qiskit.visualization.plot_bloch_multivector¶
- plot_bloch_multivector(state, title='', figsize=None, *, rho=None, reverse_bits=False, filename=None, font_size=None, title_font_size=None, title_pad=1)[Quellcode]¶
Plot a Bloch sphere for each qubit.
Each component \((x,y,z)\) of the Bloch sphere labeled as ‚qubit i‘ represents the expected value of the corresponding Pauli operator acting only on that qubit, that is, the expected value of \(I_{N-1} \otimes\dotsb\otimes I_{i+1}\otimes P_i \otimes I_{i-1}\otimes\dotsb\otimes I_0\), where \(N\) is the number of qubits, \(P\in \{X,Y,Z\}\) and \(I\) is the identity operator.
Veraltet ab Version 0.15.1: plot_bloch_multivector keyword argument rho is deprecated and replaced with state.
- Parameter
state (Statevector or DensityMatrix or ndarray) – an N-qubit quantum state.
title (str) – a string that represents the plot title
figsize (tuple) – size of each individual Bloch sphere figure, in inches.
reverse_bits (bool) – If True, plots qubits following Qiskit’s convention [Default:False].
font_size (float) – Font size for the Bloch ball figures.
title_font_size (float) – Font size for the title.
title_pad (float) – Padding for the title (suptitle y position is y=1+title_pad/100).
- Rückgabe
A matplotlib figure instance.
- Rückgabetyp
matplotlib.Figure
- Verursacht
MissingOptionalLibraryError – Requires matplotlib.
VisualizationError – if input is not a valid N-qubit state.
Examples
from qiskit import QuantumCircuit from qiskit.quantum_info import Statevector from qiskit.visualization import plot_bloch_multivector qc = QuantumCircuit(2) qc.h(0) qc.x(1) state = Statevector(qc) plot_bloch_multivector(state)
from qiskit import QuantumCircuit from qiskit.quantum_info import Statevector from qiskit.visualization import plot_bloch_multivector qc = QuantumCircuit(2) qc.h(0) qc.x(1) # You can reverse the order of the qubits. from qiskit.quantum_info import DensityMatrix qc = QuantumCircuit(2) qc.h([0, 1]) qc.t(1) qc.s(0) qc.cx(0,1) matrix = DensityMatrix(qc) plot_bloch_multivector(matrix, title='My Bloch Spheres', reverse_bits=True)