qiskit-documentation/docs/api/qiskit/0.29/qiskit.ignis.verification.BConfig.mdx

---
title: BConfig (v0.29)
description: API reference for qiskit.ignis.verification.BConfig in qiskit v0.29
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.ignis.verification.BConfig
---

# BConfig

<Class id="qiskit.ignis.verification.BConfig" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/verification/entanglement/parallelize.py" signature="BConfig(backend, indicator=True)" modifiers="class">
  Bases: `object`

  This class is used to create a GHZ circuit with parallellized CNOT gates to increase fidelity

  ## Methods

  <span id="qiskit-ignis-verification-bconfig-get-ghz-layout" />

  ### get\_ghz\_layout

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_layout" signature="BConfig.get_ghz_layout(n, transpiled=True, barriered=True)">
    Feeds the Tier Dict of the backend to create a basic qiskit GHZ circuit with no measurement; :type n: `int` :param n: number of qubits :type transpiled: `bool` :param transpiled: toggle on/off transpilation - useful for tomography :type barriered: `bool` :param barriered: yes/no whether to barrier each step of CNOT gates

    **Return type**

    `Tuple`\[`QuantumCircuit`, `Dict`]

    **Returns**

    A GHZ Circuit and its initial GHZ layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-ghz-mqc" />

  ### get\_ghz\_mqc

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_mqc" signature="BConfig.get_ghz_mqc(n, delta, full_measurement=True)">
    This function creates an MQC circuit with n qubits, where the middle phase rotation around the z axis is by delta

    **Parameters**

    *   **n** (`int`) – number of qubits
    *   **delta** (`float`) – the rotation of the middle phase around the z axis
    *   **full\_measurement** (`bool`) – Whether to append full measurement, or only on the first qubit

    **Return type**

    `Tuple`\[`QuantumCircuit`, `Dict`]

    **Returns**

    The MQC circuit and the initial GHZ layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-ghz-mqc-para" />

  ### get\_ghz\_mqc\_para

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_mqc_para" signature="BConfig.get_ghz_mqc_para(n, full_measurement=True)">
    Get a parametrized MQC circuit. Remember that get\_counts() method accepts an index now, not a circuit

    **Parameters**

    *   **n** (`int`) – number of qubits
    *   **full\_measurement** (`bool`) – Whether to append full measurement, or only on the first qubit

    **Return type**

    `Tuple`\[`QuantumCircuit`, `Parameter`, `Dict`]

    **Returns**

    The MQC circuit, its delta parameter, and the initial GHZ layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-ghz-po" />

  ### get\_ghz\_po

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_po" signature="BConfig.get_ghz_po(n, delta)">
    This function creates an Parity Oscillation circuit with n qubits, where the middle superposition rotation around the x and y axes is by delta

    **Parameters**

    *   **n** (`int`) – number of qubits
    *   **delta** (`float`) – the middle superposition rotation

    **Return type**

    `Tuple`\[`QuantumCircuit`, `Dict`]

    **Returns**

    The Parity Oscillation circuit and the initial GHZ layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-ghz-po-para" />

  ### get\_ghz\_po\_para

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_po_para" signature="BConfig.get_ghz_po_para(n)">
    Get a parametrized PO circuit. Remember that get\_counts() method accepts an index now, not a circuit. The two phase parameters are a quirk of the Parameter module

    **Parameters**

    **n** (`int`) – number of qubits

    **Return type**

    `Tuple`\[`QuantumCircuit`, `List`\[`Parameter`], `Dict`]

    **Returns**

    **A parity oscillation circuit, its Delta/minus-delta parameters,**

    and the initial ghz layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-ghz-simple" />

  ### get\_ghz\_simple

  <Function id="qiskit.ignis.verification.BConfig.get_ghz_simple" signature="BConfig.get_ghz_simple(n, full_measurement=True)">
    Get simple GHZ circuit with measurement

    **Parameters**

    *   **n** (`int`) – number of qubits
    *   **full\_measurement** (`bool`) – Whether to append full measurement, or only on the first qubit

    **Return type**

    `Tuple`\[`QuantumCircuit`, `QuantumRegister`, `Dict`]

    **Returns**

    A GHZ Circuit, its measurement circle quantum register and the initial GHZ layout
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-measurement-circ" />

  ### get\_measurement\_circ

  <Function id="qiskit.ignis.verification.BConfig.get_measurement_circ" signature="BConfig.get_measurement_circ(n, qregname, cregname, full_measurement=True)">
    Creates a measurement circuit that can toggle between measuring the control qubit or measuring all qubits. The default is measurement of all qubits.

    **Parameters**

    *   **n** (`int`) – number of qubits
    *   **qregname** (`str`) – name of the qubit register
    *   **cregname** (`str`) – name of the classical register
    *   **full\_measurement** (`bool`) – Whether to append full measurement, or only on the first qubit

    **Return type**

    `QuantumCircuit`

    **Returns**

    The measurement circuit
  </Function>

  <span id="qiskit-ignis-verification-bconfig-get-tier-dict" />

  ### get\_tier\_dict

  <Function id="qiskit.ignis.verification.BConfig.get_tier_dict" signature="BConfig.get_tier_dict()">
    Take the nodes of the BConfig to create a Tier Dictionary, where keys are the steps in the process, and the values are the connections following pattern of: \[controlled qubit, NOT qubit]. Thus the backend’s GHZ state is parallelized.

    **Return type**

    `Dict`

    **Returns**

    **Tier dictionary - \[step in process, control-target connection]**

    Facilitates parallelized GHZ circuits
  </Function>
</Class>