 Quantum information

Solutions to all three questions of the 15 June 2019 paper. Released Oxford examination archive, member 2018/T/a16608w1.pdf. The dated cover establishes 2019 despite that archive directory. Vectors are columns; the first tensor factor is the first wire; and the rightmost gate in an operator product acts first. Measurements use the printed outcome labels. Global phases are identified physically, with the approximation convention made explicit in Question 3(a). All five source pages and all 27 terminal parts are covered.