negative expectation values in tutorial
marekyggdrasil opened this issue · 1 comments
marekyggdrasil commented
Obviously I'm new to QuTip, while browsing I noticed y-axis in those graphs is marked as expectation value however expectation value is representing a measurement it cannot be negative.
nathanshammah commented
Probabilities cannot be negative. Measurements of observables can be negative. For example a spin projected on a given direction can point up (+1) or down (-1) and oscillate, as shown in these plots.