plot_state_qsphere¶
- plot_state_qsphere(rho, figsize=None, ax=None)[source]¶
Plot the qsphere representation of a quantum state. Here, the size of the points is proportional to the probability of the corresponding term in the state and the color represents the phase.
- Parameters
rho (ndarray) – State vector or density matrix representation. of quantum state.
figsize (tuple) – Figure size in inches.
ax (matplotlib.axes.Axes) – An optional Axes object to be used for the visualization output. If none is specified a new matplotlib Figure will be created and used. Additionally, if specified there will be no returned Figure since it is redundant.
- Returns
A matplotlib figure instance if the
ax
kwag is not set- Return type
Figure
- Raises
ImportError – Requires matplotlib.
Example
from qiskit import QuantumCircuit, BasicAer, execute from qiskit.visualization import plot_state_qsphere %matplotlib inline qc = QuantumCircuit(2, 2) qc.h(0) qc.cx(0, 1) qc.measure([0, 1], [0, 1]) backend = BasicAer.get_backend('statevector_simulator') job = execute(qc, backend).result() plot_state_qsphere(job.get_statevector(qc))