Questions

1. What’s the output of the following circuit?

2. Try to find values of , , , and satisfying . (It can’t be done because the two qubits in question are entangled.)
3. Show that the circuit in Figure 4.22 creates the state by writing the circuit’s matrix representation and calculating the circuit’s output.
4. Modify the code in this chapter’s Working with Qiskit section so that the resulting state is . Output a multi-qubit sphere like the one shown in Figure 4.18.
5. Between 1983 and 1993, there were approximately 105 boys born in the US for every 100 US-born girls. Given this ratio, what’s the probability that a family of three would have exactly two girls and one boy (in no particular order)?
6. In this chapter’s What would happen if there were hidden variables? section, we conclude that the overall probability of measurement disagreement is at least . We say at least because this...