Quantum Hall realization of polarized intensity interferometry

TL;DR

This paper proposes a novel quantum Hall-based interferometer that uses spin manipulation and noise correlations to perform polarized intensity interferometry, advancing quantum measurement techniques.

Contribution

It introduces a new interferometry scheme in quantum Hall systems combining spin control, polarization optics, and Bell's measurement concepts.

Findings

Oscillations in cross-correlated noise observed with in-plane magnetization rotation

Numerical simulations show feasibility with current experimental spin manipulation techniques

Proposal integrates intensity interferometry with quantum Hall edge state control

Abstract

We combine the ideas of intensity interferometry, polarization optics and Bell's measurement into an experimental proposal which is hosted in a $\nu\,$=$\,2$ quantum Hall (QH) edge state. Our interferometer comprises of a single gate, that separates the spin resolved edge states of $\nu$\,=\,$2$ state. An analog of waveplate (from polarization optics) is realized by exposing the individual edges to nano-magnets over a finite length which facilitates coherent manipulation of the electron spin on the edge. We show that the in-plane rotation of magnetization direction of the nano-magnets results in oscillations observed solely in the cross-correlated noise which arises from two particle interference. Through numerical simulations we demonstrate that our proposal is well within the reach of recent experimental developments of spin manipulations on the QH edge.