const c = circuit(2);
// Round A on qubit 0: Alice sends bit 1 in the X basis -> |->.
c.x(0);
c.h(0);
// Bob measures qubit 0 in the X basis: rotate X -> Z with H.
c.h(0);
// Round B on qubit 1: Alice sends bit 0 in the Z basis -> |0> (no gate).
// Bob measures qubit 1 in the Z basis (no rotation needed).
c.measure();
return c;