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QI: Fachverband Quanteninformation
QI 18: Quantum Networks, Repeaters, and QKD III (joint session Q/QI)
QI 18.4: Vortrag
Mittwoch, 12. März 2025, 11:45–12:00, AP-HS
Feasibility of Long-Distance Multi-Photon Interference in Satellite-Based Quantum Networks — •Baghdasar Baghdasaryan1, Karen Lozano Méndez2, Meritxell Cabrejo Ponce2, Stephan Fritzsche3,4, and Fabian Steinlechner1,2 — 1Institut für Angewandte Physik, Jena, Germany — 2Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Jena, Germany — 3Theoretisch-Physikalisches Institut, Jena, Germany — 4Helmholtz-Institut, Jena, Germany
Interference of multi-photon states involves the interaction of two photons on a beam splitter, where the photons must be indistinguishable across all degrees of freedom. Temporal indistinguishability occurs when the photons can not be distinguished based on their arrival times. This can be achieved with time-synchronized pulsed photon sources by controlling photon generation times. However, time synchronization is challenging in satellite-based communication systems due to satellite motion. A promising alternative is the use of photon sources with continuous emission. Temporally indistinguishable photons can be post-selected by carefully measuring the respective arrival times. While post-selection eliminates the need for active time synchronization, the finite resolution of detectors limits the precision of time-resolved detection. Here, we examine the impact of limited detector resolution on the efficiency of multi-photon interference with a focus on entanglement swapping. We estimate the maximum achievable entangled photon pair rate by optimizing the performance of the source and analyzing potential losses in a Earth-satellite link.
Keywords: Entanglement Swapping; Multi-Photon Interference; Detector Resolution; Satellite-Based Quantum Networks; Temporal Indistinguishability