Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects
Q 26.18: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
High-dimensional maximally entangled photon pairs in parametric down-conversion — •Richard Bernecker1,2, Baghdasar Baghdasaryan3, and Stephan Fritzsche1,2 — 1Institute for Theoretical Physics, Friedrich Schiller University Jena, 07743 Jena, Germany — 2Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — 3Institute of Applied Physics, Friedrich Schiller University Jena, Albert-Einstein-Str. 6, 07745 Jena, Germany
Photon pairs generated through spontaneous parametric down-conversion constitute a well-established approach for creating entangled bipartite systems. Laguerre-Gaussian modes, which carry orbital angular momentum (OAM), are commonly used to engineer high-dimensional entangled quantum states within the spatial domain. For Hilbert spaces with dimension d>2, maximally entangled states (MESs) enhance the capacity and security of quantum communication protocols and increase the efficiency of quantum-computational tasks. However, directly generating MESs within well-defined high-dimensional subspaces of the infinite OAM basis remains challenging. In this work, we formalize how the spatial distribution of the pump beam and phase-matching conditions within the nonlinear crystal can be utilized to generate MESs without additional spatial filtering of OAM modes in a given subspace. We demonstrate our method with maximally entangled qutrits (d=3) and ququints (d=5).
Keywords: Quantum entanglement; High-dimensional entanglement; Quantum state engineering; Spontaneous parametric down-conversion; Orbital angular momentum