Purity is a key resource in quantum technologies; it is therefore natural to want to increase the amount one has. Here, we develop a purity enhancement protocol by considering the related, but distinct task of athermality enhancement. Specifically, we consider the tasks of unitarily cooling a thermal qubit given access to n-other thermal qubits, presenting an algorithm that both generates the optimal cooling dynamics and calculates the amount of cooling achievable. We then show how the algorithm can be generalised into a purity enhancement protocol for arbitrary states. It is then discussed how this relates to the framework of informational non-equilibrium concentration \u2014 which asks by how much we can increase the local informational non-equilibrium given an initial product state \u03c1 \u2297 \u03c1 and access to global unitary operations.<\/p>\n\n\n\n
The talk is based on the following pieces of work: https:\/\/arxiv.org\/abs\/2506.10059<\/a>, https:\/\/arxiv.org\/abs\/2409.12759<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" Purity is a key resource in quantum technologies; it is therefore natural to want to increase the amount one has. Here, we develop a purity enhancement protocol by considering the related, but distinct task of athermality enhancement. Specifically, we consider the tasks of unitarily cooling a thermal qubit given access to n-other thermal qubits, presenting […]<\/p>\n","protected":false},"author":2605,"featured_media":0,"template":"","class_list":["post-2481","seminar","type-seminar","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/seminar\/2481","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\/2605"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/media?parent=2481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}