Defining Pauli Matrices

[orodrigoaraizabravo]

Hello, I want to get the cumulant expansion equations with real coefficients so I can evolve them using an ordinary differential equation solver for real-valued ODEs. This is doable when no jump operators if the cumulants can be recast in terms of Pauli matrices. Can you provide me with an example of how to code the Pauli-X matrix? Something like this: PauliX(n) is the Pauli-x matrix acting on site n where Pauli_x is the matrix |g><e|+|e><g|.

Thanks!