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Fix a bug in EPG computation for devices with ECR gates (backport #1431) #1441

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Fix a bug in EPG computation for devices with ECR gates (backport #1431) #1441

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2 changes: 2 additions & 0 deletions docs/manuals/verification/randomized_benchmarking.rst
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Expand Up @@ -208,6 +208,8 @@ The EPGs of two-qubit RB are analyzed with the corrected EPC if available.

Note that ``EPC_corrected`` value is smaller than one of raw ``EPC``, which indicates
contribution of depolarization from single-qubit error channels.
If you don't need ``EPG`` value, you can skip its computation by
``exp_2q.analysis.set_options(gate_error_ratio=False)``.


Displaying the RB circuits
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1 change: 1 addition & 0 deletions qiskit_experiments/library/randomized_benchmarking/rb_analysis.py
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Expand Up @@ -324,6 +324,7 @@ def _lookup_epg_ratio(gate: str, n_qubits: int) -> Union[None, int]:
"cy": 1.0,
"cz": 1.0,
"ch": 1.0,
"ecr": 1.0,
"crx": 2.0,
"cry": 2.0,
"crz": 2.0,
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10 changes: 10 additions & 0 deletions releasenotes/notes/fix-ecr-epg-59c8db98494966b0.yaml
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@@ -0,0 +1,10 @@
---
fixes:
- |
Fixed a bug in EPG (error per gate) computation in :class:`~.RBAnalysis`
where it fails with a ``TypeError`` for backends with ECR gate
as a 2-qubit basis gate (e.g. IBM Eagle processors).
See
`#1419
<https://github.com/Qiskit-Extensions/qiskit-experiments/pull/1419>`_.
for the details of the bug.