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More Gecr Aliases #627

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Aug 5, 2025
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More Gecr Aliases #627

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7 changes: 5 additions & 2 deletions pygsti/tools/internalgates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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).
Expand Down Expand Up @@ -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()

Expand Down Expand Up @@ -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

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