def process_data(rho):
""" Sort rho data """
result = dict()
num = int(np.log2(len(rho)))
labels = list(map(lambda x: x.to_label(), pauli_group(num)))
values = list(map(lambda x: np.real(np.trace(np.dot(x.to_matrix(), rho))),
pauli_group(num)))
for position, label in enumerate(labels):
result[label] = values[position]
return result
def plot_state_paulivec(rho, title="", figsize=None, color=None):
"""Plot the paulivec representation of a quantum state.
Plot a bargraph of the mixed state rho over the pauli matrices
Args:
rho (ndarray): Numpy array for state vector or density matrix
title (str): a string that represents the plot title
figsize (tuple): Figure size in inches.
color (list or str): Color of the expectation value bars.
Returns:
matplotlib.Figure: The matplotlib.Figure of the visualization
Raises:
ImportError: Requires matplotlib.
"""
if not HAS_MATPLOTLIB:
raise ImportError('Must have Matplotlib installed.')
rho = _validate_input_state(rho)
if figsize is None:
figsize = (7, 5)
num = int(np.log2(len(rho)))
labels = list(map(lambda x: x.to_label(), pauli_group(num)))
values = list(
map(lambda x: np.real(np.trace(np.dot(x.to_matrix(), rho))),
pauli_group(num)))
numelem = len(values)
if color is None:
color = "#648fff"
ind = np.arange(numelem) # the x locations for the groups
width = 0.5 # the width of the bars
fig, ax = plt.subplots(figsize=figsize)
ax.grid(zorder=0, linewidth=1, linestyle='--')
ax.bar(ind, values, width, color=color, zorder=2)
ax.axhline(linewidth=1, color='k')
# add some text for labels, title, and axes ticks
ax.set_ylabel('Expectation value', fontsize=14)
ax.set_xticks(ind)
ax.set_yticks([-1, -0.5, 0, 0.5, 1])
ax.set_xticklabels(labels, fontsize=14, rotation=70)
ax.set_xlabel('Pauli', fontsize=14)
ax.set_ylim([-1, 1])
ax.set_facecolor('#eeeeee')
for tick in ax.xaxis.get_major_ticks() + ax.yaxis.get_major_ticks():
tick.label.set_fontsize(14)
ax.set_title(title, fontsize=16)
plt.close(fig)
return fig
def plot_state_paulivec(rho, title="", filename=None, show=False):
"""Plot the paulivec representation of a quantum state.
Plot a bargraph of the mixed state rho over the pauli matrices
Args:
rho (np.array[[complex]]): array of dimensions 2**n x 2**nn complex
numbers
title (str): a string that represents the plot title
filename (str): the output file to save the plot as. If specified it
will save and exit and not open up the plot in a new window.
show (bool): If set to true the rendered image will open in a new
window
Returns:
matplotlib.Figure: The matplotlib.Figure of the visualization
"""
num = int(np.log2(len(rho)))
labels = list(map(lambda x: x.to_label(), pauli_group(num)))
values = list(
map(lambda x: np.real(np.trace(np.dot(x.to_matrix(), rho))),
pauli_group(num)))
numelem = len(values)
ind = np.arange(numelem) # the x locations for the groups
width = 0.5 # the width of the bars
_, ax = plt.subplots()
ax.grid(zorder=0)
ax.bar(ind, values, width, color='seagreen')
# add some text for labels, title, and axes ticks
ax.set_ylabel('Expectation value', fontsize=12)
ax.set_xticks(ind)
ax.set_yticks([-1, -0.5, 0, 0.5, 1])
ax.set_xticklabels(labels, fontsize=12, rotation=70)
ax.set_xlabel('Pauli', fontsize=12)
ax.set_ylim([-1, 1])
plt.title(title)
if filename:
plt.savefig(filename)
elif show:
plt.show()
return plt.gcf()