♻️ make qiskit an optional dependency

Signed-off-by: burgholzer <[email protected]>

pyproject.toml

@@ -43,10 +43,16 @@ dependencies = [
     "mqt.core @ git+https://github.com/cda-tum/mqt-core@shared-libs",
     "importlib_resources>=5.0; python_version < '3.10'",
     "typing_extensions>=4.2; python_version < '3.11'", # used for typing.Unpack
-    "qiskit[qasm3-import]>=1.0.0",
+    "numpy>=2.1; python_version >= '3.13'",
+    "numpy>=1.26; python_version >= '3.12'",
+    "numpy>=1.24; python_version >= '3.11'",
+    "numpy>=1.22",
 ]
 dynamic = ["version"]
 
+[project.optional-dependencies]
+qiskit = ["qiskit[qasm3-import]>=1.0.0"]
+
 [project.urls]
 Homepage = "https://github.com/cda-tum/mqt-qcec"
 Documentation = "https://mqt.readthedocs.io/projects/qcec"
@@ -308,7 +314,7 @@ build = [
 ]
 docs = [
   "furo>=2024.8.6",
-  "qiskit[visualization]>=1.0.0",
+  "qiskit[qasm3-import,visualization]>=1.0.0",
   "setuptools-scm>=8.1",
   "sphinx-autoapi>=3.4.0",
   "sphinx-copybutton>=0.5.2",
@@ -319,12 +325,11 @@ docs = [
   "ipykernel>=6.29.5",
   "nbsphinx>=0.9.6",
   "sphinx-autodoc-typehints>=2.3.0",
-  "mqt-core[qiskit] @ git+https://github.com/cda-tum/mqt-core@shared-libs",
 ]
 test = [
   "pytest>=8.3.4",
   "pytest-cov>=6",
-  "mqt-core[qiskit] @ git+https://github.com/cda-tum/mqt-core@shared-libs",
+  "qiskit[qasm3-import]>=1.0.0",
 ]
 dev = [
   {include-group = "build"},

src/mqt/qcec/__init__.py

@@ -7,7 +7,6 @@
 from __future__ import annotations
 
 from ._version import version as __version__
-from .compilation_flow_profiles import AncillaMode, generate_profile
 from .pyqcec import (
     ApplicationScheme,
     Configuration,
@@ -16,17 +15,24 @@
     StateType,
 )
 from .verify import verify
-from .verify_compilation_flow import verify_compilation
+
+# Conditionally import functionality depending on the availability of Qiskit
+try:
+    from .compilation_flow_profiles import AncillaMode, generate_profile
+    from .verify_compilation_flow import verify_compilation
+
+    qiskit_installed = True
+except ImportError:
+    qiskit_installed = False
 
 __all__ = [
-    "AncillaMode",
     "ApplicationScheme",
     "Configuration",
     "EquivalenceCheckingManager",
     "EquivalenceCriterion",
     "StateType",
     "__version__",
-    "generate_profile",
     "verify",
-    "verify_compilation",
 ]
+if qiskit_installed:
+    __all__ += ["AncillaMode", "generate_profile", "verify_compilation"]