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   "source": [
    "# Introduction: Getting Started\n",
    "***"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Building a circuit\n",
    "Creating a circuit is exactly similar to the qiskit. Almost exact same command can be used as shown in the [tutorial](https://github.com/Qiskit/qiskit-tutorials/blob/master/qiskit/terra/quantum_circuits.ipynb). Few examples are given below."
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   "cell_type": "code",
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   "metadata": {},
   "outputs": [],
   "source": [
    "from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example 1 : Qubits and Classical bits"
   ]
  },
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       "<pre style=\"word-wrap: normal;white-space: pre;line-height: 15px;\">         \n",
       "q1_0: |0>\n",
       "         \n",
       "q1_1: |0>\n",
       "         \n",
       " c1_0: 0 \n",
       "         \n",
       " c1_1: 0 \n",
       "         </pre>"
      ],
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       "<qiskit.visualization.text.TextDrawing at 0x7fac6e61bfd0>"
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     "execution_count": 3,
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    }
   ],
   "source": [
    "q1 = QuantumRegister(2,'q1')\n",
    "c1 = ClassicalRegister(2,'c1')\n",
    "qc1 = QuantumCircuit(q1,c1)\n",
    "qc1.draw()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example 2 : Simple Gates"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<pre style=\"word-wrap: normal;white-space: pre;line-height: 15px;\">         ┌───┐          \n",
       "q2_0: |0>┤ S ├──■───────\n",
       "         └───┘┌─┴─┐┌───┐\n",
       "q2_1: |0>─────┤ X ├┤ H ├\n",
       "              └───┘└───┘</pre>"
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       "<qiskit.visualization.text.TextDrawing at 0x7fac6ff54978>"
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     "execution_count": 5,
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   ],
   "source": [
    "q2 = QuantumRegister(2,'q2')\n",
    "qc2 = QuantumCircuit(q2)\n",
    "qc2.s(q2[0])\n",
    "qc2.cx(q2[0],q2[1])\n",
    "qc2.h(q2[1])\n",
    "qc2.draw()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example 3 : "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<pre style=\"word-wrap: normal;white-space: pre;line-height: 15px;\">        ┌───┐          \n",
       "q_0: |0>┤ S ├──■───────\n",
       "        └───┘┌─┴─┐┌───┐\n",
       "q_1: |0>─────┤ X ├┤ H ├\n",
       "             └───┘└───┘</pre>"
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     "execution_count": 12,
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    }
   ],
   "source": [
    "qc3 = QuantumCircuit(2)\n",
    "qc3.s(0)\n",
    "qc3.cx(0,1)\n",
    "qc3.h(1)\n",
    "qc3.draw()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example 4 : More gates"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<pre style=\"word-wrap: normal;white-space: pre;line-height: 15px;\">        ┌───┐           ░ ┌──────────┐     ┌─┐   \n",
       "q_0: |0>┤ S ├──■────────░─┤ U1(3.14) ├──■──┤M├───\n",
       "        └───┘┌─┴─┐┌───┐ ░ └──────────┘┌─┴─┐└╥┘┌─┐\n",
       "q_1: |0>─────┤ X ├┤ H ├─░─────────────┤ X ├─╫─┤M├\n",
       "             └───┘└───┘ ░             └───┘ ║ └╥┘\n",
       " c_0: 0 ════════════════════════════════════╩══╬═\n",
       "                                               ║ \n",
       " c_1: 0 ═══════════════════════════════════════╩═\n",
       "                                                 </pre>"
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       "<qiskit.visualization.text.TextDrawing at 0x7fac6dcd6a20>"
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     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "qc4 = QuantumCircuit(2,2)\n",
    "qc4.s(0)\n",
    "qc4.cx(0,1)\n",
    "qc4.h(1)\n",
    "qc4.barrier()\n",
    "qc4.u1(3.14,0)\n",
    "qc4.cx(0,1)\n",
    "qc4.measure(0,0)\n",
    "qc4.measure(1,1)\n",
    "qc4.draw()"
   ]
  }
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