Drop Python 3.11 in CI

.github/workflows/build-wheel-linux-arm64.yaml

@@ -292,7 +292,7 @@ jobs:
       uses: actions/cache/restore@v4
       with:
         path: ${{ github.workspace }}/llvm-build
-        key: ${{ matrix.container_img }}-llvm-${{ needs.constants.outputs.llvm_version }}-3.11-wheel-build
+        key: ${{ matrix.container_img }}-llvm-${{ needs.constants.outputs.llvm_version }}-3.12-wheel-build
         fail-on-cache-miss: True
 
     - name: Get Cached Stablehlo Source

.github/workflows/build-wheel-linux-x86_64.yaml

@@ -314,7 +314,7 @@ jobs:
       uses: actions/cache/restore@v4
       with:
         path: ${{ github.workspace }}/llvm-build
-        key: ${{ matrix.container_img }}-llvm-${{ needs.constants.outputs.llvm_version }}-3.11-wheel-build
+        key: ${{ matrix.container_img }}-llvm-${{ needs.constants.outputs.llvm_version }}-3.12-wheel-build
         fail-on-cache-miss: True
 
     - name: Get Cached Stablehlo Source

.github/workflows/build-wheel-macos-arm64.yaml

@@ -168,9 +168,9 @@ jobs:
         lookup-only: True
 
     - name: Setup Python version
-      # There are multiple Python versions installed on the GitHub image, 3.11 - 3.14 is already
+      # There are multiple Python versions installed on the GitHub image, 3.12 - 3.14 is already
       # available under /Library/Frameworks/Python.framework/Versions/, but homebrew also provides
-      # 3.11 - 3.14. Make sure to consistently use the system versions.
+      # 3.12 - 3.14. Make sure to consistently use the system versions.
       run: |
         echo /Library/Frameworks/Python.framework/Versions/${{ matrix.python_version }}/bin >> $GITHUB_PATH
 
@@ -247,9 +247,9 @@ jobs:
         ref: ${{ inputs.branch || github.ref }}
 
     - name: Setup Python version
-      # There are multiple Python versions installed on the GitHub image, 3.11 - 3.14 is already
+      # There are multiple Python versions installed on the GitHub image, 3.12 - 3.14 is already
       # available under /Library/Frameworks/Python.framework/Versions/, but homebrew also provides
-      # 3.11 - 3.14. Make sure to consistently use the system versions.
+      # 3.12 - 3.14. Make sure to consistently use the system versions.
       run: |
         echo /Library/Frameworks/Python.framework/Versions/${{ matrix.python_version }}/bin >> $GITHUB_PATH
 
@@ -461,9 +461,9 @@ jobs:
         path: ${{ github.workspace }}/standalone_plugin_wheel/wheel
 
     - name: Setup Python version
-      # There are multiple Python versions installed on the GitHub image, 3.11 - 3.14 is already
+      # There are multiple Python versions installed on the GitHub image, 3.12 - 3.14 is already
       # available under /Library/Frameworks/Python.framework/Versions/, but homebrew also provides
-      # 3.11 - 3.14. Make sure to consistently use the system versions.
+      # 3.12 - 3.14. Make sure to consistently use the system versions.
       run: |
         echo /Library/Frameworks/Python.framework/Versions/${{ matrix.python_version }}/bin >> $GITHUB_PATH
 

.github/workflows/constants.yaml

@@ -83,17 +83,17 @@ jobs:
       - name: Python versions
         id: python_versions
         run: |
-          echo 'python_versions=["3.11", "3.12"]' >> $GITHUB_OUTPUT
+          echo 'python_versions=["3.12"]' >> $GITHUB_OUTPUT
 
       - name: Python test versions
         id: python_test_versions
         run: |
-          echo 'python_test_versions=["3.11", "3.12", "3.13", "3.14"]' >> $GITHUB_OUTPUT
+          echo 'python_test_versions=["3.12", "3.13", "3.14"]' >> $GITHUB_OUTPUT
 
       - name: Primary Python version
         id: primary_python_version
         run: |
-          echo 'primary_python_version=3.11' >> $GITHUB_OUTPUT
+          echo 'primary_python_version=3.12' >> $GITHUB_OUTPUT
 
       - name: Get last build python version for forward compatibility
         id: forward_compat_python_version

.readthedocs.yaml

@@ -19,7 +19,7 @@ formats:
 build:
   os: ubuntu-24.04
   tools:
-      python: "3.11"
+      python: "3.12"
   apt_packages:
     - graphviz
     - cmake

frontend/test/pytest/python_interface/test_unified_compiler.py

@@ -107,7 +107,7 @@ def test_generic_catalyst_program(as_mod):
             }) {transform.with_named_sequence} : () -> ()
             "func.func"() <{function_type = () -> tensor<2xcomplex<f64>>, sym_name = "circuit", sym_visibility = "public"}> ({
               %0 = "arith.constant"() <{value = 0 : i64}> : () -> i64
-              "quantum.device"(%0) <{kwargs = "{'shots': 0, 'mcmc': False, 'num_burnin': 0, 'kernel_name': None}", lib = "/usr/local/lib/python3.11/dist-packages/pennylane_lightning/liblightning_qubit_catalyst.so", device_name = "LightningSimulator"}> : (i64) -> ()
+              "quantum.device"(%0) <{kwargs = "{'shots': 0, 'mcmc': False, 'num_burnin': 0, 'kernel_name': None}", lib = "/usr/local/lib/python3.12/dist-packages/pennylane_lightning/liblightning_qubit_catalyst.so", device_name = "LightningSimulator"}> : (i64) -> ()
               %1 = "quantum.alloc"() <{nqubits_attr = 1 : i64}> : () -> !quantum.reg
               %2 = "quantum.extract"(%1) <{idx_attr = 0 : i64}> : (!quantum.reg) -> !quantum.bit
               %3 = "quantum.custom"(%2) <{gate_name = "Hadamard", operandSegmentSizes = array<i32: 0, 1, 0, 0>, resultSegmentSizes = array<i32: 1, 0>}> : (!quantum.bit) -> !quantum.bit