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arXiv · 2608.10917

Quantum Signatures of Two-Electron HBT Interference in Free Space

Florian Fleischmann·Mona Bukenberger·Anton Classen·Marc-Oliver Pleinert·Joachim von Zanthier
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Abstract

Understanding how fermionic exchange and Coulomb repulsion jointly shape two-electron correlations is essential for identifying genuine quantum signatures in multi-electron interference experiments. To address this interplay, we investigate Hanbury Brown and Twiss interference of two electrons generated by two independent needle-tip emitters within a full quantum-mechanical framework. In the absence of Coulomb interaction, the approach reproduces the results previously obtained within a quantum path formalism. For Coulomb-interacting electrons, we predict characteristic features absent in a semiclassical description: a pronounced Coulomb-dominated suppression region as well as Coulomb-induced phase offsets and fringe shifts. At the same time, outside of the Coulomb-dominated region, the spatial oscillation frequency is essentially governed by fermionic exchange symmetry. Our results establish quantitative parameter regimes for disentangling Coulomb interaction from fermionic exchange symmetry in such experiments.

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Florian Fleischmann, Mona Bukenberger, Anton Classen, Marc-Oliver Pleinert, Joachim von Zanthier. 2026-08-11. Quantum Signatures of Two-Electron HBT Interference in Free Space. https://arxiv.org/abs/2608.10917

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