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merged 3 commits into from
Jul 28, 2025
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Default implementation of setup_execution_config uses "device" mcm #7968

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Default implementation of setup_execution_config uses "device" mcm
astralcai Jul 25, 2025
2f38b11
Merge branch 'master' of https://github.com/PennyLaneAI/pennylane int…
astralcai Jul 28, 2025
d9ea6c8
changelog
astralcai Jul 28, 2025
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3 changes: 3 additions & 0 deletions doc/releases/changelog-dev.md
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Expand Up @@ -142,6 +142,9 @@
* `default.qubit` will default to the tree-traversal MCM method when `mcm_method="device"`.
[(#7885)](https://github.com/PennyLaneAI/pennylane/pull/7885)

* The default implementation of `Device.setup_execution_config` now choses `"device"` as the default mcm method if it is available as specified by the device TOML file.
[(#7968)](https://github.com/PennyLaneAI/pennylane/pull/7968)

<h4>Resource-efficient decompositions 🔎</h4>

* With :func:`~.decomposition.enable_graph()`, dynamically allocated wires are now supported in decomposition rules. This provides a smoother overall experience when decomposing operators in a way that requires auxiliary/work wires.
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8 changes: 3 additions & 5 deletions pennylane/devices/device_api.py
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Expand Up @@ -1042,12 +1042,10 @@ def _default_mcm_method(capabilities: DeviceCapabilities, shots_present: bool) -
supports_one_shot = "one-shot" in capabilities.supported_mcm_methods
has_device_support = "device" in capabilities.supported_mcm_methods

# In finite shots mode, the one-shot method is the default even if there is device support.
# This is to ensure consistency with old behaviour. Although I'm not too sure about this.
if supports_one_shot and shots_present:
return "one-shot"

if has_device_support:
return "device"

if supports_one_shot and shots_present:
return "one-shot"

return "deferred"
2 changes: 1 addition & 1 deletion tests/devices/test_device_api.py
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Expand Up @@ -246,7 +246,7 @@ def execute(self, circuits, execution_config=DefaultExecutionConfig):
(EXAMPLE_TOML_FILE, None, "deferred"),
(EXAMPLE_TOML_FILE_ONE_SHOT, 10, "one-shot"),
(EXAMPLE_TOML_FILE_ONE_SHOT, None, "deferred"),
(EXAMPLE_TOML_FILE_ALL_SUPPORT, 10, "one-shot"),
(EXAMPLE_TOML_FILE_ALL_SUPPORT, 10, "device"),
(EXAMPLE_TOML_FILE_ALL_SUPPORT, None, "device"),
],
indirect=("create_temporary_toml_file",),
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