Qiskit / qiskit-ibm-provider
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LAST BUILD ON BRANCH refs/tags/0.7.2
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Enable support for 0.45.0rc1 with QPY version 9 (#757)

The qiskit-ibm-provider package maintains a fork of the QPY
serialization module from upstream qiskit. This is done primarily
because Qiskit only supports writing a single qpy format version per
release (whatever the most recent is). However, since the server side of
the ibm runtime version does not always support the latest QPY format
version immediately and tends to lag a bit behind what upstream Qiskit
is emitting. The fork in qiskit-ibm-provider is used to control the
QPY format version that is used for job submission so it ensure the
leading edge only moves as quickly as the server side is updated.
However, for the upcoming qiskit 0.45.0 release there were some internal
object model changes and the fork of qpy (which is a copy of the qpy
module from qiskit-terra 0.25.x/qiskit 0.44.x) is incompatible with
those changes. This results in errors during the serialization because
the qpy module is trying to serialize the circuit with assumptions of
the code that do not hold with the upcoming 0.45.0 release. To further
complicate matters qiskit 0.45.0 also introduced QPY version 10 which is
completely incompatible with version 9 being used by the ibm runtime
currently. This means the normal strategy of porting all the changes
from qiskit during the upcoming release to the provider isn't viable in
the short term, at least until the server side is updated to support QPY
version 10.

To address this compatibility in the short term, this commit is a partial
backport of the changes made in qiskit 0.45.0 to the qpy module, but only
those changes made to accomodate the internal qiskit changes during the
release. It's also done in a manner where it doesn't require the 0.45.0
release, so that the provider can be used with either qiskit 0.44.x and
0.45.0. However, this is only a short term solution, once the server side
is updated to support QPY we should use #736 and release a ne... (continued)

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6642303355 refs/tags/0.7.2 Enable support for 0.45.0rc1 with QPY version 9 (#757) The qiskit-ibm-provider package maintains a fork of the QPY serialization module from upstream qiskit. This is done primarily because Qiskit only supports writing a single qpy format versio... push web-flow github
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