diff --git a/exercises/01_exercise.ipynb b/exercises/01_exercise.ipynb
index 20a5d99..3675365 100644
--- a/exercises/01_exercise.ipynb
+++ b/exercises/01_exercise.ipynb
@@ -359,6 +359,61 @@
    "outputs": [],
    "source": []
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Problem 4: Create mini magic Quantum Circuit (Superposition + Phase + Entanglement) "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Q: Create a quantum circuit which consist of a 2-qubit quantum register and a 2-bit classical register. "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  },
+{
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Q: Apply a **Hadamard gate** to the first qubit to create superposition ,then apply a **controlled X-gate** between the two qubit to introduced entanglement "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Q:  Apply a **phase rotation** of pi/4 to first qubit using a **phase gate**,then measure both qubit "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "markdown",
    "metadata": {},