LayerError

class LayerError(circuit, qubits, error=None)

GitHub

The error channel (in Pauli-Lindblad format) of a single layer of instructions.

Parameters

circuit (QuantumCircuit) – A circuit whose noise has been learnt.
qubits (Sequence[int]) – The labels of the qubits in the circuit.
error (Optional[PauliLindbladError]) – The Pauli Lindblad error channel affecting the circuit, or None if the error channel is either unknown or explicitly disabled.

Raises

ValueError – If circuit, qubits, and error have mismatching number of qubits.

Attributes

circuit

The circuit in this LayerError.

Return type

QuantumCircuit

error

The error channel in this LayerError, or None if the error channel is either unknown or explicitly disabled.

Return type

Optional[PauliLindbladError]

generators

(DEPRECATED) The Pauli Lindblad generators of the error channel in this LayerError.

Return type

PauliList

num_qubits

The number of qubits in this LayerError.

Return type

int

qubits

The qubits in this LayerError.

Return type

list[int]

rates

(DEPRECATED) The Lindblad generator rates of the error channel in this LayerError.

Return type

ndarray[Any, dtype[float64]]

Methods

draw_map

draw_map(embedding, colorscale='Bluered', color_no_data='lightgray', color_out_of_scale='lightgreen', num_edge_segments=16, edge_width=4, height=500, highest_rate=None, background_color='white', radius=0.25, width=800)

GitHub

Draw a map view of a this layer error.

Parameters

embedding (Union[Embedding, BackendV2]) – An Embedding object containing the coordinates and coupling map to draw the layer error on, or a backend to generate an Embedding for.
colorscale (str) – The colorscale used to show the rates of this layer error.
color_no_data (str) – The color used for qubits and edges for which no data is available.
color_out_of_scale (str) – The color used for rates with value greater than highest_rate.
num_edge_segments (int) – The number of equal-sized segments that edges are made of.
edge_width (float) – The line width of the edges in pixels.
height (int) – The height of the returned figure.
highest_rate (Optional[float]) – The highest rate, used to normalize all other rates before choosing their colors. If None, it defaults to the highest value found in the layer_error.
background_color (str) – The background color.
radius (float) – The radius of the pie charts representing the qubits.
width (int) – The width of the returned figure.
code: (..) –

python: from qiskit import QuantumCircuit from qiskit.quantum_info import PauliList from qiskit_ibm_runtime.utils.embeddings import Embedding from qiskit_ibm_runtime.utils.noise_learner_result import LayerError, PauliLindbladError

# A five-qubit 1-D embedding with nearest neighbouring connectivity coordinates1 = [(0, 0), (0, 1), (0, 2), (0, 3), (0, 4), (0, 5)] coupling_map1 = [(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)] embedding1 = Embedding(coordinates1, coupling_map1)

# A six-qubit horseshoe-shaped embedding with nearest neighbouring connectivity coordinates2 = [(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2)] coupling_map2 = [(0, 1), (1, 2), (0, 3), (3, 4), (4, 5)] embedding2 = Embedding(coordinates2, coupling_map2)

# A LayerError object circuit = QuantumCircuit(4) qubits = [1, 2, 3, 4] generators = PauliList([“IIIX”, “IIXI”, “IXII”, “YIII”, “ZIII”, “XXII”, “ZZII”]) rates = [0.01, 0.01, 0.01, 0.005, 0.02, 0.01, 0.01] error = PauliLindbladError(generators, rates) layer_error = LayerError(circuit, qubits, error)

# Draw the layer error on embedding1 layer_error.draw_map(embedding1)

# Draw the layer error on embedding2 layer_error.draw_map(embedding2)

Return type

Figure

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