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Waves fail to propagate in random media. First predicted for quantumparticles in the presence of a disordered potential, Anderson localization hasbeen observed also in classical acoustics, electromagnetism and optics. Here,for the first time, we report the observation of Anderson localization of pairsof entangled photons in a two-particle discrete quantum walk affected byposition dependent disorder. A quantum walk on a disordered lattice is realizedby an integrated array of interferometers fabricated in glass by femtosecondlaser writing. A novel technique is used to introduce a controlled phase shiftinto each unit mesh of the network. Polarization entanglement is exploited tosimulate the different symmetries of the two-walker system. We are thus able toexperimentally investigate the genuine effect of (bosonic and fermionic)statistics in the absence of interaction between the particles. We will showhow different types of randomness and the symmetry of the wave-function affectthe localization of the entangled walkers.

Anderson localization of entangled photons in an integrated quantum walk