S. Bäuml, K. Azuma, G. Kato, and D. Elkouss, “Linear programs for entanglement and key distribution in the quantum internet,” Commun. Phys. 355 (2020). [Crossref] S. Pirandola, “General upper bounds for distributing conferencing keys in arbitrary quantum networks,” IET Quantum Commun. 1, 22–25 (2020). [Crossref] P. J. Brown, S. Ragy, and R. Colbeck, “A framework for quantum-secure device-independent randomness expansion,” IEEE Trans. Inf. Theory 66, 2964–2987 (2020). [Crossref] Y. Zhang, H. Fu, and E.