qiskit.visualization.plot_bloch_multivector

plot_bloch_multivector(state, title='', figsize=None, *, rho=None)

Plot the Bloch sphere.

Plot a sphere, axes, the Bloch vector, and its projections onto each axis.

Parameters

• state (Statevector orDensityMatrix or ndarray) – an N-qubit quantum state.
• title (str) – a string that represents the plot title
• figsize (tuple) – Has no effect, here for compatibility only.

Returns

A matplotlib figure instance.

Return type

matplotlib.Figure

Raises

• ImportError – Requires matplotlib.
• VisualizationError – if input is not a valid N-qubit state.

Example

from qiskit import QuantumCircuit
from qiskit.quantum_info import Statevector
from qiskit.visualization import plot_bloch_multivector
%matplotlib inline
 
qc = QuantumCircuit(2)
qc.h(0)
qc.cx(0, 1)
 
state = Statevector.from_instruction(qc)
plot_bloch_multivector(state, title="New Bloch Multivector")