= Quantum information
{scope}
{title2=A16608W1}
Source paper: https://www.whatdotheyknow.com/request/ba_computer_science_past_papers/response/2577745/attach/2/202402%20183%20CS%20Papers.zip?cookie_passthrough=1[released examination archive], member `2020/T/a16608w1.pdf`. The printed sitting is 27 May 2021; the ZIP directory names 2020. All three questions and all 21 marked subparts are answered. This is the canonical CS paper; the raster-identical Physics-held copy is a source reference, while Mathematics C7.4 is a different examination.<Quantum information examination paper A16608W1 (2021)>[Cover and printed pages 2–5; all three questions]{ref}
An identical copy is available in https://www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/9/Physics%20Papers%202020.pdf?cookie_passthrough=1#page=111[the released combined PDF, pages 111–115]. Its historical folder and attachment name do not change the Computer Science cover identity.
Tensor factors follow their displayed subsystem order, and the rightmost operator acts first. Computational labels are $0,1$; Hadamard- and Pauli-Y-basis labels are the corresponding plus/minus <eigenvalue> labels. The exact correlations in Question 2 are interpreted as ideal <probability>-one predictions, not certainty inferred from a finite experimental sample.
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