BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Drupal iCal API//EN X-WR-CALNAME:Events items teaser BEGIN:VEVENT UID:633b8f2bbed45 DTSTART;TZID=America/Toronto:20220811T140000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20220811T150000 SUMMARY:Uncertainty Relations from Graph Theory CLASS:PUBLIC DESCRIPTION:Summary \n\nQuantum measurements are inherently probabilistic. Further defying our\nclassical intuition\, quantum theory often forbids us to precisely\ndetermine the outcomes of simultaneous measurements. This p henomenon\nis captured and quantified through uncertainty relations. Altho ugh\nstudied since the inception of quantum theory\, this problem of\ndete rmining the possible expectation values of a collection of quantum\nmeasur ements remains\, in general\, unsolved. In this talk\, we will go\nover s ome basic notions of graph theory that will allow us to derive\nuncertaint y relations valid for any set of dichotomic quantum\nobservables. We will then specify the many cases for which these\nrelations are tight\, dependi ng on properties of some graphs\, and\ndiscuss a conjecture for the untigh t cases. Finally\, we will show some\ndirect applications to several probl ems in quantum information\,\nnamely\, in constructing entropic uncertaint y relations\, separability\ncriteria and entanglement witnesses.\n\n \n\n  \n\n \n DTSTAMP:20221004T014059Z END:VEVENT END:VCALENDAR