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Thanks! It helps me a lot, but I'm still having some doubts about this result. Here the nuclear spin is initialized to the Lx state and begins to evolve under the Hamiltonian. In my understanding, shouldn't the starting point be at the coordinate (1,0,0), and the entire trajectory be on the Bloch sp...

I'm trying to simulate the precession trajectory of a quadrupole nuclear spin under an electric field gradient with a zero magnetic field. It is the effect of nuclear quadrupolar coupling. But my simulation turns out that the direction of the nuclear spin hasn't changed at all, and the trajectory is...

How to get the direction of spin on the Bloch sphere? Suppose I get a result of spin state vectors by function evolution, is there any function which visualizes it or calculate its value on the Bloch sphere?