const c = circuit(2);
// Subroutine A: Ry(pi/3) on qubit 0
c.ry(Math.PI / 3, 0);
// Oracle: phase-flip the good state |10>
// |10> has qubit 0 = 1 and qubit 1 = 0.
// Strategy: X on qubit 1 turns |10> into |11>; CZ phase-flips |11>; X restores.
c.x(1);
c.cz(0, 1);
c.x(1);
// Diffuser: reflect about A|00> = Ry(pi/3)|0> x |0>
// = A_dag, phase-flip |00>, A
c.ry(-Math.PI / 3, 0);       // A_dag
c.x(0); c.x(1);               // map |00> to |11>
c.cz(0, 1);                   // phase-flip |11> (= phase-flip |00> up to global phase)
c.x(0); c.x(1);               // restore
c.ry(Math.PI / 3, 0);        // A
return c;