Papers & References

Conservation of angular momentum on a single-photon level

PLUTO / PLUTO-2 Spatial Light Modulators
Higher Order Modes / Optical Vortex / OAM Optical Computing / Quantum Optics
Published on:
Authors: Lea Kopf, Rafael Barros, Shashi Prabhakar, Enno Giese, and Robert Fickler
Abstract:

Identifying conservation laws is central to every subfield of physics, as they illuminate the underlying symmetries and fundamental principles. A prime example can be found in quantum optics: The conservation of orbital angular momentum (OAM) during spontaneous parametric down-conversion (SPDC) enables the generation of a photon pair with entangled OAM. In this article, we report on the first study of OAM conservation in SPDC pumped by single photons. Our results present the first implementation of cascaded down-conversion without waveguides, setting the stage for experiments on the direct generation of multi-photon high-dimensional entanglement using all degrees of freedom of light.

Open Access

Publication: Physical Review Letters
Issue/Year: Phys. Rev. Lett. 134, 203601 (2025)
DOI: 10.1103/PhysRevLett.134.203601
Link: https://doi.org/10.1103/PhysRevLett.134.203601
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