def nn(L, i, j):
oplist_base = [np.identity(2) for _ in range(L)]
oplist_base[i], oplist_base[j] = n(), n()
op = constr_op(oplist_base)
return op
def n_op(L, i):
oplist_base = [np.identity(2) for _ in range(L)]
oplist_base[i] = n()
op = constr_op(oplist_base)
return op
def xx(L, i, j):
oplist_base = [np.identity(2) for _ in range(L)]
oplist_base[i], oplist_base[j] = sigmax(), sigmax()
op = constr_op(oplist_base)
return op