diff --git a/.github/workflows/downstream.yml b/.github/workflows/downstream.yml
new file mode 100644
index 0000000..460fe46
--- /dev/null
+++ b/.github/workflows/downstream.yml
@@ -0,0 +1,179 @@
+# Copyright (c) 2023 - 2025 Chair for Design Automation, TUM
+# Copyright (c) 2025 Munich Quantum Software Company GmbH
+# All rights reserved.
+#
+# SPDX-License-Identifier: MIT
+#
+# Licensed under the MIT License
+
+name: Downstream Tests
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  merge_group:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  downstream-cpp-test:
+    strategy:
+      matrix:
+        package:
+          - { user: munich-quantum-toolkit, repo: core, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qcec, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qmap, setup-z3: true }
+          - { user: cda-tum, repo: mqt-ddsim, setup-z3: false }
+    name: ${{ matrix.package.user }}/${{ matrix.package.repo }} • 🇨‌ • CI
+    permissions:
+      contents: read
+    uses: ./.github/workflows/reusable-cpp-ci.yml
+    with:
+      repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+      setup-z3: ${{ matrix.package.setup-z3 }}
+      # enable running on all supported combinations
+      enable-ubuntu2404-gcc-release: true
+      enable-ubuntu2404-arm-gcc-release: true
+      enable-macos13-clang-release: true
+      enable-macos14-clang-release: true
+      enable-windows2022-msvc-release: true
+      enable-ubuntu2404-gcc-debug: true
+      enable-ubuntu2404-clang-release: true
+      enable-ubuntu2404-clang-debug: true
+      enable-ubuntu2204-gcc-release: true
+      enable-ubuntu2204-gcc-debug: true
+      enable-ubuntu2204-clang-release: true
+      enable-ubuntu2204-clang-debug: true
+      enable-ubuntu2404-arm-gcc-debug: true
+      enable-ubuntu2404-arm-clang-release: true
+      enable-ubuntu2404-arm-clang-debug: true
+      enable-ubuntu2204-arm-gcc-release: true
+      enable-ubuntu2204-arm-gcc-debug: true
+      enable-ubuntu2204-arm-clang-release: true
+      enable-ubuntu2204-arm-clang-debug: true
+      enable-macos13-clang-debug: true
+      enable-macos13-gcc-release: true
+      enable-macos13-gcc-debug: true
+      enable-macos14-clang-debug: true
+      enable-macos14-gcc-release: true
+      enable-macos14-gcc-debug: true
+      enable-macos15-clang-release: true
+      enable-macos15-clang-debug: true
+      enable-macos15-gcc-release: true
+      enable-macos15-gcc-debug: true
+      enable-windows2022-msvc-debug: true
+      enable-windows2022-clang-release: true
+      enable-windows2022-clang-debug: true
+      enable-windows2025-msvc-release: true
+      enable-windows2025-msvc-debug: true
+      enable-windows2025-clang-release: true
+      enable-windows2025-clang-debug: true
+
+  downstream-python-test:
+    strategy:
+      matrix:
+        package:
+          - { user: munich-quantum-toolkit, repo: core, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qcec, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qmap, setup-z3: true }
+          - { user: cda-tum, repo: mqt-ddsim, setup-z3: false }
+          - { user: cda-tum, repo: mqt-bench, setup-z3: false }
+    name: ${{ matrix.package.user }}/${{ matrix.package.repo }} • 🐍‌ • CI
+    permissions:
+      contents: read
+      id-token: write
+    uses: ./.github/workflows/reusable-python-ci.yml
+    with:
+      repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+      setup-z3: ${{ matrix.package.setup-z3 }}
+      upload-coverage: false
+      # enable running on all supported combinations
+      enable-ubuntu2404: true
+      enable-ubuntu2204: true
+      enable-ubuntu2404-arm: true
+      enable-ubuntu2204-arm: true
+      enable-macos13: true
+      enable-macos14: true
+      enable-macos15: true
+      enable-windows2022: true
+      enable-windows2025: true
+      # testing Python on Windows 11 ARM is not supported by the ecosystem at the moment
+      enable-windows11-arm: false
+
+  downstream-python-linter:
+    strategy:
+      matrix:
+        package:
+          - { user: munich-quantum-toolkit, repo: core, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qcec, setup-z3: false }
+          - { user: cda-tum, repo: mqt-qmap, setup-z3: true }
+          - { user: cda-tum, repo: mqt-ddsim, setup-z3: false }
+          - { user: cda-tum, repo: mqt-bench, setup-z3: false }
+    name: ${{ matrix.package.user }}/${{ matrix.package.repo }} • 🐍‌ • Lint
+    permissions:
+      contents: read
+    uses: ./.github/workflows/reusable-python-linter.yml
+    with:
+      repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+      setup-z3: ${{ matrix.package.setup-z3 }}
+
+  downstream-python-packaging:
+    strategy:
+      matrix:
+        package:
+          - {
+              user: munich-quantum-toolkit,
+              repo: core,
+              setup-z3: false,
+              pure-python: false,
+            }
+          - {
+              user: cda-tum,
+              repo: mqt-qcec,
+              setup-z3: false,
+              pure-python: false,
+            }
+          - {
+              user: cda-tum,
+              repo: mqt-qmap,
+              setup-z3: true,
+              pure-python: false,
+            }
+          - {
+              user: cda-tum,
+              repo: mqt-ddsim,
+              setup-z3: false,
+              pure-python: false,
+            }
+          - {
+              user: cda-tum,
+              repo: mqt-bench,
+              setup-z3: false,
+              pure-python: true,
+            }
+    name: ${{ matrix.package.user }}/${{ matrix.package.repo }} • 🐍‌ • Packaging
+    permissions:
+      contents: read
+    uses: ./.github/workflows/reusable-python-packaging.yml
+    with:
+      repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+      upload-artifacts: false
+      setup-z3: ${{ matrix.package.setup-z3 }}
+      pure-python: ${{ matrix.package.pure-python }}
+      # enable running on all supported combinations
+      enable-ubuntu2404: true
+      enable-ubuntu2404-arm: true
+      enable-macos13: true
+      enable-macos14: true
+      enable-windows2022: true
+      # disable commonly unused runners for packaging
+      enable-ubuntu2204: true
+      enable-ubuntu2204-arm: true
+      enable-macos15: false
+      enable-windows2025: false
+      # Only select MQT packages currently support packaging on Windows 11 ARM
+      enable-windows11-arm: false
diff --git a/.github/workflows/reusable-cpp-ci.yml b/.github/workflows/reusable-cpp-ci.yml
index 08c6804..87183ae 100644
--- a/.github/workflows/reusable-cpp-ci.yml
+++ b/.github/workflows/reusable-cpp-ci.yml
@@ -11,6 +11,12 @@ on:
   workflow_call:
     inputs:
       ###---- General inputs ----------------------------------------------------------------------------------------###
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
       cmake-args:
         description: >
           Additional arguments to pass to CMake on every OS. Defaults to an empty string.
@@ -386,6 +392,7 @@ jobs:
       fail-fast: false
     uses: ./.github/workflows/reusable-cpp-tests-ubuntu.yml
     with:
+      repository: ${{ inputs.repository }}
       runs-on: ${{ matrix.runs-on }}
       compiler: ${{ matrix.compiler }}
       config: ${{ matrix.config }}
@@ -403,6 +410,7 @@ jobs:
       fail-fast: false
     uses: ./.github/workflows/reusable-cpp-tests-macos.yml
     with:
+      repository: ${{ inputs.repository }}
       runs-on: ${{ matrix.runs-on }}
       compiler: ${{ matrix.compiler }}
       config: ${{ matrix.config }}
@@ -420,6 +428,7 @@ jobs:
       fail-fast: false
     uses: ./.github/workflows/reusable-cpp-tests-windows.yml
     with:
+      repository: ${{ inputs.repository }}
       runs-on: ${{ matrix.runs-on }}
       compiler: ${{ matrix.compiler }}
       config: ${{ matrix.config }}
diff --git a/.github/workflows/reusable-cpp-tests-macos.yml b/.github/workflows/reusable-cpp-tests-macos.yml
index ac29875..29550a3 100644
--- a/.github/workflows/reusable-cpp-tests-macos.yml
+++ b/.github/workflows/reusable-cpp-tests-macos.yml
@@ -10,6 +10,12 @@ name: 🇨 • Tests • macos
 on:
   workflow_call:
     inputs:
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
       runs-on:
         description: >
           The macOS runner image to use. Defaults to 'macos-latest'.
@@ -57,6 +63,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3
diff --git a/.github/workflows/reusable-cpp-tests-ubuntu.yml b/.github/workflows/reusable-cpp-tests-ubuntu.yml
index 53911ad..b709b98 100644
--- a/.github/workflows/reusable-cpp-tests-ubuntu.yml
+++ b/.github/workflows/reusable-cpp-tests-ubuntu.yml
@@ -10,6 +10,12 @@ name: 🇨 • Tests • ubuntu
 on:
   workflow_call:
     inputs:
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
       runs-on:
         description: >
           The ubuntu runner image to use. Defaults to 'ubuntu-latest'.
@@ -57,6 +63,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3
diff --git a/.github/workflows/reusable-cpp-tests-windows.yml b/.github/workflows/reusable-cpp-tests-windows.yml
index 4414d4d..d411490 100644
--- a/.github/workflows/reusable-cpp-tests-windows.yml
+++ b/.github/workflows/reusable-cpp-tests-windows.yml
@@ -10,6 +10,12 @@ name: 🇨 • Tests • windows
 on:
   workflow_call:
     inputs:
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
       runs-on:
         description: >
           The Windows runner image to use. Defaults to 'windows-latest'.
@@ -60,6 +66,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3
diff --git a/.github/workflows/reusable-python-ci.yml b/.github/workflows/reusable-python-ci.yml
index 7cf6933..74485ea 100644
--- a/.github/workflows/reusable-python-ci.yml
+++ b/.github/workflows/reusable-python-ci.yml
@@ -12,6 +12,16 @@ on:
   workflow_call:
     inputs:
       ###---- General inputs ----------------------------------------------------------------------------------------###
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
+      upload-coverage:
+        description: "Whether to upload the generated coverage reports"
+        default: true
+        type: boolean
       setup-z3:
         description: "Whether to set up Z3"
         default: false
@@ -130,12 +140,15 @@ jobs:
         include: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
     uses: ./.github/workflows/reusable-python-tests.yml
     with:
+      repository: ${{ inputs.repository }}
+      upload-coverage: ${{ inputs.upload-coverage }}
       runs-on: ${{ matrix.runs-on }}
       setup-z3: ${{ inputs.setup-z3 }}
       z3-version: ${{ inputs.z3-version }}
 
   python-coverage-upload:
     name: 📈
+    if: ${{ inputs.upload-coverage }}
     needs: [python-tests]
     runs-on: ubuntu-latest
     permissions:
diff --git a/.github/workflows/reusable-python-linter.yml b/.github/workflows/reusable-python-linter.yml
index f595fd7..c1c9075 100644
--- a/.github/workflows/reusable-python-linter.yml
+++ b/.github/workflows/reusable-python-linter.yml
@@ -10,6 +10,12 @@ name: 🐍 • Lint
 on:
   workflow_call:
     inputs:
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
       setup-z3:
         description: "Whether to set up Z3"
         default: false
@@ -28,6 +34,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3
diff --git a/.github/workflows/reusable-python-packaging.yml b/.github/workflows/reusable-python-packaging.yml
index d84e408..dffe37e 100644
--- a/.github/workflows/reusable-python-packaging.yml
+++ b/.github/workflows/reusable-python-packaging.yml
@@ -12,6 +12,16 @@ on:
   workflow_call:
     inputs:
       ###---- General inputs ----------------------------------------------------------------------------------------###
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
+      upload-artifacts:
+        description: "Whether to upload the generated artifacts"
+        default: true
+        type: boolean
       pure-python:
         description: "Whether this is a pure Python package (or contains compiled extensions)"
         default: false
@@ -90,6 +100,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # set up uv for faster Python package management
@@ -103,6 +114,7 @@ jobs:
         run: uvx twine check dist/*
       # upload the source distribution as an artifact (adds a `dev-` prefix for PRs)
       - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: ${{ inputs.upload-artifacts }}
         with:
           name: ${{ github.event_name == 'pull_request' && 'dev-' || '' }}cibw-sdist
           path: dist/*.tar.gz
@@ -115,6 +127,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # set up uv for faster Python package management
@@ -128,6 +141,7 @@ jobs:
         run: uvx twine check dist/*
       # upload the wheel as an artifact (adds a `dev-` prefix for PRs)
       - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: ${{ inputs.upload-artifacts }}
         with:
           name: ${{ github.event_name == 'pull_request' && 'dev-' || '' }}cibw-wheel
           path: dist/*.whl
@@ -188,6 +202,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3 (non-Ubuntu only)
@@ -217,6 +232,7 @@ jobs:
       # upload the wheels as an artifact (adds a `dev-` prefix for PRs)
       - name: Upload wheels
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: ${{ inputs.upload-artifacts }}
         with:
           name: ${{ github.event_name == 'pull_request' && 'dev-' || '' }}cibw-wheels-${{ matrix.runs-on }}-${{ strategy.job-index }}
           path: wheelhouse/*.whl
diff --git a/.github/workflows/reusable-python-tests.yml b/.github/workflows/reusable-python-tests.yml
index 21a69ff..8d8f4a3 100644
--- a/.github/workflows/reusable-python-tests.yml
+++ b/.github/workflows/reusable-python-tests.yml
@@ -10,6 +10,16 @@ name: 🐍 • Tests
 on:
   workflow_call:
     inputs:
+      repository:
+        description: >
+          The repository to run this action on.
+          Defaults to the repository this workflow is running in (`github.repository`).
+        default: ${{ github.repository }}
+        type: string
+      upload-coverage:
+        description: "Whether to upload the generated coverage reports"
+        default: true
+        type: boolean
       runs-on:
         description: "The platform to run the tests on"
         required: true
@@ -34,6 +44,7 @@ jobs:
       # check out the repository (including submodules and all history)
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
+          repository: ${{ inputs.repository }}
           submodules: recursive
           fetch-depth: 0
       # optionally set up Z3
@@ -70,6 +81,7 @@ jobs:
         run: uvx nox -s tests --verbose -- --cov --cov-report=xml:coverage-${{ inputs.runs-on }}.xml --cov-append
       # upload the report as an artifact to GitHub so that it can later be uploaded to Codecov
       - name: Upload 🐍 coverage report for ${{ inputs.runs-on }}
+        if: ${{ inputs.upload-coverage }}
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: coverage-${{ inputs.runs-on }}