59 lines
2.8 KiB
Plaintext
59 lines
2.8 KiB
Plaintext
---
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title: plot_state_hinton
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description: API reference for qiskit.visualization.plot_state_hinton
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.visualization.plot_state_hinton
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---
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# qiskit.visualization.plot\_state\_hinton
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<Function id="qiskit.visualization.plot_state_hinton" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.21/qiskit/visualization/state_visualization.py" signature="plot_state_hinton(state, title='', figsize=None, ax_real=None, ax_imag=None, *, rho=None, filename=None)">
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Plot a hinton diagram for the density matrix of a quantum state.
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The hinton diagram represents the values of a matrix using squares, whose size indicate the magnitude of their corresponding value and their color, its sign. A white square means the value is positive and a black one means negative.
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**Parameters**
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* **state** ([*Statevector*](qiskit.quantum_info.Statevector "qiskit.quantum_info.Statevector") *or*[*DensityMatrix*](qiskit.quantum_info.DensityMatrix "qiskit.quantum_info.DensityMatrix") *or ndarray*) – An N-qubit quantum state.
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* **title** (*str*) – a string that represents the plot title
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* **figsize** (*tuple*) – Figure size in inches.
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* **filename** (*str*) – file path to save image to.
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* **ax\_real** (*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. If this is specified without an ax\_imag only the real component plot will be generated. Additionally, if specified there will be no returned Figure since it is redundant.
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* **ax\_imag** (*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. If this is specified without an ax\_imag only the real component plot will be generated. Additionally, if specified there will be no returned Figure since it is redundant.
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**Returns**
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The matplotlib.Figure of the visualization if neither ax\_real or ax\_imag is set.
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**Return type**
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matplotlib.Figure
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**Raises**
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* **MissingOptionalLibraryError** – Requires matplotlib.
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* [**VisualizationError**](qiskit.visualization.VisualizationError "qiskit.visualization.VisualizationError") – if input is not a valid N-qubit state.
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**Examples**
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```python
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import numpy as np
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from qiskit import QuantumCircuit
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from qiskit.quantum_info import DensityMatrix
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from qiskit.visualization import plot_state_hinton
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qc = QuantumCircuit(2)
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qc.h([0, 1])
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qc.cz(0,1)
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qc.ry(np.pi/3 , 0)
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qc.rx(np.pi/5, 1)
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state = DensityMatrix(qc)
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plot_state_hinton(state, title="New Hinton Plot")
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```
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</Function>
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