{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "a3efd224",
   "metadata": {},
   "source": [
    "# 20 - OpenQASM Interoperability\n",
    "\n",
    "Export and import circuits in OpenQASM 2.0 format.\n",
    "\n",
    "**Concepts:** OpenQASM, to_openqasm, from_openqasm, cross-platform"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "0452efc4",
   "metadata": {},
   "outputs": [],
   "source": [
    "import quantsdk as qs"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "dc2ac7f6",
   "metadata": {},
   "source": [
    "## Export to OpenQASM"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5103de4e",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Build a Bell state circuit\n",
    "circuit = qs.Circuit(2, name=\"bell\")\n",
    "circuit.h(0).cx(0, 1).measure_all()\n",
    "\n",
    "# Export to OpenQASM\n",
    "qasm = circuit.to_openqasm()\n",
    "print(\"OpenQASM 2.0 output:\")\n",
    "print(qasm)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "555d30a3",
   "metadata": {},
   "outputs": [],
   "source": [
    "# More complex circuit\n",
    "circuit = qs.Circuit(3, name=\"complex\")\n",
    "circuit.h(0).cx(0, 1).ry(2, 1.5708).cz(1, 2)\n",
    "circuit.rx(0, 0.7854).t(1).s(2)\n",
    "circuit.measure_all()\n",
    "\n",
    "qasm = circuit.to_openqasm()\n",
    "print(qasm)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "14ec93f2",
   "metadata": {},
   "source": [
    "## Import from OpenQASM"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5f44e5fb",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Parse OpenQASM string into a QuantSDK circuit\n",
    "qasm_str = \"\"\"OPENQASM 2.0;\n",
    "include \"qelib1.inc\";\n",
    "qreg q[2];\n",
    "creg c[2];\n",
    "h q[0];\n",
    "cx q[0],q[1];\n",
    "measure q[0] -> c[0];\n",
    "measure q[1] -> c[1];\n",
    "\"\"\"\n",
    "\n",
    "imported = qs.Circuit.from_openqasm(qasm_str)\n",
    "print(f\"Imported circuit: {imported.num_qubits} qubits, {imported.gate_count} gates\")\n",
    "print(f\"Ops: {imported.count_ops()}\")\n",
    "\n",
    "# Run the imported circuit\n",
    "result = qs.run(imported, shots=1000, seed=42)\n",
    "print(f\"Result: {result.counts}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7ad55ad2",
   "metadata": {},
   "source": [
    "## Round-Trip"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "eb2acd39",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Build -> QASM -> Parse -> Run\n",
    "original = qs.Circuit(2)\n",
    "original.h(0).cx(0, 1).measure_all()\n",
    "\n",
    "# Round trip\n",
    "qasm = original.to_openqasm()\n",
    "roundtrip = qs.Circuit.from_openqasm(qasm)\n",
    "\n",
    "# Compare\n",
    "r1 = qs.run(original, shots=2000, seed=42)\n",
    "r2 = qs.run(roundtrip, shots=2000, seed=42)\n",
    "\n",
    "print(\"Round-trip validation:\")\n",
    "print(f\"  Original: {r1.counts}\")\n",
    "print(f\"  Roundtrip: {r2.counts}\")\n",
    "print(f\"  Match: {r1.counts == r2.counts}\")"
   ]
  }
 ],
 "metadata": {
  "language_info": {
   "name": "python"
  }
 },
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 "nbformat_minor": 5
}