Activity: Talk or presentation › Oral presentation
We demonstrate quantum interference in multiple-scattering materials. Starting with on the order of 103 coupled channels we create the equivalent of a 2×2 linear optical circuit with programmable correlations by adaptive phase modulation of incident wavefronts. This results in fully programmable Hong-Ou-Mandel interference, showing bunching as well as antibunching of output photons. Our results establish multiple-scattering materials as a platform for adaptive high-dimensional quantum interference experiments, as required, e.g., for boson sampling. Moreover, since multiple-scattering materials are excellent physical unclonable functions for use as optical keys in quantum-secure authentication, our results show the feasibility of including optical keys in other quantum-information protocols.