{"id":1264,"date":"2022-05-21T18:34:46","date_gmt":"2022-05-21T16:34:46","guid":{"rendered":"https:\/\/webs.uab.cat\/giq\/seminar\/projectiles-rockets-and-quantum-backflow\/"},"modified":"2022-05-21T18:34:46","modified_gmt":"2022-05-21T16:34:46","slug":"projectiles-rockets-and-quantum-backflow","status":"publish","type":"seminar","link":"https:\/\/webs.uab.cat\/giq\/seminar\/projectiles-rockets-and-quantum-backflow\/","title":{"rendered":"Projectiles, rockets and quantum backflow"},"content":{"rendered":"<p>Consider a scenario where a non-relativistic one-dimensional quantum particle is prepared in some bounded region of space and left to&nbsp;propagate freely. After a certain amount time, we measure if the particle is in some distant target region. In this talk, I will prove the&nbsp;existence of `ultra-fast&#8217; initial quantum states, for which the probability of arrival is greater than that of any classical system prepared in&nbsp;the same region with the same momentum distribution. Similarly, I will introduce the notion of `ultra-slow&#8217; states, which arrive at the&nbsp;target region with probability strictly smaller than any classical system. Remarkably, the magnitude of such mismatches between&nbsp;classical and quantum predictions is independent of the distance between the preparation and target regions, and it increases with the&nbsp;projectile\u2019s mass. I will relate the maximum possible quantum advantage with the old phenomenon of quantum backflow and explore&nbsp;some variants of the original scenario in order to increase this value.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Consider a scenario where a non-relativistic one-dimensional quantum particle is prepared in some bounded region of space and left to&nbsp;propagate freely. After a certain amount time, we measure if the particle is in some distant target region. In this talk, I will prove the&nbsp;existence of `ultra-fast&#8217; initial quantum states, for which the probability of arrival [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":0,"template":"","class_list":["post-1264","seminar","type-seminar","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/giq\/wp-json\/wp\/v2\/seminar\/1264","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=1264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}