From 40cae5cfcf5e306731c5e85ca3523b1af36ef9e7 Mon Sep 17 00:00:00 2001
From: Thierry Martinez <thierry.martinez@inria.fr>
Date: Tue, 19 May 2026 10:20:22 +0200
Subject: [PATCH 1/3] Fix #468: Remove pyzx interface

Module pyzx is removed from Graphix and moved in a separate plugin as
we do for other optional dependencies.

https://github.com/thierry-martinez/graphix-pyzx/

See related PR:
https://github.com/thierry-martinez/graphix-pyzx/pull/1
---
 .github/workflows/cov.yml       |   2 +-
 .github/workflows/typecheck.yml |   6 +-
 CHANGELOG.md                    |  26 ++-
 README.md                       |  11 +-
 graphix/pyzx.py                 | 190 --------------------
 noxfile.py                      |  21 +--
 pyproject.toml                  |   3 -
 tests/test_pyzx.py              | 131 --------------
 uv.lock                         | 307 +-------------------------------
 9 files changed, 25 insertions(+), 672 deletions(-)
 delete mode 100644 graphix/pyzx.py
 delete mode 100644 tests/test_pyzx.py

diff --git a/.github/workflows/cov.yml b/.github/workflows/cov.yml
index 22b08f6ee..c6c551394 100644
--- a/.github/workflows/cov.yml
+++ b/.github/workflows/cov.yml
@@ -25,7 +25,7 @@ jobs:
           python-version: ${{ env.python-version }}
 
       - name: Run pytest
-        run: uv run --extra dev --extra extra pytest --cov=./graphix --cov-report=xml --cov-report=term --doctest-modules
+        run: uv run --extra dev pytest --cov=./graphix --cov-report=xml --cov-report=term --doctest-modules
 
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v5
diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
index a40d377cd..0b407d299 100644
--- a/.github/workflows/typecheck.yml
+++ b/.github/workflows/typecheck.yml
@@ -32,9 +32,9 @@ jobs:
           enable-cache: true
           python-version: ${{ env.python-version }}
 
-      - run: uv run --extra dev --extra extra --extra typing mypy
+      - run: uv run --extra dev --extra typing mypy
 
-      - run: uv run --extra dev --extra extra --extra typing pyright
+      - run: uv run --extra dev --extra typing pyright
 
   # Check that `mypy` find installed `graphix` package (#328)
   #
@@ -67,4 +67,4 @@ jobs:
         run: |
           cd ${{ runner.temp }}
           echo "from graphix import Pattern" > test_graphix_type.py
-          uv run --project ${{ github.workspace }} --no-sync mypy test_graphix_type.py
\ No newline at end of file
+          uv run --project ${{ github.workspace }} --no-sync mypy test_graphix_type.py
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fddc3d857..1cb85f851 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,14 +11,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - #490: Introduced new `Instruction` and `Command` namespace classes for instruction and command instantiation.
 
-- #476 Introduced new methods `OpenGraph.extract_circuit`, `CliffordMap.to_tableau` and new function `graphix.circ_ext.compilation.cm_berg_pass`. Circuit extraction can be done natively in Graphix.
+- #476: Introduced new methods `OpenGraph.extract_circuit`, `CliffordMap.to_tableau` and new function `graphix.circ_ext.compilation.cm_berg_pass`. Circuit extraction can be done natively in Graphix.
 
-- #505
+- #505:
   - Added new methods `XZCorrections.to_causal_flow` and `XZCorrections.to_gflow` which subsume  `StandardizedPattern.extract_causal_flow` and `StandardizedPattern.extract_gflow`.
   - Added new methods `XZCorrections.to_bloch` and `XZCorrections.downcast_bloch`.
 
 ### Fixed
 
+- #454, #481: Ensure `Pattern.minimize_space` only reduces max-space and does not increase it.
+
+- #235, #489: Correct sign for `YZ` measurements in `from_pyzx_graph`. ZX diagrams are now correctly converted into open graphs, even if they are reduced.
+
 ### Changed
 
 - #490: Exposed more common classes and methods to top level `__init__.py`.
@@ -26,27 +30,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Moved `InstructionType`, `InstructionTypeWithoutRZZ`, `CommandType`, `Correction` and `CommandOrNoise` to `TYPE_CHECKING` blocks.
   - Renamed `DrawAnnotations` to `DrawPatternAnnotations`.
 
-- #479: Added new methods `OpenGraph.draw`, `PauliFlow.draw` and `XZCorrections.draw`.
+- #452: Use `uv` for dependency management
 
 - #454, #481: New space minimization API that allows users to select or define custom heuristics.
 
-- #476
+- #476:
   - Added new field `dim` to `PauliString` to represent the dimension of the Hilbert space.
   - Define `PauliString` on qubit indices and remove all `remap` methods.
   - Represent `x_map` and `z_map` attributes of `CliffordMap` as sequences of `PauliString` instead of mappings.
   - Rename `PauliFlow.pauli_strings` property as `PauliFlow.extraction_pauli_strings`.
 
-### Fixed
-
-- #454, #481: Ensure `Pattern.minimize_space` only reduces max-space and does not increase it.
-
-- #235, #489: Correct sign for `YZ` measurements in `from_pyzx_graph`. ZX diagrams are now correctly converted into open graphs, even if they are reduced.
+- #479:
+  - Method `Pattern.draw_graph` subsumed by two different methods: `Pattern.draw_flow` and `Pattern.draw_xzcorrections`.
+  - Added new methods `OpenGraph.draw`, `PauliFlow.draw` and `XZCorrections.draw`.
 
-### Changed
-
-- #479: Method `Pattern.draw_graph` subsumed by two different methods: `Pattern.draw_flow` and `Pattern.draw_xzcorrections`.
-
-- #452: Use `uv` for dependency management
+- #468, #511: `pyzx` module is moved in a separate plugin: https://github.com/thierry-martinez/graphix-pyzx/
 
 ## [0.3.5] - 2026-03-26
 
diff --git a/README.md b/README.md
index d40169b05..9154fbbdc 100644
--- a/README.md
+++ b/README.md
@@ -92,12 +92,13 @@ state_out = pattern.simulate_pattern(backend="statevector")
 
 ## Graphix plugins
 
-- [graphix-stim-backend](https://github.com/thierry-martinez/graphix-stim-backend): `stim` backend for efficient Clifford pattern simulation
-- [graphix-symbolic](https://github.com/TeamGraphix/graphix-symbolic): parameterized patterns with symbolic simulation
-- [graphix-ibmq](https://github.com/TeamGraphix/graphix-ibmq): pattern transpiler for IBMQ / `qiskit`
-- [graphix-perceval](https://github.com/TeamGraphix/graphix-perceval): pattern transpiler for Quandela's `perceval` simulator and QPU
-- [graphix-qasm-parser](https://github.com/TeamGraphix/graphix-qasm-parser): a plugin for parsing OpenQASM circuit.
+- [`graphix-ibmq`](https://github.com/TeamGraphix/graphix-ibmq): pattern transpiler for IBMQ / `qiskit`
+- [`graphix-perceval`](https://github.com/TeamGraphix/graphix-perceval): pattern transpiler for Quandela's `perceval` simulator and QPU
+- [`graphix-pyzx`](https://github.com/thierry-martinez/graphix-pyzx): conversion between open graphs and PyZX diagrams
+- [`graphix-qasm-parser`](https://github.com/TeamGraphix/graphix-qasm-parser): a plugin for parsing OpenQASM circuit.
+- [`graphix-stim-backend`](https://github.com/thierry-martinez/graphix-stim-backend): `stim` backend for efficient Clifford pattern simulation
 - [`graphix-stim-compiler`](https://github.com/qat-inria/graphix-stim-compiler): `stim` backend for efficient compilation of Clifford maps.
+- [`graphix-symbolic`](https://github.com/TeamGraphix/graphix-symbolic): parameterized patterns with symbolic simulation
 
 ## Related packages
 
diff --git a/graphix/pyzx.py b/graphix/pyzx.py
deleted file mode 100644
index bbda27e82..000000000
--- a/graphix/pyzx.py
+++ /dev/null
@@ -1,190 +0,0 @@
-"""Functionality for converting between OpenGraphs and :mod:`pyzx`.
-
-These functions are held in their own file rather than including them in the
-OpenGraph class because we want :mod:`pyzx` to be an optional dependency.
-"""
-
-from __future__ import annotations
-
-from fractions import Fraction
-from typing import TYPE_CHECKING, SupportsFloat
-
-import networkx as nx
-import pyzx as zx
-from pyzx.graph import Graph
-from pyzx.utils import EdgeType, FractionLike, VertexType
-
-from graphix.fundamentals import Plane
-from graphix.measurements import Measurement
-from graphix.opengraph import OpenGraph
-
-if TYPE_CHECKING:
-    from pyzx.graph.base import BaseGraph
-
-    from graphix.measurements import BlochMeasurement
-    from graphix.parameter import ExpressionOrFloat
-
-
-def _fraction_of_angle(angle: ExpressionOrFloat) -> Fraction:
-    if not isinstance(angle, SupportsFloat):
-        raise TypeError("Parametric angles are not supported by pyzx")
-    return Fraction(angle)
-
-
-def to_pyzx_graph(og: OpenGraph[BlochMeasurement]) -> BaseGraph[int, tuple[int, int]]:
-    """Return a :mod:`pyzx` graph corresponding to the open graph.
-
-    Example
-    -------
-    >>> import networkx as nx
-    >>> from graphix.pyzx import to_pyzx_graph
-    >>> g = nx.Graph([(0, 1), (1, 2)])
-    >>> inputs = [0]
-    >>> outputs = [2]
-    >>> measurements = {0: Measurement.XY(0), 1: Measurement.YZ(1)}
-    >>> og = OpenGraph(g, inputs, outputs, measurements)
-    >>> reconstructed_pyzx_graph = to_pyzx_graph(og)
-    """
-    g = Graph()
-
-    # Add vertices into the graph and set their type
-    def add_vertices(n: int, ty: VertexType) -> list[VertexType]:
-        verts = g.add_vertices(n)
-        for vert in verts:
-            g.set_type(vert, ty)
-
-        return verts
-
-    # Add input boundary nodes
-    in_verts = add_vertices(len(og.input_nodes), VertexType.BOUNDARY)
-    g.set_inputs(tuple(in_verts))
-
-    # Add nodes for internal Z spiders - not including the phase gadgets
-    body_verts = add_vertices(len(og.graph), VertexType.Z)
-
-    # Add nodes for the phase gadgets. In OpenGraph we don't store the
-    # effect as a separate node, it is instead just stored in the
-    # "measurement" attribute of the node it measures.
-    x_meas = [i for i, m in og.measurements.items() if m.plane == Plane.YZ]
-    x_meas_verts = add_vertices(len(x_meas), VertexType.Z)
-
-    out_verts = add_vertices(len(og.output_nodes), VertexType.BOUNDARY)
-    g.set_outputs(tuple(out_verts))
-
-    # Maps a node's ID in the Open Graph to it's corresponding node ID in
-    # the PyZX graph and vice versa.
-    map_to_og = dict(zip(body_verts, og.graph.nodes(), strict=True))
-    map_to_pyzx = {v: i for i, v in map_to_og.items()}
-
-    # Open Graph's don't have boundary nodes, so we need to connect the
-    # input and output Z spiders to their corresponding boundary nodes in
-    # pyzx.
-    for pyzx_index, og_index in zip(in_verts, og.input_nodes, strict=True):
-        g.add_edge((pyzx_index, map_to_pyzx[og_index]))
-    for pyzx_index, og_index in zip(out_verts, og.output_nodes, strict=True):
-        g.add_edge((pyzx_index, map_to_pyzx[og_index]))
-
-    og_edges = og.graph.edges()
-    pyzx_edges = ((map_to_pyzx[a], map_to_pyzx[b]) for a, b in og_edges)
-    g.add_edges(pyzx_edges, EdgeType.HADAMARD)
-
-    # Add the edges between the Z spiders in the graph body
-    for og_index, meas in og.measurements.items():
-        # If it's an X measured node, then we handle it in the next loop
-        if meas.plane == Plane.XY:
-            g.set_phase(map_to_pyzx[og_index], -_fraction_of_angle(meas.angle))
-
-    # Connect the X measured vertices
-    for og_index, pyzx_index in zip(x_meas, x_meas_verts, strict=True):
-        g.add_edge((map_to_pyzx[og_index], pyzx_index), EdgeType.HADAMARD)
-        g.set_phase(pyzx_index, -_fraction_of_angle(og.measurements[og_index].angle))
-
-    return g
-
-
-def _checked_float(x: FractionLike) -> float:
-    if not isinstance(x, SupportsFloat):
-        # Possibly a Poly object
-        raise TypeError(f"Cannot convert {x} to a float.")
-    return float(x)
-
-
-def from_pyzx_graph(g: BaseGraph[int, tuple[int, int]]) -> OpenGraph[Measurement]:
-    """Construct an :class:`OpenGraph` from a :mod:`pyzx` graph.
-
-    This method may add additional nodes to the graph so that it adheres
-    with the definition of an OpenGraph. For instance, if the final node on
-    a qubit is measured, it will add two nodes behind it so that no output
-    nodes are measured to satisfy the requirements of an open graph.
-
-    Example
-    -------
-    >>> import pyzx as zx
-    >>> from graphix.pyzx import from_pyzx_graph
-    >>> circ = zx.qasm("qreg q[2]; h q[1]; cx q[0], q[1]; h q[1];")
-    >>> g = circ.to_graph()
-    >>> og = from_pyzx_graph(g)
-    """
-    zx.simplify.to_graph_like(g)
-
-    measurements: dict[int, Measurement] = {}
-    inputs = list(g.inputs())
-    outputs = list(g.outputs())
-
-    g_nx = nx.Graph(g.edges())
-
-    # We need to do this since the full reduce simplification can
-    # leave either hadamard or plain wires on the inputs and outputs
-    for inp in g.inputs():
-        first_nbr = next(iter(g.neighbors(inp)))
-        et = g.edge_type((first_nbr, inp))
-
-        if et == EdgeType.SIMPLE:
-            g_nx.remove_node(inp)
-            inputs = [i if i != inp else first_nbr for i in inputs]
-
-    for out in g.outputs():
-        first_nbr = next(iter(g.neighbors(out)))
-        et = g.edge_type((first_nbr, out))
-
-        if et == EdgeType.SIMPLE:
-            g_nx.remove_node(out)
-            outputs = [o if o != out else first_nbr for o in outputs]
-
-    # Turn all phase gadgets into measurements
-    # Since we did a full reduce, any node that isn't an input or output
-    # node and has only one neighbour is definitely a phase gadget.
-    nodes = list(g_nx.nodes())
-    for v in nodes:
-        if v in inputs or v in outputs:
-            continue
-
-        nbrs = list(g.neighbors(v))
-        if len(nbrs) == 1:
-            measurements[nbrs[0]] = Measurement.YZ(_checked_float(g.phase(v)))
-            g_nx.remove_node(v)
-
-    next_id = max(g_nx.nodes) + 1
-
-    # Since outputs can't be measured, we need to add an extra two nodes
-    # in to counter it
-    for out in outputs:
-        if g.phase(out) == 0:
-            continue
-
-        g_nx.add_edges_from([(out, next_id), (next_id, next_id + 1)])
-        measurements[next_id] = Measurement.X
-
-        outputs = [o if o != out else next_id + 1 for o in outputs]
-        next_id += 2
-
-    # Add the phase to all XY measured nodes
-    for v in g_nx.nodes:
-        if v in outputs or v in measurements:
-            continue
-
-        # g.phase() may be a fractions.Fraction object, but Measurement
-        # expects a float
-        measurements[v] = Measurement.XY(-_checked_float(g.phase(v)))
-
-    return OpenGraph(g_nx, inputs, outputs, measurements)
diff --git a/noxfile.py b/noxfile.py
index 5379888a5..bdd1c6ee8 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -43,28 +43,10 @@ def tests_minimal(session: Session) -> None:
     run_pytest(session, mpl=True)
 
 
-@nox.session(python=PYTHON_VERSIONS)
-def tests_dev(session: Session) -> None:
-    """Run the test suite with dev dependencies."""
-    session.install(".[dev]")
-    # We cannot run `pytest --doctest-modules` here, since some tests
-    # involve optional dependencies, like pyzx.
-    run_pytest(session, mpl=True)
-
-
-@nox.session(python=PYTHON_VERSIONS)
-def tests_extra(session: Session) -> None:
-    """Run the test suite with extra dependencies."""
-    session.install(".[extra]")
-    install_pytest(session)
-    session.install("nox")  # needed for `--doctest-modules`
-    run_pytest(session, doctest_modules=True)
-
-
 @nox.session(python=PYTHON_VERSIONS)
 def tests_all(session: Session) -> None:
     """Run the test suite with all dependencies."""
-    session.install(".[dev,extra]")
+    session.install(".[dev]")
     # This dependency is added here to avoid circular dependencies
     session.install("graphix-qasm-parser>=0.1.1")
     run_pytest(session, doctest_modules=True, mpl=True)
@@ -123,6 +105,7 @@ class ReverseDependency:
         ),
         ReverseDependency("https://github.com/TeamGraphix/graphix-ibmq", doctest_modules=False),
         ReverseDependency("https://github.com/qat-inria/graphix-stim-compiler", branch="ps_dim"),
+        ReverseDependency("https://github.com/thierry-martinez/graphix-pyzx", branch="pyzx_from_graphix"),
     ],
 )
 def tests_reverse_dependencies(session: Session, package: ReverseDependency) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index afe99d0e3..bdb4db5aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,9 +69,6 @@ doc = [
     "sphinx",
     "sphinx-gallery",
 ]
-extra = [
-    "pyzx>=0.10.0",
-]
 typing = [
     "numpy==2.4.2; python_version >= '3.11'",
     "numba==0.65.1; python_version >= '3.11'",
diff --git a/tests/test_pyzx.py b/tests/test_pyzx.py
deleted file mode 100644
index e4a0d868e..000000000
--- a/tests/test_pyzx.py
+++ /dev/null
@@ -1,131 +0,0 @@
-from __future__ import annotations
-
-from copy import deepcopy
-from typing import TYPE_CHECKING
-
-import numpy as np
-import pytest
-from numpy.random import PCG64, Generator
-
-from graphix.fundamentals import ANGLE_PI
-from graphix.random_objects import rand_circuit
-from graphix.transpiler import Circuit
-
-if TYPE_CHECKING:
-    from graphix import Pattern
-    from graphix.sim.statevec import Statevec
-
-try:
-    import pyzx as zx
-    from pyzx.generate import cliffordT as clifford_t  # noqa: N813
-
-    from graphix.pyzx import from_pyzx_graph, to_pyzx_graph
-except ImportError:
-    pytestmark = pytest.mark.skip(reason="pyzx not installed")
-
-    if TYPE_CHECKING:
-        import sys
-
-        # We skip type-checking the case where there is no pyzx, since
-        # pyright cannot figure out that tests are skipped in this
-        # case.
-        sys.exit(1)
-
-
-if TYPE_CHECKING:
-    from pyzx.graph.base import BaseGraph
-
-
-def test_graph_equality(fx_rng: Generator) -> None:
-    # No default value for `byteorder` in Python 3.10
-    seed = int.from_bytes(fx_rng.integers(0, 256, size=16, dtype=np.uint8).tobytes(), byteorder="big")
-    g = clifford_t(4, 10, 0.1, seed=seed)
-
-    og1 = from_pyzx_graph(g)
-
-    g_copy = deepcopy(g)
-    og2 = from_pyzx_graph(g_copy)
-
-    assert og1.isclose(og2)
-
-
-def assert_reconstructed_pyzx_graph_equal(g: BaseGraph[int, tuple[int, int]]) -> None:
-    """Convert a graph to and from an Open graph and then checks the resulting pyzx graph is equal to the original."""
-    zx.simplify.to_graph_like(g)
-
-    g_copy = deepcopy(g)
-    og = from_pyzx_graph(g_copy)
-    reconstructed_pyzx_graph = to_pyzx_graph(og.to_bloch())
-
-    # The "tensorfy" function break if the rows aren't set for some reason
-    for v in reconstructed_pyzx_graph.vertices():
-        reconstructed_pyzx_graph.set_row(v, 2)
-
-    for v in g.vertices():
-        g.set_row(v, 2)
-    ten = zx.tensorfy(g)
-    ten_graph = zx.tensorfy(reconstructed_pyzx_graph)
-    assert zx.compare_tensors(ten, ten_graph)
-
-
-# Tests that compiling from a pyzx graph to an OpenGraph returns the same
-# graph. Only works with small circuits up to 4 qubits since PyZX's `tensorfy`
-# function seems to consume huge amount of memory for larger qubit
-def test_random_clifford_t() -> None:
-    for _ in range(15):
-        g = clifford_t(4, 10, 0.1)
-        assert_reconstructed_pyzx_graph_equal(g)
-
-
-def simulate_pattern(pattern: Pattern, rng: Generator) -> Statevec:
-    pattern.remove_input_nodes()
-    pattern.perform_pauli_measurements()
-    pattern.minimize_space()
-    return pattern.simulate_pattern(rng=rng)
-
-
-def check_round_trip(pattern: Pattern, rng: Generator, full_reduce: bool) -> bool:
-    opengraph = pattern.extract_opengraph()
-    zx_graph = to_pyzx_graph(opengraph.to_bloch())
-    if full_reduce:
-        zx_graph.normalize()
-        zx.simplify.full_reduce(zx_graph)
-    opengraph2 = from_pyzx_graph(zx_graph)
-    pattern2 = opengraph2.infer_pauli_measurements().to_pattern()
-    state = simulate_pattern(pattern, rng)
-    state2 = simulate_pattern(pattern2, rng)
-    return state.isclose(state2)
-
-
-@pytest.mark.parametrize("jumps", range(1, 11))
-@pytest.mark.parametrize("full_reduce", [False, True])
-def test_random_circuit(fx_bg: PCG64, jumps: int, full_reduce: bool) -> None:
-    rng = Generator(fx_bg.jumped(jumps))
-    nqubits = 5
-    depth = 5
-    circuit = rand_circuit(nqubits, depth, rng, use_rzz=True)
-    pattern = circuit.transpile().pattern
-    assert check_round_trip(pattern, rng, full_reduce)
-
-
-def test_rz(fx_rng: Generator) -> None:
-    circuit = Circuit(2)
-    circuit.rz(0, ANGLE_PI / 4)
-    pattern = circuit.transpile().pattern
-    # pyzx 0.8 does not support arithmetic expressions such as `pi / 4`.
-    circ = zx.qasm(f"qreg q[2]; rz({np.pi / 4}) q[0];")  # type: ignore[attr-defined]
-    g = circ.to_graph()
-    og = from_pyzx_graph(g).infer_pauli_measurements()
-    pattern_zx = og.to_pattern()
-    state = pattern.simulate_pattern(rng=fx_rng)
-    state_zx = pattern_zx.simulate_pattern(rng=fx_rng)
-    assert state_zx.isclose(state)
-
-
-@pytest.mark.parametrize("full_reduce", [False, True])
-def test_ccx(fx_rng: Generator, full_reduce: bool) -> None:
-    # Issue #235
-    circuit = Circuit(3)
-    circuit.ccx(0, 1, 2)
-    pattern = circuit.transpile().pattern
-    assert check_round_trip(pattern, fx_rng, full_reduce)
diff --git a/uv.lock b/uv.lock
index 453fa7d58..6b34443ed 100644
--- a/uv.lock
+++ b/uv.lock
@@ -84,15 +84,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/bd/46/d3ec57ad500f598d1554bd14ce4df615960549ab2844961bc4e1f5fbd174/ast_serialize-0.3.0-cp39-abi3-win_arm64.whl", hash = "sha256:0dd00da29985f15f50dc35728b7e1e7c84507bccfea1d9914738530f1c72238a", size = 1077165, upload-time = "2026-04-30T23:24:46.377Z" },
 ]
 
-[[package]]
-name = "asttokens"
-version = "3.0.1"
-source = { registry = "https://pypi.org/simple" }
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@@ -3034,20 +2770,6 @@ wheels = [
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From ba46e52164a897994a00a8be4ad66b404de79b42 Mon Sep 17 00:00:00 2001
From: Thierry Martinez <thierry.martinez@inria.fr>
Date: Thu, 28 May 2026 00:20:45 +0200
Subject: [PATCH 2/3] Document `extra` dependency group removal

---
 CHANGELOG.md    |  3 ++-
 CONTRIBUTING.md |  2 +-
 README.md       | 10 ++--------
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb032e9b1..f28f41e73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,7 +51,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - #507: Static method `PauliString.from_measured_node` is subsumed by the function `extraction_ps_from_corrected_node`.
 
-- #468, #511: `pyzx` module is moved in a separate plugin: https://github.com/thierry-martinez/graphix-pyzx/
+- #468, #511: The `pyzx` module has been moved to a separate plugin: https://github.com/thierry-martinez/graphix-pyzx/
+  Consequently, the `pyproject.toml` no longer defines an `extra` dependency group for the `pyzx` package.
 
 ## [0.3.5] - 2026-03-26
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c3637d607..75d732829 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -15,7 +15,7 @@ Once created, you'll need to clone the repository, and you can follow below to s
 git clone git@github.com:<username>/graphix.git
 cd graphix
 pip install uv
-uv sync --extra dev --extra extra
+uv sync --extra dev
 ```
 
 ## Local checks
diff --git a/README.md b/README.md
index 6616189a2..9a4b61cee 100644
--- a/README.md
+++ b/README.md
@@ -28,12 +28,6 @@ Install `graphix` with `pip`:
 pip install graphix
 ```
 
-Install with [extra dependencies](https://github.com/TeamGraphix/graphix/blob/master/pyproject.toml) (e.g. pyzx):
-
-```bash
-pip install graphix[extra]
-```
-
 ### Editable installation using pip and uv
 
 As well as support for editable installation using pip, Graphix also supports using `uv`:
@@ -41,10 +35,10 @@ As well as support for editable installation using pip, Graphix also supports us
 ```bash
 git clone https://github.com/TeamGraphix/graphix.git
 cd graphix
-uv sync --extra dev --extra extra
+uv sync --extra dev
 ```
 
-This creates a virtual environment and installs all development and extra dependencies from the `pyproject.toml` and `uv` lockfile.
+This creates a virtual environment and installs all development dependencies from the `pyproject.toml` and `uv` lockfile.
 
 ## Using graphix
 

From 13671dc241ca24705536e6825c0911fd14bab5ba Mon Sep 17 00:00:00 2001
From: Thierry Martinez <thierry.martinez@inria.fr>
Date: Thu, 28 May 2026 00:22:56 +0200
Subject: [PATCH 3/3] Remove `test_pyzx.py`

---
 tests/test_pyzx.py | 130 ---------------------------------------------
 1 file changed, 130 deletions(-)
 delete mode 100644 tests/test_pyzx.py

diff --git a/tests/test_pyzx.py b/tests/test_pyzx.py
deleted file mode 100644
index a45762e18..000000000
--- a/tests/test_pyzx.py
+++ /dev/null
@@ -1,130 +0,0 @@
-from __future__ import annotations
-
-from copy import deepcopy
-from typing import TYPE_CHECKING
-
-import numpy as np
-import pytest
-from numpy.random import PCG64, Generator
-
-from graphix.fundamentals import ANGLE_PI
-from graphix.random_objects import rand_circuit
-from graphix.transpiler import Circuit
-
-if TYPE_CHECKING:
-    from graphix import Pattern
-    from graphix.sim.statevec import Statevec
-
-try:
-    import pyzx as zx
-    from pyzx.generate import cliffordT as clifford_t  # noqa: N813
-
-    from graphix.pyzx import from_pyzx_graph, to_pyzx_graph
-except ImportError:
-    pytestmark = pytest.mark.skip(reason="pyzx not installed")
-
-    if TYPE_CHECKING:
-        import sys
-
-        # We skip type-checking the case where there is no pyzx, since
-        # pyright cannot figure out that tests are skipped in this
-        # case.
-        sys.exit(1)
-
-
-if TYPE_CHECKING:
-    from pyzx.graph.base import BaseGraph
-
-
-def test_graph_equality(fx_rng: Generator) -> None:
-    # No default value for `byteorder` in Python 3.10
-    seed = int.from_bytes(fx_rng.integers(0, 256, size=16, dtype=np.uint8).tobytes(), byteorder="big")
-    g = clifford_t(4, 10, 0.1, seed=seed)
-
-    og1 = from_pyzx_graph(g)
-
-    g_copy = deepcopy(g)
-    og2 = from_pyzx_graph(g_copy)
-
-    assert og1.isclose(og2)
-
-
-def assert_reconstructed_pyzx_graph_equal(g: BaseGraph[int, tuple[int, int]]) -> None:
-    """Convert a graph to and from an Open graph and then checks the resulting pyzx graph is equal to the original."""
-    zx.simplify.to_graph_like(g)
-
-    g_copy = deepcopy(g)
-    og = from_pyzx_graph(g_copy)
-    reconstructed_pyzx_graph = to_pyzx_graph(og.to_bloch())
-
-    # The "tensorfy" function break if the rows aren't set for some reason
-    for v in reconstructed_pyzx_graph.vertices():
-        reconstructed_pyzx_graph.set_row(v, 2)
-
-    for v in g.vertices():
-        g.set_row(v, 2)
-    ten = zx.tensorfy(g)
-    ten_graph = zx.tensorfy(reconstructed_pyzx_graph)
-    assert zx.compare_tensors(ten, ten_graph)
-
-
-# Tests that compiling from a pyzx graph to an OpenGraph returns the same
-# graph. Only works with small circuits up to 4 qubits since PyZX's `tensorfy`
-# function seems to consume huge amount of memory for larger qubit
-def test_random_clifford_t() -> None:
-    for _ in range(15):
-        g = clifford_t(4, 10, 0.1)
-        assert_reconstructed_pyzx_graph_equal(g)
-
-
-def simulate_pattern(pattern: Pattern, rng: Generator) -> Statevec:
-    pattern.remove_pauli_measurements()
-    pattern.minimize_space()
-    return pattern.simulate_pattern(rng=rng)
-
-
-def check_round_trip(pattern: Pattern, rng: Generator, full_reduce: bool) -> bool:
-    opengraph = pattern.extract_opengraph()
-    zx_graph = to_pyzx_graph(opengraph.to_bloch())
-    if full_reduce:
-        zx_graph.normalize()
-        zx.simplify.full_reduce(zx_graph)
-    opengraph2 = from_pyzx_graph(zx_graph)
-    pattern2 = opengraph2.infer_pauli_measurements().to_pattern()
-    state = simulate_pattern(pattern, rng)
-    state2 = simulate_pattern(pattern2, rng)
-    return state.isclose(state2)
-
-
-@pytest.mark.parametrize("jumps", range(1, 11))
-@pytest.mark.parametrize("full_reduce", [False, True])
-def test_random_circuit(fx_bg: PCG64, jumps: int, full_reduce: bool) -> None:
-    rng = Generator(fx_bg.jumped(jumps))
-    nqubits = 5
-    depth = 5
-    circuit = rand_circuit(nqubits, depth, rng, use_rzz=True)
-    pattern = circuit.transpile().pattern
-    assert check_round_trip(pattern, rng, full_reduce)
-
-
-def test_rz(fx_rng: Generator) -> None:
-    circuit = Circuit(2)
-    circuit.rz(0, ANGLE_PI / 4)
-    pattern = circuit.transpile().pattern
-    # pyzx 0.8 does not support arithmetic expressions such as `pi / 4`.
-    circ = zx.qasm(f"qreg q[2]; rz({np.pi / 4}) q[0];")  # type: ignore[attr-defined]
-    g = circ.to_graph()
-    og = from_pyzx_graph(g).infer_pauli_measurements()
-    pattern_zx = og.to_pattern()
-    state = pattern.simulate_pattern(rng=fx_rng)
-    state_zx = pattern_zx.simulate_pattern(rng=fx_rng)
-    assert state_zx.isclose(state)
-
-
-@pytest.mark.parametrize("full_reduce", [False, True])
-def test_ccx(fx_rng: Generator, full_reduce: bool) -> None:
-    # Issue #235
-    circuit = Circuit(3)
-    circuit.ccx(0, 1, 2)
-    pattern = circuit.transpile().pattern
-    assert check_round_trip(pattern, fx_rng, full_reduce)