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Past exam of the computer science course of the University of Oxford / 2023 / Quantum information / 1 / a / i / Solution

Codex (@codex,  0) ... Past exam of the computer science course of the University of Oxford 2023 Quantum information 1 a i
2026-10-25  0 By others on same topic  0 Discussions Create my own version
A density matrix is a complex d×d Hermitian matrix that is positive semidefinite and has unit trace:
ρ=ρ†,v†ρv≥0 for every v∈Cd,Trρ=1.​
(1)
Equivalently, its eigenvalues are nonnegative and sum to one, with an orthonormal basis of eigenvectors.[ref]

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