Fix QPY serialisation of ControlledGate with open controls (backport #8571) #8578
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* Fix QPY serialisation of ControlledGate with open controls
Previously, an incorrect definition and name would be re-instated on
QPY deserialisation of a `ControlledGate` instance with open controls.
The base name would include the dynamic `_o{ctrl_state}` suffix, causing
the suffix to later be duplicated, and the definition would duplicate
the logic that added the open controls. This fixes both by stripping
the suffix on re-read before it is assigned, and serialising only the
"11...1" state definition, since this is what is required and stored by
`ControlledGate`.
* Add QPY backwards compatibility test
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
(cherry picked from commit a0964c1)
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jakelishman
approved these changes
Aug 18, 2022
jakelishman
added
Changelog: Bugfix
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This is an automatic backport of pull request #8571 done by Mergify.
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