Scaling up multi-mode entanglement generated by mode swapping
The research investigates generating entanglement between two local multi-photon systems by swapping a pair of modes between them. By applying specific unitary transformations and analyzing an asymmetric three-photon input state, the study demonstrates that mode swapping creates non-local correlations in photon number statistics. This method shows how mode swapping can be used to engineer entanglement in complex optical circuits.