Quantum information
= Quantum information
{scope}
{title2=A16608W1}
Solutions to all three questions of the 11 June 2020 paper. https://www.whatdotheyknow.com/request/ba_computer_science_past_papers/response/2577745/attach/2/202402%20183%20CS%20Papers.zip?cookie_passthrough=1[Released Oxford examination archive], member `2019/T/a16608w1.pdf`. The dated cover establishes 2020 despite the archive directory. All displayed state <vectors> are normalized unless described as unnormalized conditional <vectors>. We use column <vectors>, $|ij\rangle=|i\rangle\otimes|j\rangle$, and the left tensor factor as the first wire. In a product of gates, the rightmost gate acts first. A <global phase> is physically irrelevant, but all relative signs and phases below are retained.