Basis Measurement Visualizer | Turn lessons into working experiments

Starter code

module basis_measurement;
@seed(3);

fn main() {
  let q: QReg<3> = qreg[3];

  H(q[0]);
  H(q[1]);
  S(q[1]);

  let mx: Bit = measure X(q[0]);
  let my: Bit = measure Y(q[1]);
  let mz: Bit = measure Z(q[2]);

  return (mx, my, mz);
}

Expected output

q[0] is sampled in X basis after H creates |+>

q[1] is sampled in Y basis after H then S creates |+i>

The Circuit tab labels the measurements as MX, MY, and MZ

Debugging checklist

Run the circuit and read the Output tab

Open the Circuit tab and find MX, MY, and MZ

Change measure X(q[0]) to measure Z(q[0]) and compare the result

Explain why changing the measurement basis can reveal phase information

Extension challenge

Remove S(q[1]) and explain why the Y-basis measurement becomes random.