In our new paper Homomorphism Indistinguishability Relations induced by Quantum Groups (with Gian Luca Spitzer) we give an alternative proof of Mančinska and Roberson’s seminal characterisation of quantum isomorphism as homomorphism indistinguishability over planar graphs. We furthermore exhaustively classify the homomorphism indistinguishability characterisations that arise from other easy orthogonal quantum groups. This paper is based on Gian Luca’s MSc thesis. Check it out!