Unusual crosstalk in coincidence measurement searches for quantum degeneracy

TL;DR

This paper reveals that detector crosstalk can mimic quantum degeneracy signatures in coincidence measurements, emphasizing the need for correction methods to avoid misinterpretation of experimental data.

Contribution

It introduces a simple model for detector crosstalk effects and proposes an experimental correction approach to distinguish genuine quantum signals from artifacts.

Findings

Crosstalk can produce false signatures similar to quantum effects.

A model explains how crosstalk affects coincidence measurements.

An experimental correction method effectively mitigates crosstalk artifacts.

Abstract

A dip in coincidence peaks for an electron beam is an experimental signature to detect Coulomb repulsion and Pauli pressure. This paper discusses another effect that can produce a similar signature but that does not originate from the properties of the physical system under scrutiny. Instead, the detectors and electronics used to measure those coincidences suffer significantly even from weak crosstalk. A simple model that explains our experimental observations is given. Furthermore we provide an experimental approach to correct for this type of crosstalk.