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Fourth-order interference is an information processing primitive for photonicquantum technologies. When used in conjunction with post-selection, it formsthe basis of photonic controlled logic gates, entangling measurements, and canbe used to produce quantum correlations. Here, using classical weak coherentstates as inputs, we study fourth-order interference in novel $4 \times 4$multi-port beam splitters built within multi-core optical fibers. Using twomutually incoherent weak laser pulses as inputs, we observe high-quality fourthorder interference between photons from different cores, as well asself-interference of a two-photon wavepacket. In addition, we show that quantumcorrelations, in the form of quantum discord, can be maximized by controllingthe intensity ratio between the two input weak coherent states. This shouldallow for the exploitation of quantum correlations in future telecommunicationnetworks.

Maximizing Post-selected Quantum Correlations from Classical Interference in a Multi-core Fiber Beamsplitter