Fix Windows builds

.github/workflows/build.yml

@@ -270,3 +270,71 @@ jobs:
           name: pennylane_qrack-${{ matrix.platform }}
           path: dist/
 
+  build_windows:
+    runs-on: windows-latest  # Use a Linux runner
+    strategy:
+      matrix:
+        platform:
+          - win-amd64
+        dependencies: [vcpkg]
+    steps:
+      - name: Checkout PennyLane-Qrack
+        uses: actions/checkout@v4
+
+      - name: Checkout Qrack
+        uses: actions/checkout@v4
+        with:
+          repository: 'unitaryfund/qrack'
+          path: qrack
+
+      - name: Checkout Catalyst
+        uses: actions/checkout@v4
+        with:
+          repository: 'PennyLaneAI/catalyst'
+          path: catalyst
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install Python Dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install wheel setuptools pybind11
+
+      - name: Install vcpkg dependencies
+        run: |
+          vcpkg install opencl
+
+      - name: Build Qrack Windows x86-64
+        run: |
+          cd qrack
+          mkdir build
+          cd build
+          powershell -c "Invoke-WebRequest -Uri 'https://github.com/ckormanyos/xxd/releases/download/v1.1/xxd-win64-msvc.zip' -OutFile 'xxd-win64-msvc.zip'"
+          powershell -c "Expand-Archive -Path xxd-win64-msvc.zip -DestinationPath ."
+          cmake .. -DCMAKE_TOOLCHAIN_FILE="C:/vcpkg/scripts/buildsystems/vcpkg.cmake" -DXXD_BIN="xxd.exe" -DQBCAPPOW=12 -DCPP_STD=14
+          cmake --build . --config Release --target install
+
+      - name: Build Catalyst Windows x86-64
+        run: |
+          powershell -c "Invoke-WebRequest -Uri 'https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-win.zip' -OutFile 'ninja-win.zip'"
+          powershell -c "Expand-Archive -Path ninja-win.zip -DestinationPath ."
+          set PATH=%PATH%;${GITHUB_WORKSPACE}
+          cd catalyst
+          git submodule update --init --depth=1
+          pip install -r requirements.txt
+          make all
+
+      - name: Build Wheel
+        run: |
+          pip install -r requirements.txt
+          pip install .
+          python setup.py bdist_wheel
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: pennylane_qrack-${{ matrix.platform }}
+          path: dist/
+