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Fix plot_error_map with BackendProperties set or BackendV2 #7880

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merged 4 commits into from
Apr 4, 2022
Merged

Fix plot_error_map with BackendProperties set or BackendV2 #7880

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1b66d25
Fix plot_error_map
mtreinish Apr 4, 2022
ab5aca1
Add tests for plot_error_map
mtreinish Apr 4, 2022
05f26ff
Merge branch 'main' into fix-plot-error-map
mtreinish Apr 4, 2022
f8b27eb
Add release note
mtreinish Apr 4, 2022
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21 changes: 13 additions & 8 deletions qiskit/visualization/gate_map.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@

from qiskit.exceptions import QiskitError
from qiskit.utils import optionals as _optionals
from qiskit.providers.exceptions import BackendPropertyError
from .exceptions import VisualizationError
from .utils import matplotlib_close_if_inline

Expand Down Expand Up @@ -910,14 +911,16 @@ def plot_error_map(backend, figsize=(12, 9), show_title=True, qubit_coordinates=

backend_version = _get_backend_interface_version(backend)
if backend_version <= 1:
backend_name = backend.name()
num_qubits = backend.configuration().n_qubits
cmap = backend.configuration().coupling_map
props = backend.properties().to_dict()
props = backend.properties()
props_dict = props.to_dict()
single_gate_errors = [0] * num_qubits
read_err = [0] * num_qubits
cx_errors = []
# sx error rates
for gate in props["gates"]:
for gate in props_dict["gates"]:
if gate["gate"] == "sx":
_qubit = gate["qubits"][0]
for param in gate["parameters"]:
Expand All @@ -937,16 +940,18 @@ def plot_error_map(backend, figsize=(12, 9), show_title=True, qubit_coordinates=
break

for line in cmap:
for item in props["gates"]:
for item in props_dict["gates"]:
if item["qubits"] == line:
cx_errors.append(item["parameters"][0]["value"])
break
for qubit in range(num_qubits):
for item in props["qubits"][qubit]:
if item["name"] == "readout_error":
read_err.append(item["value"])
try:
read_err[qubit] = props.readout_error(qubit)
except BackendPropertyError:
pass

else:
backend_name = backend.name
num_qubits = backend.num_qubits
cmap = backend.coupling_map
two_q_error_map = {}
Expand Down Expand Up @@ -977,7 +982,7 @@ def plot_error_map(backend, figsize=(12, 9), show_title=True, qubit_coordinates=
if not [edge[1], edge[0]] in cmap:
directed = True
break
for line in cmap:
for line in cmap.get_edges():
err = two_q_error_map.get(tuple(line), 0)
cx_errors.append(err)

Expand Down Expand Up @@ -1095,6 +1100,6 @@ def plot_error_map(backend, figsize=(12, 9), show_title=True, qubit_coordinates=
spine.set_visible(False)

if show_title:
fig.suptitle(f"{backend.name()} Error Map", fontsize=24, y=0.9)
fig.suptitle(f"{backend_name} Error Map", fontsize=24, y=0.9)
matplotlib_close_if_inline(fig)
return fig