from matplotlib import pyplot as plt
import numpy as np
from qiskit import *
from qiskit.visualization import plot_bloch_vector

plt.figure()
ax = plt.gca()
ax.quiver([3], [5], angles='xy', scale_units='xy', scale=1)
ax.set_xlim([-1, 10])
ax.set_ylim([-1, 10])
plt.draw()
plt.show()

plot_bloch_vector([1, 0, 0])

plot_bloch_vector([0, 0, 0])