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Past exam of the mathematics course of the University of Cambridge / 2005 / iii / Paper 37 / 2 / b / ii

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2005 iii Paper 37 2 b
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ii
Factor the coefficients into a tensor product:
∣Ψ⟩=(2​∣0⟩−∣1⟩​)A​⊗(2​∣0⟩−∣1⟩​)B​.
(1)
This is already a Schmidt decomposition with one term. Consequently
r=1,s1​=1,λ1​=1.​
(2)
Each reduced density matrix is the rank-one orthogonal projector onto (∣0⟩−∣1⟩)/2​, so its other eigenvalue is zero. The joint pure state is a product state, with no entanglement.

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