BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:A.S. Trushechkin DTSTART:20240911T120000Z DTEND:20240911T133000Z DTSTAMP:20260423T005651Z UID:QOART/54 DESCRIPTION:Title: Q uantum communication networks with bipartite entanglement sources\nby A.S. Trushechkin as part of Quantum Optics and Related Topics\n\n\nAbstrac t\nQuantum networks attract much interest now. One of obvious purposes of quantum networks is secure communications. The usual quantum key distribut ion (QKD) deals with bipartite communication\, but scaling of QKD to netwo rk solutions is developed now. In the first part of the talk\, we will con sider networks of users connected by bipartite QKD links. Such networks al ready exist. A problem arises: Having a network of bipartite QKD links\, h ow to generate a conference key at maximal rate? An optimal solution is gi ven by a spanning-tree-packing protocol for conference key propagation.\n\ nThe second part of the talk will be devoted to foreseeable future quantum networks with bipartite entanglement sources. Such networks provide more possibilities and problems to be considered. The problem of conference key distribution is still relevant for these networks (but with more possibil ities). A fully quantum counterpart of this problem is the Greenberger-Hor ne-Zeilinger (GHZ) multipartite entangled state distillation. GHZ states f ind many cryptographic\, metrologic and computational applications. Spanni ng tree packing protocol also can be used for GHZ distillation and is also optimal whenever the distributed bipartite entangled states are pure. For general (mixed) bipartite quantum states\, we present fundamental bounds on the conference key distribution and GHZ distillation rates for such net works.\n LOCATION:https://researchseminars.org/talk/QOART/54/ END:VEVENT END:VCALENDAR