Man and History: Python 量子運算（九）：半角

2022年12月18日星期日

Python 量子運算（九）：半角

2022/12/05

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Fig. 9.1. Half angle.

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代碼 9.1

# Program 9.1：Half angle
import matplotlib as mpl
import matplotlib.pyplot as plt

# figure setting
mpl.rcParams['text.usetex'] = True
mpl.rcParams['text.latex.preamble'] = r'\usepackage{{amsmath}}'
mpl.rcParams['font.size'] = 80
fig, ax = plt.subplots(figsize=(16, 16))

# string setting
s1_1 = r'$\vert\psi\rangle$'
s1_2 = r'$=\cos\frac{\theta}{2}\ \vert0\rangle'\
       r'+e^{i\phi}\sin\frac{\theta}{2}\ \vert1\rangle$'

s2 = r'$=\begin{bmatrix}\cos\frac{\theta}{2}\\'\
     r'\ e^{i\phi}\sin\frac{\theta}{2}\ \end{bmatrix}$'

s3 = r'$(0\leq\theta\leq\pi,\ 0\leq\phi<2\pi)$'

# string output
ax.text(0.10, 0.75, s1_1)
ax.text(0.25, 0.75, s1_2)
ax.text(0.25, 0.45, s2)
ax.text(0.10, 0.15, s3)
ax.set_axis_off()

# plt.savefig('/content/drive/My Drive/pqc/0009_001.png')
plt.show()