This commit removes the qiskit aer translation plugin. This was added as a workaround for a Qiskit/qiskit#11351. This has been fixed in Qiskit since 0.45.2 and is no longer necessary. The mechanism by which the workaround worked was unsound in practice as it was mutating the target and also explicitly using private attributes of the Target. This is causing real issues now as it only worked by assuming the target wasn't shared between passmanagers which is never guaranteed. Similarly the reliance on internal private attributes of the Target class will cause issues in the future when the target internals change (see Qiskit/qiskit#12292). This commit opts to remove the plugin in its entirity as it's no longer necessary and actively causing issues with Qiskit 1.1 and transpiling targeting aer backends with >1 circuit. As it's private internal detail there isn't a release note.
Summary
This commit removes the qiskit aer translation plugin. This was added as a workaround for a Qiskit/qiskit#11351. This has been fixed in Qiskit since 0.45.2 and is no longer necessary. The mechanism by which the workaround worked was unsound in practice as it was mutating the target and also explicitly using private attributes of the Target. This is causing real issues now as it only worked by assuming the target wasn't shared between passmanagers which is never guaranteed. Similarly the reliance on internal private attributes of the Target class will cause issues in the future when the target internals change (see Qiskit/qiskit#12292). This commit opts to remove the plugin in its entirity as it's no longer necessary and actively causing issues with Qiskit 1.1 and transpiling targeting aer backends with >1 circuit. As it's private internal detail there isn't a release note.
Details and comments
Fixes Qiskit/qiskit#12425 Fixes #2141