Imaginary part of expextation

[imm...@gmail.com]

The output of expectation values  of sigmap of mesolve() with hamiltonian sigmay is a array of real parts with 0 for imaginary .but it should be nonzero. What’s the problem¿

[Andrew M. C. Dawes]

We could probably help answer this if you included the code you used.

On Wed, Nov 6, 2019 at 2:56 AM <imm...@gmail.com> wrote:

The output of expectation values  of sigmap of mesolve() with hamiltonian sigmay is a array of real parts with 0 for imaginary .but it should be nonzero. What’s the problem¿

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[ss...@cornell.edu]

Does it depend on the initial state? I would think that if the state is moving on the $\phi=0$ circle of the Bloch sphere, then this expectation value will be real.