#
#  Import modules
#


from qiskit import QuantumCircuit
from qiskit.primitives import StatevectorSampler
from qiskit.visualization import plot_histogram
import matplotlib.pyplot as plt

#
#  Define quantum circuit
#


qc = QuantumCircuit(1)      #  initially |0>

qc.x(0)                     #  not |0> = |1>
qc.x(0)                     #  not not |0> = |0>

#  Measure value of all qbits:
qc.measure_all()


#
# Visualize circuit and resultss
#

qc.draw("mpl")

sampler = StatevectorSampler()
result = sampler.run([qc], shots=1024).result()
print(result[0].data.meas.get_counts())

counts = result[0].data.meas.get_counts()
plot_histogram(counts)
plt.show()