Add unroll step to level2 passmanager optimization loop #5671
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This commit adds the basis translation step to the level 2 preset passmanager's optimization loop. The level 2 optimization loop runs the commutative cancellation pass which use Rx and U1 gates as part of it's optimization step which may not be in the target basis gates. This can result in a gate outside of the target basis ended up in the output. To avoid this in a general manner we need to rely on the basis translation step because we can't write a pass to do the simplified rotation in a manner compatible with any basis (especially since the target basis could be using custom gates). Fixes Qiskit#5644
mtreinish
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ajavadia
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Jan 21, 2021
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This commit adds the basis translation step to the level 2 preset passmanager's optimization loop. The level 2 optimization loop runs the commutative cancellation pass which use Rx and U1 gates as part of it's optimization step which may not be in the target basis gates. This can result in a gate outside of the target basis ended up in the output. To avoid this in a general manner we need to rely on the basis translation step because we can't write a pass to do the simplified rotation in a manner compatible with any basis (especially since the target basis could be using custom gates). Fixes #5644 (cherry picked from commit 25eb58a)
mergify bot
added a commit
that referenced
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Jan 22, 2021
This commit adds the basis translation step to the level 2 preset passmanager's optimization loop. The level 2 optimization loop runs the commutative cancellation pass which use Rx and U1 gates as part of it's optimization step which may not be in the target basis gates. This can result in a gate outside of the target basis ended up in the output. To avoid this in a general manner we need to rely on the basis translation step because we can't write a pass to do the simplified rotation in a manner compatible with any basis (especially since the target basis could be using custom gates). Fixes #5644 (cherry picked from commit 25eb58a) Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
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Summary
This commit adds the basis translation step to the level 2 preset
passmanager's optimization loop. The level 2 optimization loop runs the
commutative cancellation pass which use Rx and U1 gates as part of it's
optimization step which may not be in the target basis gates. This can
result in a gate outside of the target basis ended up in the output. To
avoid this in a general manner we need to rely on the basis translation
step because we can't write a pass to do the simplified rotation in a
manner compatible with any basis (especially since the target basis
could be using custom gates).
Details and comments
Fixes #5644