Merge branch 'master' into kitaev_model

.github/workflows/docs.yml

@@ -22,7 +22,6 @@ on:
       - reopened
       - synchronize
       - ready_for_review
-      - labeled
 
 jobs:
   sphinx:

.github/workflows/format.yml

@@ -6,7 +6,6 @@ on:
       - reopened
       - synchronize
       - ready_for_review
-      - labeled
 
 jobs:
   black-pylint:
@@ -22,7 +21,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Install dependencies
         run: pip install black pylint==2.7.4 isort==5.13.2
@@ -31,13 +30,13 @@ jobs:
 
       - name: Run Black
         run: |
-          black -t py39 -t py310 -t py311 -l 100 pennylane/ --check
-          black -t py39 -t py310 -t py311 -l 100 tests/ --check
+          black -t py310 -t py311 -t py312 -l 100 pennylane/ --check
+          black -t py310 -t py311 -t py312 -l 100 tests/ --check
 
       - name: Run isort
         run: |
-          isort --py 311 --profile black -l 100 -o autoray -p ./pennylane --skip __init__.py --filter-files ./pennylane --check
-          isort --py 311 --profile black -l 100 -o autoray -p ./pennylane --skip __init__.py --filter-files ./tests --check
+          isort --py 312 --profile black -l 100 -o autoray -p ./pennylane --skip __init__.py --filter-files ./pennylane --check
+          isort --py 312 --profile black -l 100 -o autoray -p ./pennylane --skip __init__.py --filter-files ./tests --check
 
       - name: Run Pylint (source files)
         if: always()

.github/workflows/install_deps/action.yml

@@ -7,31 +7,31 @@ inputs:
   python_version:
     description: The version of Python to use in order to run unit tests
     required: false
-    default: '3.9'
+    default: '3.10'
   install_jax:
     description: Indicate if JAX should be installed or not
     required: false
     default: 'true'
   jax_version:
     description: The version of JAX to install for any job that requires JAX
     required: false
-    default: 0.4.23
+    default: '0.4.23'
   install_tensorflow:
     description: Indicate if TensorFlow should be installed or not
     required: false
     default: 'true'
   tensorflow_version:
     description: The version of TensorFlow to install for any job that requires TensorFlow
     required: false
-    default: 2.16.0
+    default: '2.16.0'
   install_pytorch:
     description: Indicate if PyTorch should be installed or not
     required: false
     default: 'true'
   pytorch_version:
     description: The version of PyTorch to install for any job that requires PyTorch
     required: false
-    default: 2.3.0
+    default: '2.3.0'
   install_pennylane_lightning_master:
     description: Indicate if PennyLane-Lightning should be installed from the master branch
     required: false

.github/workflows/interface-unit-tests.yml

@@ -25,7 +25,7 @@ on:
           Indicate if a lightened version of the CI should be run instead of the entire suite.
 
           The lightened version of the CI includes the following changes:
-          - Only Python 3.9 is tested against, instead of 3.9, 3.10, 3.11, 3.12
+          - Only Python 3.10 is tested against, instead of 3.10, 3.11, 3.12
         required: false
         type: boolean
         default: false
@@ -63,23 +63,23 @@ jobs:
           then
             cat >python_versions.json <<-EOF
           {
-            "default": ["3.9"]
+            "default": ["3.10"]
           }
           EOF
           else
             cat >python_versions.json <<-EOF
           {
-            "default": ["3.9", "3.10", "3.11", "3.12"],
-            "torch-tests": ["3.9", "3.11"],
-            "tf-tests": ["3.9", "3.11"],
-            "jax-tests": ["3.9", "3.12"],
-            "all-interfaces-tests": ["3.9"],
-            "external-libraries-tests": ["3.9"],
-            "qcut-tests": ["3.9"],
-            "qchem-tests": ["3.9"],
-            "gradients-tests": ["3.9"],
-            "data-tests": ["3.9", "3.10"],
-            "device-tests": ["3.9"]
+            "default": ["3.10", "3.11", "3.12"],
+            "torch-tests": ["3.10", "3.12"],
+            "tf-tests": ["3.10", "3.12"],
+            "jax-tests": ["3.10", "3.12"],
+            "all-interfaces-tests": ["3.10"],
+            "external-libraries-tests": ["3.10"],
+            "qcut-tests": ["3.10"],
+            "qchem-tests": ["3.10"],
+            "gradients-tests": ["3.10"],
+            "data-tests": ["3.10"],
+            "device-tests": ["3.10"]
           }
           EOF
           fi
@@ -379,8 +379,7 @@ jobs:
       # catalyst requires the latest version of pennylane that is about to be released.
       # Installing catalyst after pennylane to make sure that the latest catalyst is used.
       install_catalyst_nightly: true
-      # using lightning master does not work for the tests with external libraries
-      install_pennylane_lightning_master: false
+      install_pennylane_lightning_master: true
       pytest_coverage_flags: ${{ inputs.pytest_coverage_flags }}
       pytest_markers: external
       additional_pip_packages: pyzx matplotlib stim quimb mitiq pennylane-qiskit ply
@@ -508,7 +507,7 @@ jobs:
     with:
       job_name: data-tests (${{ matrix.python-version }})
       branch: ${{ inputs.branch }}
-      coverage_artifact_name: data-coverage
+      coverage_artifact_name: data-coverage-${{ matrix.python-version }}
       python_version: ${{ matrix.python-version }}
       pipeline_mode: ${{ inputs.pipeline_mode }}
       install_jax: false

.github/workflows/tests-gpu.yml

@@ -9,14 +9,13 @@ on:
       - reopened
       - synchronize
       - ready_for_review
-      - labeled
 
 concurrency:
   group: gpu-test-${{ github.ref }}
   cancel-in-progress: true
 
 env:
-  TORCH_VERSION: 2.2.0
+  TORCH_VERSION: 2.3.0
 
 jobs:
   gpu-tests:
@@ -40,9 +39,9 @@ jobs:
       max-parallel: 2
       matrix:
         python-version:
-          - 3.9
           - '3.10'
           - '3.11'
+          - '3.12'
 
     env:
       SUITE: gpu

.github/workflows/tests.yml

@@ -9,7 +9,6 @@ on:
       - reopened
       - synchronize
       - ready_for_review
-      - labeled
   # Scheduled trigger on Monday at 2:47am UTC
   schedule:
   - cron: '47 2 * * 1'

.github/workflows/unit-test.yml

@@ -23,7 +23,7 @@ on:
         description: The version of Python to use in order to run unit tests
         required: false
         type: string
-        default: '3.9'
+        default: '3.10'
       pipeline_mode:
         description: The pipeline mode can be unit-tests, benchmarks, or reference-benchmark
         required: false

.github/workflows/upload.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Build PennyLane wheel
         run: |

.gitignore

@@ -27,3 +27,5 @@ config.toml
 qml_debug.log
 datasets/*
 .benchmarks/*
+*.h5
+*.hdf5

.readthedocs.yml

@@ -8,7 +8,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.9"
+    python: "3.10"
   apt_packages:
     - graphviz
 

Makefile

@@ -60,12 +60,10 @@ clean-docs:
 
 test:
 	$(PYTHON) $(TESTRUNNER)
-	$(PYTHON) $(PLUGIN_TESTRUNNER) --device=default.qubit.autograd
 
 coverage:
 	@echo "Generating coverage report..."
 	$(PYTHON) $(TESTRUNNER) $(COVERAGE)
-	$(PYTHON) $(PLUGIN_TESTRUNNER) --device=default.qubit.autograd $(COVERAGE) --cov-append
 
 .PHONY:format
 format:

README.md

@@ -67,7 +67,7 @@
 
 ## Installation
 
-PennyLane requires Python version 3.9 and above. Installation of PennyLane, as well as all
+PennyLane requires Python version 3.10 and above. Installation of PennyLane, as well as all
 dependencies, can be done using pip:
 
 ```console

doc/development/deprecations.rst

@@ -9,17 +9,18 @@ deprecations are listed below.
 Pending deprecations
 --------------------
 
-* All of the legacy devices (any with the name ``default.qubit.{autograd,torch,tf,jax,legacy}``) are deprecated. Use ``default.qubit`` instead,
-  as it supports backpropagation for the many backends the legacy devices support.
+* ``Device``, ``QubitDevice``, and ``QutritDevice`` will no longer be imported top level in v0.40.  They instead
+  we be available as ``qml.devices.LegacyDevice``, ``qml.devices.QubitDevice``, and ``qml.devices.QutritDevice``
+  respectively.
 
-  - Deprecated in v0.38
-  - Will be removed in v0.39
+  - Deprecated top level access in v0.39
+  - Top level access removed in v0.40
 
-* The logic for internally switching a device for a different backpropagation
-  compatible device is now deprecated, as it was in place for the deprecated ``default.qubit.legacy``.
+* `QNode.gradient_fn` is deprecated. Please use `QNode.diff_method` instead. `QNode.get_gradient_fn` can also be used to
+  process the diff method.
 
-  - Deprecated in v0.38
-  - Will be removed in v0.39  
+  - Deprecated in v0.39
+  - Will be removed in v0.40
 
 * The ``decomp_depth`` argument in ``qml.device`` is deprecated. 
 
@@ -82,6 +83,23 @@ Other deprecations
 Completed deprecation cycles
 ----------------------------
 
+* All of the legacy devices (any with the name ``default.qubit.{autograd,torch,tf,jax,legacy}``) are removed. Use ``default.qubit`` instead,
+  as it supports backpropagation for the many backends the legacy devices support.
+
+  - Deprecated in v0.38
+  - Removed in v0.39
+
+* The logic for internally switching a device for a different backpropagation
+  compatible device is removed, as it was in place for removed ``default.qubit.legacy``.
+
+  - Deprecated in v0.38
+  - Removed in v0.39
+
+* `Operator.expand` is now removed. Use `qml.tape.QuantumScript(op.deocomposition())` instead.
+
+  - Deprecated in v0.38
+  - Removed in v0.39
+
 * The ``expansion_strategy`` attribute of ``qml.QNode`` is removed.
   Users should make use of ``qml.workflow.construct_batch``, should they require fine control over the output tape(s).
 

doc/development/guide/logging.rst

@@ -298,7 +298,7 @@ process, and surrounding operations:
 
    # Get logger for use by this script only.
    logger = logging.getLogger(__name__)
-   dev_name = "default.qubit.jax"
+   dev_name = "default.qubit"
    num_wires = 2
    num_shots = None
 

doc/development/release_notes.md

@@ -5,6 +5,8 @@ This page contains the release notes for PennyLane.
 
 .. mdinclude:: ../releases/changelog-dev.md
 
+.. mdinclude:: ../releases/changelog-0.38.1.md
+
 .. mdinclude:: ../releases/changelog-0.38.0.md
 
 .. mdinclude:: ../releases/changelog-0.37.0.md

doc/introduction/interfaces/jax.rst

@@ -54,7 +54,7 @@ a JAX-capable QNode in PennyLane. Simply specify the ``interface='jax'`` keyword
 
 .. code-block:: python
 
-    dev = qml.device('default.qubit.jax', wires=2)
+    dev = qml.device('default.qubit', wires=2)
 
     @qml.qnode(dev, interface='jax')
     def circuit1(phi, theta):
@@ -85,7 +85,7 @@ For example:
 
 .. code-block:: python
 
-    dev = qml.device('default.qubit.jax', wires=2)
+    dev = qml.device('default.qubit', wires=2)
 
     @qml.qnode(dev, interface='jax')
     def circuit3(phi, theta):
@@ -119,7 +119,7 @@ the ``@jax.jit`` decorator can be directly applied to the QNode.
 
 .. code-block:: python
 
-    dev = qml.device('default.qubit.jax', wires=2)
+    dev = qml.device('default.qubit', wires=2)
 
     @jax.jit  # QNode calls will now be jitted, and should run faster.
     @qml.qnode(dev, interface='jax')
@@ -176,7 +176,7 @@ Example:
 
         # Device construction should happen inside a `jax.jit` decorated
         # method when using a PRNGKey.
-        dev = qml.device('default.qubit.jax', wires=2, prng_key=key, shots=100)
+        dev = qml.device('default.qubit', wires=2, prng_key=key, shots=100)
 
 
         @qml.qnode(dev, interface='jax', diff_method=None)

doc/releases/changelog-0.38.0.md

@@ -1,6 +1,6 @@
 :orphan:
 
-# Release 0.38.0 (current release)
+# Release 0.38.0
 
 <h3>New features since last release</h3>
 

doc/releases/changelog-0.38.1.md

@@ -0,0 +1,14 @@
+:orphan:
+
+# Release 0.38.1 (current release)
+
+<h3>Bug fixes 🐛</h3>
+
+* Fix float-to-complex casting in various places across PennyLane.
+ [(#6260)](https://github.com/PennyLaneAI/pennylane/pull/6260)
+
+<h3>Contributors ✍️</h3>
+
+This release contains contributions from (in alphabetical order):
+
+Mudit Pandey