replace reflect_about_zero in walk operators in notebooks

Author: orsa-classiq

algorithms/hamiltonian_simulation/hamiltonian_simulation_with_block_encoding/hamiltonian_simulation_with_block_encoding.ipynb

@@ -477,8 +477,7 @@
     "    be_qfunc: QCallable[BlockEncodedState], state: BlockEncodedState\n",
     ") -> None:\n",
     "    be_qfunc(state)\n",
-    "    reflect_about_zero(state.block)\n",
-    "    phase(pi)"
+    "    control(state.block == 0, lambda: phase(pi))"
    ]
   },
   {

algorithms/quantum_phase_estimation/qpe_with_qubitization/qpe_for_molecule_with_qubitization.ipynb

@@ -363,8 +363,7 @@
     "    be_qfunc: QCallable[BlockEncodedState], state: BlockEncodedState\n",
     ") -> None:\n",
     "    be_qfunc(state)\n",
-    "    reflect_about_zero(state.block)\n",
-    "    phase(pi)"
+    "    control(state.block == 0, lambda: phase(pi))"
    ]
   },
   {
@@ -593,7 +592,7 @@
     "        iteration=lambda i: within_apply(\n",
     "            lambda: control(\n",
     "                phase_var[i + 1] == 0,\n",
-    "                lambda: [reflect_about_zero(state.block), phase(pi)],\n",
+    "                lambda: control(state.block == 0, lambda: phase(pi)),\n",
     "            ),\n",
     "            lambda: power(2**i, lambda: walk_operator(block_encoding, state)),\n",
     "        ),\n",

applications/cfd/qls_for_hybrid_solvers/qls_chebyshev_lcu.ipynb

@@ -55,10 +55,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "from classiq.qmod.symbolic import pi\n",
+    "\n",
+    "\n",
     "@qfunc\n",
     "def my_reflect_about_zero(qba: QArray):\n",
-    "    reflect_about_zero(qba)\n",
-    "    RY(2 * np.pi, qba[0])\n",
+    "    control(qba == 0, lambda: phase(pi))\n",
     "\n",
     "\n",
     "@qfunc\n",