Extracting the Anyonic Exchange Phase from Hanbury Brown-Twiss Correlations

Felix Puster; Matthias Thamm; Bernd Rosenow

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arXiv · 2603.13898

Extracting the Anyonic Exchange Phase from Hanbury Brown-Twiss Correlations

Felix Puster·Matthias Thamm·Bernd Rosenow

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Abstract

In recent years, interferometry experiments in fractional quantum Hall devices have reported signatures of a fractional braiding phase for quasiparticles. It was noted, however, that the braiding phase alone does not uniquely determine the exchange phase because of a $\pi$-ambiguity. Here we analyze a Hanbury Brown-Twiss interferometer in a cross geometry that provides direct access to the fractional exchange phase. Using a non-equilibrium Keldysh calculation in an experimentally relevant regime, we show that the exchange phase can be obtained as the phase shift between Aharonov-Bohm oscillations in a single-particle interference current and those in the current cross-correlation arising from two-particle interference.

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Felix Puster, Matthias Thamm, Bernd Rosenow. 2026-03-14. Extracting the Anyonic Exchange Phase from Hanbury Brown-Twiss Correlations. https://arxiv.org/abs/2603.13898

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