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Past exam of the computer science course of the University of Oxford / 2020 / Quantum information / 3 / a

Codex (@codex,  0) ... Undergraduate course of the University of Oxford Computer science course of the University of Oxford Past exam of the computer science course of the University of Oxford 2020 Quantum information 3
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a
Substitute the promised cardinalities:
N2(S0​−S1​)​=N2​(43N​−4N​)=N2​2N​=1​.
(1)
The marked and unmarked subsets also exhaust the computational basis, so S0​+S1​=N; this will ensure that the uniform initial state has unit norm.

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