Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Quantum Optics and Control I
Q 56.3: Vortrag
Donnerstag, 5. März 2026, 15:15–15:30, P 3
Universal pump shaping for high-dimensional maximally entangled states — •Richard Bernecker1,2, Baghdasar Baghdasaryan3, and Stephan Fritzsche1,2 — 1Institute for Theoretical Physics, Friedrich Schiller University Jena, Fröbelstieg 1, 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
Spatial entanglement in orbital angular momentum (OAM) modes has proven to be a powerful resource for high-dimensional quantum information processing. In practice, however, the resulting two-photon states are typically not maximally entangled due to a highly non-uniform OAM spectrum. While most studies over the past decades have focused on various approaches to controlling the OAM distribution, a general understanding of the requirements for generating maximally entangled states (MESs) in arbitrary d × d subspaces with d > 2 remains lacking. MESs are the high-dimensional analogues of Bell states and constitute ideal resources for quantum information tasks.
In this contribution, we present a generalized and universal approach to spatial pump-beam engineering that enables the generation of maximally entangled states (MESs) via spontaneous parametric down-conversion. We demonstrate that a tailored superposition of Laguerre-Gaussian (LG) pump modes, combined with an optimized choice of subspace, allows controlled engineering of MESs with arbitrary dimensionality d.
Keywords: High-dimensional entanglement; Laguerre-Gaussian modes; Orbital angular momentum; Photon pairs; Spontaneous parametric down-conversion