Merge pull request #627 from sandialabs/more-gecr-aliases

More Gecr Aliases

Author: rileyjmurray

pygsti/tools/internalgates.py

@@ -196,7 +196,8 @@ def standard_gatename_unitaries():
       * 'Gsqrtiswap' : square-root of ISWAP gate, used in some superconducting qubit platforms.
       * 'Gxx', 'Gzz' : MS-style parity gates
       * 'Gcres', 'Gecres' : Cross-resonance and echoed cross-resonance gates. Native gate operations common on transmon systems (including IBM).
-      
+      * 'Gecr' : alternative name for the echoed cross-resonance gate, matching OpenQASM / IBM conventions.
+
     * Non-Clifford gates:
 
       * 'Gt', 'Gtdag' : the T and inverse T gates (T is a Z rotation by pi/4).
@@ -302,7 +303,8 @@ def u_op(exp):
     std_unitaries['Gcres'] = _spl.expm(-1j*_np.pi/4*sigmaxz)
     std_unitaries['Gecres'] = _np.array([[0, 1, 0., 1j], [1., 0, -1j, 0.],
                                         [0., 1j, 0, 1], [-1j, 0., 1, 0]], complex)/_np.sqrt(2)
-
+    std_unitaries['Gecr'] = std_unitaries['Gecres']  # alias
+    
     std_unitaries['Gzr'] = Gzr()
     std_unitaries['Gczr'] = Gczr()
 
@@ -403,6 +405,7 @@ def standard_gatenames_stim_conversions():
     ecr_unitary = _np.array([[0, 1, 0., 1j], [1., 0, -1j, 0.],
                              [0., 1j, 0, 1], [-1j, 0., 1, 0]], complex)/_np.sqrt(2)
     gate_dict['Gecres'] = stim.Tableau.from_unitary_matrix(ecr_unitary, endian='big')
+    gate_dict['Gecr'] = gate_dict['Gecres']
 
     return gate_dict