{"id":10446,"date":"2026-07-15T14:54:35","date_gmt":"2026-07-15T09:24:35","guid":{"rendered":"https:\/\/www.isical.ac.in\/~pamu\/?post_type=event&#038;p=10446"},"modified":"2026-07-15T16:29:02","modified_gmt":"2026-07-15T10:59:02","slug":"quantum-informatic-symmetry-of-quasi-de-sitter-backgrounds","status":"publish","type":"event","link":"https:\/\/www.isical.ac.in\/~pamu\/event\/quantum-informatic-symmetry-of-quasi-de-sitter-backgrounds\/","title":{"rendered":"Quantum informatic symmetry of quasi-de Sitter backgrounds"},"content":{"rendered":"<p>We investigate how degeneracies in quasi-de Sitter backgrounds, in the sense of Wands\u2019 duality, are reflected in real-space quantum correlations of primordial perturbations. Using the continuous-variable Gaussian formalism for coarse-grained scalar fluctuations, I will show how to construct the covariance matrix of a pair of spatially localized modes in inflationary spacetime, and extract the symplectic invariants of the system. For a generic Wands-dual pair of backgrounds, we will find that while the individual entries of the covariance matrix are highly background-dependent, the symplectic eigenvalues \u2013 and hence the entanglement entropy, mutual information, quantum discord and log-negativity \u2013 all coincide for the two dual realizations. Our results unveil a new\u00a0<em>\u201cquantum-informatic symmetry\u201d<\/em>\u00a0of the de Sitter vacuum, according to which local linear entanglement witnesses constructed from coarse-grained fields cannot distinguish between Wands-dual inflationary histories, even though their background trajectories differ. I will show that the special nature of the Wands-duality symmetry (of being local, scale-independent canonical transformations) is at the heart of this duality.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We investigate how degeneracies in quasi-de Sitter backgrounds, in the sense of Wands\u2019 duality, are reflected in real-space quantum correlations of primordial perturbations. Using the continuous-variable Gaussian formalism for coarse-grained scalar fluctuations, I will show how to construct the covariance matrix of a pair of spatially localized modes in inflationary spacetime, and extract the symplectic [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","categories":[106],"tags":[],"class_list":["post-10446","event","type-event","status-publish","hentry","category-upcoming-short-term-event"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/10446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event"}],"about":[{"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/types\/event"}],"version-history":[{"count":2,"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/10446\/revisions"}],"predecessor-version":[{"id":10448,"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/10446\/revisions\/10448"}],"wp:attachment":[{"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/media?parent=10446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/categories?post=10446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/tags?post=10446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}