【PaddlePaddle Hackathon】78 实现密度矩阵可视化

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【PaddlePaddle Hackathon】78 实现密度矩阵可视化

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New features

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Describe

• Task 【PaddlePaddle Hackathon】78 实现密度矩阵可视化 #14
• Add utils.plot_density_graph to Quantum (include test case and doc).

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@Quleaf

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@TCChenlong

[Quleaf]

使用以下代码测试，显示的图片会有bug。

import numpy as np
import paddle
from paddle_quantum.circuit import UAnsatz
from paddle_quantum.utils import plot_density_graph
import matplotlib.pyplot as plt

cir = UAnsatz(3)
rng = np.random.default_rng()
a = rng.random(size=[3, 3, 3])
a = paddle.to_tensor(a)
cir.complex_entangled_layer(a, 3)
cir.ry(paddle.to_tensor(1, dtype='float64'), 0)
state = cir.run_density_matrix()
figure = plot_density_graph(state)
plt.show()

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@Quleaf 感谢指正，已修复