Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨X⟩ does it have along the Bloch X-axis?
const gamma = Math.PI / 8; const beta = Math.PI / 8; const c = circuit(3); c.h(0); c.h(1); c.h(2); // edge (0, 1) c.cx(0, 1); c.rz(-2 * gamma, 1); c.cx(0, 1); // edge (1, 2) c.cx(1, 2); c.rz(-2 * gamma, 2); c.cx(1, 2); // edge (0, 2) c.cx(0, 2); c.rz(-2 * gamma, 2); c.cx(0, 2); c.rx(2 * beta, 0); c.rx(2 * beta, 1); c.rx(2 * beta, 2); c.measure(); return c;
Commit your prediction for ⟨X⟩ of qubit 0 — then run it.