We studied the effect of delocalized single-photon addition (DPA) on two input modes containing four cases: two separate coherent states (CSs), two separate thermal states (TSs), two separate singlemode squeezed vacuums (SVs), and an entangled two-mode squeezed vacuum (TMSV). In essence, four kinds of new entangling light states are generated after DPA operation. We studied and compared the amount of entanglement, the discorrelation and the negativity of the Wigner functions (WFs) for each two-mode light state. Compared with the initial Gaussian (separable or entangled) states, the generated states are delocalized, with more parameters and complex structures, characterizing more entanglement, negative WFs or even discorrelation.
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