Correlations of indistinguishable photons in quantum walks under broken PT-symmetry

We experimentally study the correlations of indistinguishable photons in a one-dimensional Parity-Time (PT) symmetric quantum walk. Introducing a symmetric loss distribution in a homogeneous waveguide system gives rise to PT-symmetry, which drastically alters the correlations of indistinguishable photons, giving rise to e.g. correlations similar to distinguishable classical particles in a random walk.