Quantum Country exercise 11

This is one in a series of posts working through the exercises in the Quantum Country online introduction to quantum computing and related topics. The exercises in the original document are not numbered; I have added my own numbers for convenience in referring to them.

Exercise 11. Find single-qubit states \vert a \rangle and \vert b \rangle such that applying the CNOT gate to the combined state \vert ab \rangle changes the first qubit, i.e., the control qubit.

Answer: This is a placeholder for when I get around to looking at this problem in depth.

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