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Creating a challenging backend to show the transpiler stochasticity (backport #12116) #12141

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Apr 4, 2024
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Creating a challenging backend to show the transpiler stochasticity (backport #12116) #12141

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10 changes: 7 additions & 3 deletions qiskit/transpiler/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -799,7 +799,7 @@
at the output.

In order to highlight this, we run a GHZ circuit 100 times, using a "bad" (disconnected)
`initial_layout`:
``initial_layout`` in a heavy hex coupling map:

.. plot::

Expand All @@ -816,18 +816,22 @@
import matplotlib.pyplot as plt
from qiskit import QuantumCircuit, transpile
from qiskit.providers.fake_provider import GenericBackendV2
backend = GenericBackendV2(16)
from qiskit.transpiler import CouplingMap

coupling_map = CouplingMap.from_heavy_hex(3)
backend = GenericBackendV2(coupling_map.size(), coupling_map=coupling_map)

ghz = QuantumCircuit(15)
ghz.h(0)
ghz.cx(0, range(1, 15))

depths = []
for _ in range(100):
for i in range(100):
depths.append(
transpile(
ghz,
backend,
seed_transpiler=i,
layout_method='trivial' # Fixed layout mapped in circuit order
).depth()
)
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