const T = 1.0;
const slices = 2;
const dt = T / slices; // 0.5
const c = circuit(1);
for (let k = 0; k < slices; k++) {
  const tMid = (k + 0.5) * dt; // midpoint of slice k
  const g = tMid;              // g(t) = t
  c.rx(2 * g * dt, 0);        // exp(-i g X dt) = RX(2 g dt)
}
return c;