Practical Tests for Sub-Rayleigh Source Discrimination with Imperfect Demultiplexers
Konrad Schlichtholz, Tomasz Linowski, Mattia Walschaers, Nicolas Treps, Łukasz Rudnicki, Giacomo Sorelli · 2023
We show that quantum-optimal tests for discriminating between one and two light sources via spatial-mode demultiplexing become as good as flipping a coin in the presence of arbitrarily small imperfections, and we develop practical alternatives.