Merge pull request #18 from oqtopus-team/docs/buildin-types

docs: add explanations of build-in types

docs/usage/how_it_works.ipynb

@@ -150,7 +150,7 @@
     "For details on the built-in components, refer to [Built-in Components](#built-in-components).\n",
     "\n",
     "Furthermore, you can set custom transpilers, custom programs, and custom devices that you have created.\n",
-    "For details on how to create and use custom options, refer to [Using Custom Transpilers and Converters](/usage/custom)."
+    "For details on how to create and use custom options, refer to [Using Custom Transpilers and Converters](../custom)."
    ]
   },
   {
@@ -164,14 +164,17 @@
     "### Step 1: Fetch the transpiler library\n",
     "The transpilers available in Tranqu are registered in the `TranspilerManager` class.  \n",
     "Using the `transpiler_lib` argument, the appropriate transpiler library is fetched from the `TranspilerManager`.\n",
+    "If the `default_transpiler_lib` is set, the `transpiler_lib` argument can be omitted.\n",
     "\n",
     "### Step 2: Fetch the `ProgramConverter`\n",
     "Tranqu uses the `ProgramConverter` class to convert the format of the input program.  \n",
     "To transform the input program into a format that can be processed by the specified transpiler, the appropriate `ProgramConverter` is fetched from the `ProgramConverterManager` class using the `program_lib` and `transpiler_lib` arguments.\n",
+    "If the `program_type` is set, the `program_lib` argument can be omitted.\n",
     "\n",
     "### Step 3: Fetch the `DeviceConverter`\n",
     "Tranqu uses the `DeviceConverter` class to convert the format of the input device information.  \n",
     "To transform the input device information into a format that can be processed by the specified transpiler, the appropriate `DeviceConverter` is fetched from the `DeviceConverterManager` class using the `device_lib` and `transpiler_lib` arguments.  \n",
+    "If the `device_type` is set, the `device_lib` argument can be omitted.\n",
     "\n",
     "If `device_lib` is not set, this step is skipped.\n",
     "\n",
@@ -206,11 +209,6 @@
     "| `\"qiskit\"`         | Transpile quantum circuits using Qiskit. |"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": []
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -241,7 +239,35 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": []
+   "source": [
+    "## Built-in types\n",
+    "\n",
+    "When `Tranqu` class is instantiated, it automatically registers `program_type`, and `device_type` to their respective Managers.  \n",
+    "These components are referred to as \"built-in types.\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Table 4: Built-in `program_type`\n",
+    "\n",
+    "| Program Library | Type                    |\n",
+    "|-----------------|-------------------------|\n",
+    "| `\"qiskit\"`      | `qiskit.QuantumCircuit` |\n",
+    "| `\"tket\"`        | `pytket.Circuit`        |\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Table 5: Built-in `device_type`\n",
+    "\n",
+    "| Device Library | Type                         |\n",
+    "|----------------|------------------------------|\n",
+    "| `\"qiskit\"`     | `qiskit.providers.BackendV2` |"
+   ]
   }
  ],
  "metadata": {