{"id":1236,"date":"2021-09-21T11:11:56","date_gmt":"2021-09-21T09:11:56","guid":{"rendered":"https:\/\/webs.uab.cat\/giq\/seminar\/activation-of-genuine-multipartite-entanglement-beyond-the-single-copy-paradigm-of-entanglement-characterisation\/"},"modified":"2021-09-21T11:11:56","modified_gmt":"2021-09-21T09:11:56","slug":"activation-of-genuine-multipartite-entanglement-beyond-the-single-copy-paradigm-of-entanglement-characterisation","status":"publish","type":"seminar","link":"https:\/\/webs.uab.cat\/giq\/seminar\/activation-of-genuine-multipartite-entanglement-beyond-the-single-copy-paradigm-of-entanglement-characterisation\/","title":{"rendered":"Activation of genuine multipartite entanglement: beyond the single-copy paradigm of entanglement characterisation"},"content":{"rendered":"<p>Entanglement shared among multiple parties presents complex challenges for the characterisation<font color=\"#201f1e\" face=\"Calibri, sans-serif\" size=\"2\">&nbsp;<\/font>of different types of entanglement. One of the most basic insights is the fact that some mixed states&nbsp;can feature entanglement across every possible cut of a multipartite system, yet can be produced&nbsp;via a mixture of partially separable states. To distinguish states that genuinely cannot be produced&nbsp;from mixing partially separable states, the term genuine multipartite entanglement was coined. All&nbsp;these considerations originate in a paradigm where only a single copy of the state is distributed and&nbsp;locally acted upon. In contrast, advances in quantum technologies prompt the question of how this&nbsp;picture changes when multiple copies of the same state become locally accessible. Here we show that&nbsp;multiple copies unlock genuine multipartite entanglement from partially separable states, even from&nbsp;undistillable ensembles, and even more than two copies can be required to observe this effect. With&nbsp;these findings, we characterise the notion of partial separability in the paradigm of multiple copies&nbsp;and conjecture a strict hierarchy of activatable states and an asymptotic collapse of hierarchy.&nbsp;<a data-auth=\"NotApplicable\" data-linkindex=\"0\" href=\"https:\/\/arxiv.org\/abs\/2106.01372\" id=\"LPlnk875181\" rel=\"noopener noreferrer\" target=\"_blank\">https:\/\/arxiv.org\/abs\/2106.01372<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Entanglement shared among multiple parties presents complex challenges for the characterisation&nbsp;of different types of entanglement. One of the most basic insights is the fact that some mixed states&nbsp;can feature entanglement across every possible cut of a multipartite system, yet can be produced&nbsp;via a mixture of partially separable states. To distinguish states that genuinely cannot be [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":0,"template":"","class_list":["post-1236","seminar","type-seminar","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/seminar\/1236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/seminar"}],"about":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/types\/seminar"}],"author":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/users\/20"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/media?parent=1236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}