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Fix TwoQubitWeylDecomposition docstring #12022

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Mar 15, 2024
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Fix TwoQubitWeylDecomposition docstring #12022

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10 changes: 3 additions & 7 deletions qiskit/synthesis/two_qubit/two_qubit_decompose.py
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Expand Up @@ -118,13 +118,9 @@ class TwoQubitWeylDecomposition:

\pi /4 \geq a \geq b \geq |c|

This is an abstract factory class that instantiates itself as specialized subclasses based on
the fidelity, such that the approximation error from specialization has an average gate fidelity
at least as high as requested. The specialized subclasses have unique canonical representations
thus avoiding problems of numerical stability.

Passing non-None fidelity to specializations is treated as an assertion, raising QiskitError if
forcing the specialization is more approximate than asserted.
This class avoids some problems of numerical instability near high-symmetry loci within the Weyl
chamber. If there is a high-symmetry gate "nearby" (in terms of the requested average gate fidelity),
then it return a canonicalized decomposition of that high-symmetry gate.

References:
1. Cross, A. W., Bishop, L. S., Sheldon, S., Nation, P. D. & Gambetta, J. M.,
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