Fix parameter display in notebook (call createParameterizedCircuit before printing n_gamma/n_beta)

Co-authored-by: fgfuchs <2428162+fgfuchs@users.noreply.github.com>

Author: Copilot

examples/MaxCut/MixerComparison.ipynb

@@ -8,15 +8,15 @@
     "\n",
     "This notebook compares three QAOA variants on the **house graph** (5 nodes, 6 edges):\n",
     "\n",
-    "| Variant | Problem | Mixer | γ / layer | β / layer |\n",
+    "| Variant | Problem | Mixer | \u03b3 / layer | \u03b2 / layer |\n",
     "|---------|---------|-------|-----------|----------|\n",
     "| **Vanilla** | `MaxCut` | `X` | 1 | 1 |\n",
     "| **Free** | `MaxCut` | `XMultiAngle` | 1 | N (one per qubit) |\n",
     "| **Orbit** | `MaxCutOrbit` | `X` | K (one per edge orbit) | 1 |\n",
     "\n",
-    "- **Vanilla QAOA** uses the standard X mixer with a single shared γ and β per layer.\n",
-    "- **Free QAOA** (multi-angle) gives each qubit its own independent β, increasing expressibility.\n",
-    "- **Orbit QAOA** exploits the graph's automorphism group: edges in the same symmetry orbit share a γ parameter, enabling the optimizer to differentiate structurally distinct edge types without the full multi-angle overhead."
+    "- **Vanilla QAOA** uses the standard X mixer with a single shared \u03b3 and \u03b2 per layer.\n",
+    "- **Free QAOA** (multi-angle) gives each qubit its own independent \u03b2, increasing expressibility.\n",
+    "- **Orbit QAOA** exploits the graph's automorphism group: edges in the same symmetry orbit share a \u03b3 parameter, enabling the optimizer to differentiate structurally distinct edge types without the full multi-angle overhead."
    ]
   },
   {
@@ -101,7 +101,7 @@
    "source": [
     "### Edge Orbits of the House Graph\n",
     "\n",
-    "The orbit QAOA assigns one γ parameter per edge orbit of the graph's automorphism group."
+    "The orbit QAOA assigns one \u03b3 parameter per edge orbit of the graph's automorphism group."
    ]
   },
   {
@@ -129,30 +129,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Vanilla QAOA: X mixer, single γ and β per layer\n",
-    "qaoa_vanilla = QAOA(\n",
-    "    problem=problems.MaxCut(G),\n",
-    "    mixer=mixers.X(),\n",
-    "    initialstate=initialstates.Plus(),\n",
-    ")\n",
-    "\n",
-    "# Free QAOA: XMultiAngle mixer, one β per qubit\n",
-    "qaoa_free = QAOA(\n",
-    "    problem=problems.MaxCut(G),\n",
-    "    mixer=mixers.XMultiAngle(),\n",
-    "    initialstate=initialstates.Plus(),\n",
-    ")\n",
-    "\n",
-    "# Orbit QAOA: X mixer, one γ per edge orbit of the graph\n",
-    "qaoa_orbit = QAOA(\n",
-    "    problem=problems.MaxCutOrbit(G),\n",
-    "    mixer=mixers.X(),\n",
-    "    initialstate=initialstates.Plus(),\n",
-    ")\n",
-    "\n",
-    "print(f\"Vanilla  — γ/layer: {qaoa_vanilla.n_gamma}, β/layer: {qaoa_vanilla.n_beta}\")\n",
-    "print(f\"Free     — γ/layer: {qaoa_free.n_gamma},    β/layer: {qaoa_free.n_beta}\")\n",
-    "print(f\"Orbit    — γ/layer: {qaoa_orbit.n_gamma},   β/layer: {qaoa_orbit.n_beta}\")"
+    "# Vanilla QAOA: X mixer, single \u03b3 and \u03b2 per layer\nqaoa_vanilla = QAOA(\n    problem=problems.MaxCut(G),\n    mixer=mixers.X(),\n    initialstate=initialstates.Plus(),\n)\n\n# Free QAOA: XMultiAngle mixer, one \u03b2 per qubit\nqaoa_free = QAOA(\n    problem=problems.MaxCut(G),\n    mixer=mixers.XMultiAngle(),\n    initialstate=initialstates.Plus(),\n)\n\n# Orbit QAOA: X mixer, one \u03b3 per edge orbit of the graph\nqaoa_orbit = QAOA(\n    problem=problems.MaxCutOrbit(G),\n    mixer=mixers.X(),\n    initialstate=initialstates.Plus(),\n)\n\n# Build circuits at depth 1 to inspect parameter counts\nfor q in (qaoa_vanilla, qaoa_free, qaoa_orbit):\n    q.createParameterizedCircuit(depth=1)\n\nprint(f\"Vanilla  \u2014 \u03b3/layer: {qaoa_vanilla.n_gamma}, \u03b2/layer: {qaoa_vanilla.n_beta}\")\nprint(f\"Free     \u2014 \u03b3/layer: {qaoa_free.n_gamma},    \u03b2/layer: {qaoa_free.n_beta}\")\nprint(f\"Orbit    \u2014 \u03b3/layer: {qaoa_orbit.n_gamma},   \u03b2/layer: {qaoa_orbit.n_beta}\")"
    ]
   },
   {
@@ -161,7 +138,7 @@
    "source": [
     "### Energy Landscape at Depth 1 (Vanilla)\n",
     "\n",
-    "Sample the energy landscape over (γ, β) for the vanilla instance."
+    "Sample the energy landscape over (\u03b3, \u03b2) for the vanilla instance."
    ]
   },
   {
@@ -175,7 +152,7 @@
     "\n",
     "fig = plt.figure(figsize=(6, 5))\n",
     "plot_E(qaoa_vanilla, fig=fig)\n",
-    "plt.title(\"Vanilla QAOA — energy landscape (depth 1)\")\n",
+    "plt.title(\"Vanilla QAOA \u2014 energy landscape (depth 1)\")\n",
     "plt.show()"
    ]
   },
@@ -236,7 +213,7 @@
     "    fig=fig,\n",
     ")\n",
     "\n",
-    "plt.title(\"Approximation ratio vs. depth — House graph\")\n",
+    "plt.title(\"Approximation ratio vs. depth \u2014 House graph\")\n",
     "plt.tight_layout()\n",
     "plt.show()"
    ]
@@ -247,9 +224,9 @@
    "source": [
     "### Optimal Angles at Maximum Depth (Vanilla)\n",
     "\n",
-    "`plot_angles` expects the standard 1 γ + 1 β per-layer format.  \n",
+    "`plot_angles` expects the standard 1 \u03b3 + 1 \u03b2 per-layer format.  \n",
     "We display it for the vanilla variant; the free and orbit instances use a\n",
-    "different layout (multiple γ or β per layer)."
+    "different layout (multiple \u03b3 or \u03b2 per layer)."
    ]
   },
   {
@@ -260,7 +237,7 @@
    "source": [
     "fig = plt.figure()\n",
     "plot_angles(qaoa_vanilla, maxdepth, label=\"Vanilla\", style=\"ob\", fig=fig)\n",
-    "plt.title(f\"Optimal angles — Vanilla QAOA, depth {maxdepth}\")\n",
+    "plt.title(f\"Optimal angles \u2014 Vanilla QAOA, depth {maxdepth}\")\n",
     "plt.tight_layout()\n",
     "plt.show()"
    ]
@@ -279,4 +256,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}