fix symmetric walk op to use the block-encoding qfunc and not the walk itself

Author: TomerGoldfriend

applications/cfd/qls_for_hybrid_solvers/qls_chebyshev_lcu.ipynb

@@ -75,7 +75,7 @@
     "):\n",
     "    my_reflect_about_zero(block)\n",
     "    within_apply(\n",
-    "        lambda: walk_operator(block_enc, block, data),\n",
+    "        lambda: block_enc(block, data),\n",
     "        lambda: my_reflect_about_zero(block),\n",
     "    )\n",
     "\n",
@@ -291,9 +291,9 @@
       "Performing numpy Chebyshev interpolation, with degree 63\n",
       "Chebyshec LCU size: 5 qubits.\n",
       "Normalization factor for inversion: 0.5926349343907911\n",
-      "time to syn: 90.84944820404053\n",
-      "time to exe: 16.944632053375244\n",
-      "Quantum program link: https://platform.classiq.io/circuit/37T1FyqFCScVkg82dkN2DCMwwbi\n"
+      "time to syn: 68.76218581199646\n",
+      "time to exe: 18.693821907043457\n",
+      "Quantum program link: https://platform.classiq.io/circuit/39FLBk0fxtKjv8Uz1tHTbr1Hvxl\n"
      ]
     }
    ],
@@ -324,9 +324,9 @@
       "Performing numpy Chebyshev interpolation, with degree 63\n",
       "Chebyshec LCU size: 5 qubits.\n",
       "Normalization factor for inversion: 0.4151350173670834\n",
-      "time to syn: 119.41847610473633\n",
-      "time to exe: 23.28752899169922\n",
-      "Quantum program link: https://platform.classiq.io/circuit/37T1ZH62NbvjrOQ1k0N5khsvJwV\n"
+      "time to syn: 120.10498905181885\n",
+      "time to exe: 23.857552766799927\n",
+      "Quantum program link: https://platform.classiq.io/circuit/39FLRAeou4Sy4S25nbmooMIiuEf\n"
      ]
     }
    ],
@@ -351,7 +351,7 @@
     {
      "data": {
       "text/plain": [
-       "<matplotlib.legend.Legend at 0x12ec924d0>"
+       "<matplotlib.legend.Legend at 0x12d8e9c10>"
       ]
      },
      "execution_count": 10,