[BasicGates] Add links to the relevant tutorials

BasicGates/BasicGates.ipynb

@@ -36,10 +36,11 @@
    "source": [
     "## Part I. Single-Qubit Gates\n",
     "\n",
-    "\n",
     "### Theory\n",
     "\n",
-    "* A list of most common gates can be found in [this Wikipedia article](https://en.wikipedia.org/wiki/Quantum_logic_gate).\n",
+    "* [The qubit (tutorial)](./../tutorials/Qubit/Qubit.ipynb) introduces single-qubit systems and their states.\n",
+    "* [Single-qubit gates (tutorial)](./../tutorials/SingleQubitGates/SingleQubitGates.ipynb) covers single-qubit gates.\n",
+    "* [Multi-qubit systems (tutorial)](./../tutorials/MultiQubitSystems/MultiQubitSystems.ipynb) introduces multi-qubit systems (tasks 1.8-1.10).\n",
     "* [Quirk](http://algassert.com/quirk) is a convenient tool for visualizing the effect of gates on qubit states.\n",
     "\n",
     "### Q# materials\n",
@@ -316,11 +317,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "> The next three tasks deal with multi-qubit systems, though they still only require single-qubit gates.\n",
+    "> We recommend going through the [MultiQubitSystems tutorial](./../tutorials/MultiQubitSystems/MultiQubitSystems.ipynb) before attempting these.\n",
+    "\n",
     "### Task 1.8. Bell state change - 1\n",
     "\n",
     "**Input:** Two entangled qubits in Bell state $|\\Phi^{+}\\rangle = \\frac{1}{\\sqrt{2}} \\big(|00\\rangle + |11\\rangle\\big)$.\n",
     "\n",
-    "**Goal:**  Change the two-qubit state to $|\\Phi^{-}\\rangle = \\frac{1}{\\sqrt{2}} \\big(|00\\rangle - |11\\rangle\\big)$.\n"
+    "**Goal:**  Change the two-qubit state to $|\\Phi^{-}\\rangle = \\frac{1}{\\sqrt{2}} \\big(|00\\rangle - |11\\rangle\\big)$."
    ]
   },
   {
@@ -422,6 +426,10 @@
     "> \n",
     "> Note also that the states shown in test output use little-endian notation (similarly to `DumpMachine`), see this [tutorial section](../tutorials/MultiQubitSystems/MultiQubitSystems.ipynb#Endianness) for a refresher on endianness.\n",
     "\n",
+    "### Theory\n",
+    "\n",
+    "* [Multi-qubit gates (tutorial)](./../tutorials/MultiQubitGates/MultiQubitGates.ipynb) covers multi-qubit gates.\n",
+    "\n",
     "### Q# materials\n",
     "\n",
     "* Using controlled and adjoint versions of gates is covered in the Q# documentation on [operations](https://docs.microsoft.com/azure/quantum/user-guide/language/expressions/functorapplication)."