Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 32: Quantum Communication II: Implementations (joint session QI/Q)
QI 32.7: Vortrag
Donnerstag, 13. März 2025, 16:00–16:15, HS IX
Pulse shape optimization against Doppler shifts and delays in optical quantum communication — •Emanuel Schlake1,2,3, Roy Barzel1,2, Dennis Rätzel1,2, and Claus Lämmerzahl1,2 — 1ZARM, University of Bremen, 28359 Bremen, Germany — 2Gauss-Olbers Space Technology Transfer Center, University of Bremen, 28359 Bremen, Germany — 3Department of Communications Engineering, University of Bremen, 28359 Bremen, Germany
High relative velocities and large distances in space-based quantum communication with satellites in lower earth orbits can lead to significant Doppler shifts and delays of the signal impairing the achievable performance if uncorrected. We analyze the influence of systematic and stochastic Doppler shift and delay in the specific case of a continuous variable quantum key distribution (CV-QKD) protocol and identify the generalized correlation function, the ambiguity function, as a decisive measure of performance loss. Investigating the generalized correlations as well as private capacity bounds for specific choices of spectral amplitude shape (Gaussian, single- and double-sided Lorentzian), we find that this choice has a significant impact on the robustness of the quantum communication protocol to spectral and temporal synchronization errors. We conclude that optimizing the pulse shape can be a building block in the resilient design of quantum network infrastructure.
Keywords: Quantum Communication; Continuous variable quantum key distribution; Space-based communication; Doppler shift and delay; Pulse shape