darmstadt, [Masterarbeit]

Maier, Christine ; Brydges, Tiff ; Jurcevic, Petar ; Trautmann, Nils ; Hempel, Cornelius ; Lanyon, Ben P. ; Hauke, Philipp ; Blatt, Rainer ; Roos, Christian F. (2019):
Environment-Assisted Quantum Transport in a 10-qubit Network.
122, In: PHYSICAL REVIEW LETTERS, (5), American Physical Society, S. 050501, DOI: 10.1103/PhysRevLett.122.050501,
[Online-Edition: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12...],

Wegert, Leonard (2019):
Preparations for Assembling Franson Interferometers in a Quantum Key Distributuion Setup.
TU Darmstadt, [Bachelorarbeit]

McCracken, Gabriel (2018):
A Field Theory for Quantum Markov Processes.
TU Darmstadt, [Bachelorarbeit]

Marakis, Vassilios (2018):
Anwendung der semiklassischen Näherung auf Probleme des Zentralkraftfeldes und der Quantendefekttheorie.
TU Darmstadt, [Masterarbeit]

Humbert, Marcel Nikolas (2018):
Einführung in die Störungstheorie der Allgemeinen Relativitätstheorie.
TU Darmstadt, [Bachelorarbeit]

Baack, Leon (2018):
Optimisation of parts of a set-up for quantum key distribution.
TU Darmstadt, [Bachelorarbeit]

Gajewski, Marvin (2018):
Asymptotische Eigenschaften offener quantenoptischer Systeme.
TU Darmstadt, [Bachelorarbeit]

Wolf, Yannic (2018):
Eine Faserverstärkerstufe für den Quantenhub.
TU Darmstadt, [Bachelorarbeit]

Brandy, Malte (2018):
Asymptotische Eigenschaften iterierter Quantenoperationen.
TU Darmstadt, [Masterarbeit]

Hofmann, Daniel (2018):
Charakterisierung von verschränkten Photonenpaaren.
TU Darmstadt, [Masterarbeit]

Trautmann, Nils ; Hauke, Philipp (2018):
Trapped-ion quantum simulation of excitation transport: Disordered, noisy, and long-range connected quantum networks.
97, In: PHYSICAL REVIEW A, S. 023606, [Article]

Nikiforov, Oleg ; Sauer, Alexander ; Schickel, Johannes ; Weber, Alexandra ; Alber, Gernot ; Mantel, Heiko ; Walther, Thomas (2018):
Side-Channel Analysis of Privacy Amplification in Postprocessing Software for a Quantum Key Distribution System.

Deller, Yannick (2017):
Zweidimensionale Surface-Kodes und ihre Anwendungen.
TU Darmstadt, [Bachelorarbeit]

Fladung, Lukas (2017):
Semiclassical Laser Cooling of Trapped Ions in a One-Dimensional Standing Wave.
TU Darmstadt, [Bachelorarbeit]

Neumann, Klara Maria (2017):
Aufbau von Empfängerstationen für ein System zum Quantenschlüsselaustausch.
TU Darmstadt, [Bachelorarbeit]

Schürl, Stefan (2017):
Entwicklung eines FPGA-Systems zur hochauflösenden Zeitmessung.
TU Darmstadt, [Masterarbeit]

Nauth, Julian (2017):
Charakterisierung von Bellschen Ungleichungen bei nicht-perfekter Detektion.
TU Darmstadt, [Bachelorarbeit]

Langfeld, Benedikt (2017):
Vorbereitende Arbeiten zum Feldtest eines Systems zum Quantenschlüsselaustausch.
Darmstadt, Technische Universität, [Bachelorarbeit]

Trautmann, Nils ; Ferenczi, Gergely ; Croke, Sarah ; Barnett, Stephen (2017):
Holographic quantum imaging: reconstructing spatial properties via two-particle interference.
19, In: Journal of Optics, (5), IOP Publishing, [Online-Edition: http://iopscience.iop.org/article/10.1088/2040-8986/aa67b6],

Trautmann, Nils ; Sonnleitner, Matthias ; Barnett, Stephen (2017):
Will a Decaying Atom Feel a Friction Force?
In: Physical Review Letters, [Article]

Trautmann, Nils ; Alber, Gernot ; Leuchs, Gerd (2016):
Efficient single-photon absorption by a trapped moving atom.
In: Physical Review A, American Physical Society, S. 8, [Article]

Alber, Gernot ; Trautmann, Nils (2016):
Cooperative quantum electrodynamical processes in an ellipsoidal cavity.
In: Journal of Physics: Conference Series, [Article]

Trautmann, Nils ; Hauke, Philipp (2016):
Quantum simulation of the dynamical Casimir effect with trapped ions.
In: New Journal of Physics, (18), S. 043029, [Article]

Trautmann, Nils ; Alber, Gernot (2016):
Dissipation-enabled efficient excitation transfer from a single photon to a single quantum emitter.
In: Physical Review A, S. 9, DOI: 10.1103/PhysRevA.93.053807,

Frydrych, Holger ; Marthaler, Michael ; Alber, Gernot (2015):
Pulse-controlled quantum gate sequences on a strongly coupled qubit chain.
In: Phys. Rev. A, American Physical Society, (92), S. 10, [Article]

Novotny, Jaroslav ; Alber, Gernot ; Jex, Igor (2015):
Universality in random quantum networks.
92, 062335, In: Physical Review A, DOI: 10.1103/PhysRevA.92.062335,

Frydrych, H. ; Hoskovec, A. ; Jex, I. ; Alber, G. (2015):
Selective dynamical decoupling for quantum state transfer.
IOP Publishing, In: Journal of Physics B: Atomic, Molecular and Optical Physics, S. 025501, [Article]

Trautmann, N. ; Alber, G. ; Agarwal, G. S. ; Leuchs, G. (2015):
Time-Reversal-Symmetric Single-Photon Wave Packets for Free-Space Quantum Communication.
APS, In: PHYSICAL REVIEW LETTERS, S. 173601, [Article]

Trautmann, N. ; Bernad, J. Z. ; Sondermann, M. ; Alber, G. ; Sanchez-Soto, L. L. ; Leuchs, G. (2014):
Generation of entangled matter qubits in two opposing parabolic mirrors.
In: PHYSICAL REVIEW A 90, S. 063814, [Article]

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