Środowiskowe Seminarium z Informacji i Technologii Kwantowych

All-photonic quantum repeaters offer a promising avenue for establishing long-range quantum entanglement. Within repeater nodes, reliably performing entanglement swapping is a key component of scalable quantum communication. To tackle the challenge of probabilistic Bell state measurement in linear optics, which often leads to information loss, various approaches have been proposed to ensure the loss tolerance of distributing a single ebit. In the first part of the talk, I will introduce our generalization of the repeater graph states with elaborate connectivity, which enables efficient establishment of exploitable ebits at a finite rate with high probability. In the second part I will discuss efficient strategies of generating such generalized repeater graph states using single photon sources and linear optics. I will show how using the tools from graph theory as well as simulated annealing we can reduce the number of required photon sources by nearly two orders of magnitude relative to existing strategies. These findings offer new insights into the scalability and reliability of loss-tolerant quantum networks. The talk is based on Phys. Rev. Lett. 134, 190801 (2025) and arXiv:2506.00292 (2025).