update latex and corrected test inputs

src/qutip_qip/operations/gateclass.py

@@ -872,10 +872,10 @@ class MS(TwoQubitGate):
     .. math::
 
         \begin{pmatrix}
-        \cos(\frac{\theta}{2}) & 0 & 0 & -i\exp^{-i2\phi}\sin(\frac{\theta}{2}) \\
+        \cos(\frac{\theta}{2}) & 0 & 0 & -ie^{-i2\phi}\sin(\frac{\theta}{2}) \\
         0 & \cos(\frac{\theta}{2}) & -i\sin(\frac{\theta}{2}) & 0 \\
         0 & -i\sin(\frac{\theta}{2}) & \cos(\frac{\theta}{2}) & 0 \\
-        -i\exp^{i2\phi}\sin(\frac{\theta}{2}) & 0 & 0 & \cos(\frac{\theta}{2})
+        -ie^{i2\phi}\sin(\frac{\theta}{2}) & 0 & 0 & \cos(\frac{\theta}{2})
         \end{pmatrix}
 
     Examples
@@ -895,7 +895,7 @@ def __init__(self, targets, arg_value, **kwargs):
         self.latex_str = r"{\rm MS}"
 
     def get_compact_qobj(self):
-        return molmer_sorensen(self.arg_value)
+        return molmer_sorensen(*self.arg_value)
 
 
 class TOFFOLI(Gate):

src/qutip_qip/operations/gates.py

@@ -805,7 +805,7 @@ def molmer_sorensen(theta, phi=0.0, N=None, targets=[0, 1]):
         )
 
     return Qobj(
-        [   
+        [
             [
                 np.cos(theta / 2),
                 0,
@@ -1117,7 +1117,6 @@ def qubit_clifford_group(N=None, target=0):
         partial(reduce, mul),
         product(_powers(E, 3), _powers(X, 2), _powers(S, 4)),
     ):
-
         # partial(reduce, mul) returns a function that takes products
         # of its argument, by analogy to sum. Note that by analogy,
         # sum can be written as partial(reduce, add).

tests/test_gates.py

@@ -219,7 +219,7 @@ def test_single_qubit_rotation(self, gate, n_angles):
         pytest.param(gates.swap, 0, id="swap"),
         pytest.param(gates.iswap, 0, id="iswap"),
         pytest.param(gates.sqrtswap, 0, id="sqrt(swap)"),
-        pytest.param(functools.partial(gates.molmer_sorensen, 0.5*np.pi), 0,
+        pytest.param(functools.partial(gates.molmer_sorensen, 0.5*np.pi, 0.), 0,
                      id="Molmer-Sorensen")
     ])
     def test_two_qubit(self, gate, n_controls):