{"id":2523,"date":"2026-02-17T13:10:38","date_gmt":"2026-02-17T11:10:38","guid":{"rendered":"https:\/\/webs.uab.cat\/giq\/?post_type=seminar&#038;p=2523"},"modified":"2026-02-17T13:12:46","modified_gmt":"2026-02-17T11:12:46","slug":"many-body-k-local-ground-states-as-probes-for-unitary-quantum-metrology","status":"publish","type":"seminar","link":"https:\/\/webs.uab.cat\/giq\/seminar\/many-body-k-local-ground-states-as-probes-for-unitary-quantum-metrology\/","title":{"rendered":"\u00a0Many-body k-local ground states as probes for unitary quantum metrology\u00a0"},"content":{"rendered":"\n<p>Multipartite quantum states saturating the Heisenberg limit of sensitivity typically require full-body correlators to be prepared. On the other hand, experimentally practical Hamiltonians often involve few-body correlators only. Here, we study the metrological performances under this constraint, using tools derived from the quantum Fisher information. Our work applies to any encoding generator, also including a dependence on the parameter. We find that typical random symmetric ground states of k-body permutation-invariant Hamiltonians exhibit Heisenberg scaling. Finally, we establish a tradeoff between the Hamiltonian\u2019s gap, which quantifies preparation hardness, and the quantum Fisher information of the corresponding ground state.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Multipartite quantum states saturating the Heisenberg limit of sensitivity typically require full-body correlators to be prepared. On the other hand, experimentally practical Hamiltonians often involve few-body correlators only. Here, we study the metrological performances under this constraint, using tools derived from the quantum Fisher information. Our work applies to any encoding generator, also including a [&hellip;]<\/p>\n","protected":false},"author":3002,"featured_media":0,"template":"","class_list":["post-2523","seminar","type-seminar","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/seminar\/2523","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\/3002"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/media?parent=2523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}