### State representation in Spinach

Posted:

**Tue Sep 21, 2021 9:59 am**I have a question about the state representation in spinach.

First, let me start by thanking you, it is a great tool. We are using it for simulating an experiment that we are implementing and it is incredibly helpful.

We are using sphten-liouv basis for a 3-spin system. The state is an array with 64 elements. According to the documentation, these should be the coefficients of the product of the Pauli operators. But I am trying to figure out the order of the operators. For instance, is the second element the coefficient for I * I * X or X * I * I or something else?

Your help and time are much appreciated.

First, let me start by thanking you, it is a great tool. We are using it for simulating an experiment that we are implementing and it is incredibly helpful.

We are using sphten-liouv basis for a 3-spin system. The state is an array with 64 elements. According to the documentation, these should be the coefficients of the product of the Pauli operators. But I am trying to figure out the order of the operators. For instance, is the second element the coefficient for I * I * X or X * I * I or something else?

Your help and time are much appreciated.