deepcopy

Qiskit · Oct 16, 2023 · 1a375df · 1a375df
1 parent 1e52ac8
commit 1a375df
Showing 1 changed file with 5 additions and 6 deletions.
diff --git a/qiskit/transpiler/passes/layout/noise_adaptive_layout.py b/qiskit/transpiler/passes/layout/noise_adaptive_layout.py
@@ -13,7 +13,7 @@
 """Choose a noise-adaptive Layout based on current calibration data for the backend."""
 
 import math
-
+from copy import deepcopy
 import rustworkx as rx
 
 from qiskit.transpiler.layout import Layout
@@ -73,21 +73,20 @@ def __init__(self, backend_prop, coupling_map=None):
             self.backend_prop = target_to_backend_properties(self.target)
         else:
             self.target = None
-            self.backend_prop = backend_prop
 
             if coupling_map:
                 # A backend might have more properties than qubits/gates in the configuration. This is a
                 # problem that the Target path should handle differently (by solving that possible
                 # inconsistency internally). For the non-target path, this is a possible solution.
                 # See https://github.com/Qiskit/qiskit/issues/7677
+                backend_prop = deepcopy(backend_prop)
                 edge_set = set(coupling_map.graph.edge_list())
-                self.backend_prop.gates = filter(
+                backend_prop.gates = filter(
                     lambda ginfo: tuple(ginfo.qubits) in edge_set,
                     backend_prop.gates,
                 )
-                self.backend_prop.qubits = backend_prop.qubits[
-                    : 1 + max(coupling_map.physical_qubits)
-                ]
+                backend_prop.qubits = backend_prop.qubits[: 1 + max(coupling_map.physical_qubits)]
+            self.backend_prop = backend_prop
 
         self.swap_graph = rx.PyDiGraph()
         self.cx_reliability = {}