Signal Processing with Classical Bits

[d1ssk]

Before submitting, please check the following:

• Make sure you have tests for the new code and that test passes (run tox)
• format added code by black -l 120 <filename>
• If applicable, add a line to the [unreleased] part of CHANGELOG.md, following keep-a-changelog.

Then, please fill in below:

Context (if applicable):
Previously, when a node has corrections from multiple nodes, gate operations according to the measurement results were applied for each correction node individually. In the new version of Qiskit (> 1.0), the capabilities of classical expressions have been enhanced, allowing for signal processing at the classical bit level. It is preferable to perform XOR processing on multiple signals using classical bits and then apply the gate operation only once based on the result.

Description of the change:

• Modified the implementation of signal_process function in the IBMQ backend so that it uses Qiskit’s classical expressions for signal processing.
• Made revisions to match the specification changes of pattern in graphix.

Related issue:

also see that checks (github actions) pass.
If lint check keeps failing, try installing black==22.8.0 as behavior seems to vary across versions.