-- STEP 1: Click left tab to select whether you want to build the quantum circuit with 2 Qubits or 3 Qubits.
-- STEP 2: Design your circuit by clicking locations and selecting gates
-- STEP 3: Input initial state a1, a2(and a3), the coefficient of 0 state (whose square is the probability of down spin) for each Qubit.
-- STEP 4: Is your circuit correctly designed? Check by ensuring every element in your checklist goes green!
-- FINAL STEP: Click Run to get the result for your quantum circuit!!