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Add descriptive docstring for _get_phases in CZLayerGate #467

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Merged
mhucka merged 2 commits into from
Apr 15, 2026
Merged

Add descriptive docstring for _get_phases in CZLayerGate #467

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c0af13b
Add descriptive docstring for _get_phases in CZLayerGate.
mhucka Mar 26, 2026
2f0aee3
Merge branch 'main' into add-docstring-get-phases-2613680561594846680
mhucka Apr 15, 2026
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9 changes: 8 additions & 1 deletion recirq/third_party/quaff/cz_layer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -144,7 +144,14 @@ def get_phase_poly(num_qubits, pairs):
return phase_poly % 4

def _get_phases(self):
"""TODO"""
"""Computes phase exponents for the single-qubit S gates in the decomposition.

Returns:
A tuple (linear, quadratic), where linear is a vector of exponents for
the initial single-qubit phase layer, and quadratic is a matrix where
each row s contains exponents for the single-qubit phase layer following
the s-th basis change stage.
"""
n = self.num_qubits()
phase_poly = self.phase_poly
quadratic = np.zeros((n // 2, n), dtype=linalg.DTYPE)
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