quantum-phase-estimation.ipynb

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   "source": [
    "# Initial QPE Circuit Baysian version."
   ]
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   "source": [
    "class bayesian_qpe_builder():\n",
    "    # Importing libraries.\n",
    "    from pytket.circuit import Circuit\n",
    "    from pytket.circuit import CircBox\n",
    "    from pytket.circuit import QControlBox\n",
    "    from pytket.circuit.display import render_circuit_jupyter\n",
    "    \n",
    "    def __init__(self, in_qubits, m_qubits, input_angle=1, z_angle=0, m=1):\n",
    "        # Initializing the circuit.\n",
    "        self.bayesian_qpe_circ: Circuit = Circuit()\n",
    "\n",
    "        # Variables.\n",
    "        self.m = m\n",
    "        self.in_qubits = in_qubits\n",
    "        self.m_qubits = m_qubits\n",
    "        self.input_angle = input_angle\n",
    "        self.z_angle = z_angle\n",
    "        \n",
    "        # Creating the initial qubits.\n",
    "        initial_state = Circuit(in_qubits).X(0)  # Initial state of the circuit (|psi>).\n",
    "\n",
    "        # Creating the unitary gate.\n",
    "        unitary_control = Circuit(m_qubits).U1(input_angle, 0)  # Unitary control gate.\n",
    "        unitary_control.name = \"U\"\n",
    "        controlled_u_gate = QControlBox(CircBox(unitary_control), 1)\n",
    "        \n",
    "        # Initiate the measurement qubit.\n",
    "        measurement_register = self.bayesian_qpe_circ.add_q_register(\"|0>\", m_qubits)\n",
    "        # Initiate the initial state.\n",
    "        state_prep_register = self.bayesian_qpe_circ.add_q_register(\"psi\", in_qubits)\n",
    "\n",
    "        # Adding tha Hadamard gate.\n",
    "        for m_qubit in measurement_register:\n",
    "            self.bayesian_qpe_circ.H(m_qubit)\n",
    "\n",
    "        # Build the circuit.\n",
    "        self.bayesian_qpe_circ.add_circuit(initial_state, list(state_prep_register))\n",
    "        \n",
    "        # Adding the U-Control gate.\n",
    "        for m_qubit in range(m_qubits):\n",
    "            control_index = m_qubits - m_qubit - 1 # Contrtoling the index of the qubit.\n",
    "            control_qubit = [measurement_register[control_index]] # Controling WHICH qubit.\n",
    "            for _ in range(2**m):\n",
    "                self.bayesian_qpe_circ.add_qcontrolbox(\n",
    "                    controlled_u_gate, control_qubit + list(state_prep_register)\n",
    "                )\n",
    "\n",
    "        # Adding the Rz and Hadamard.\n",
    "        for m_qubit in measurement_register:\n",
    "            self.bayesian_qpe_circ.Rz(z_angle, m_qubit)\n",
    "\n",
    "        for m_qubit in measurement_register:\n",
    "            self.bayesian_qpe_circ.H(m_qubit)\n",
    "        \n",
    "        return render_circuit_jupyter(self.bayesian_qpe_circ)\n",
    "            \n",
    "        \n",
    "bayesian_qpe = bayesian_qpe_builder(1, 1, m=0)"
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