Entanglement source preparation via three-photon quantum scissors enhanced by realistic conditions

In quantum information processing, the preparation and optimization of entanglement sources are critical steps. This paper explores reality-enhanced entanglement in two-mode squeezed vacuum states via three-photon quantum scissors (3-QS). Crucially, in realistic scenarios, the optimized 3-QS scheme achieves stronger entanglement than ideal scenarios while expanding the effective enhancement range. By adjusting beam-splitter transmittance in experimentally accessible weak squeezing regimes, we achieve enhanced entanglement and higher quantum teleportation fidelity compared to conventional strong squeezing approaches. This scheme provides a practical path toward long-distance quantum communication by transforming low-quality squeezed states into high-fidelity entanglement resources.