Bad Qubits — Learn Quantum by Doing

Multiple choice

Observable A has eigenvalues +2 (prob 3/4) and -2 (prob 1/4); observable B has eigenvalues +1 (prob 1/4) and -1 (prob 3/4). Compute the product of the standard deviations, Delta A * Delta B.

3 = 3.0
3/4 = 0.75
sqrt(3) ≈ 1.732
3/2 = 1.5