# -*- coding: utf-8 -*-
# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2018.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
"""
Paulivec visualization
"""
from string import Template
import sys
import time
import re
import numpy as np
from qiskit.quantum_info.operators.pauli import pauli_group
from qiskit.visualization.utils import _validate_input_state
if ('ipykernel' in sys.modules) and ('spyder' not in sys.modules):
try:
from IPython.core.display import display, HTML
except ImportError:
print("Error importing IPython.core.display. To install, run "
'"pip install ipython".')
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
[docs]def iplot_state_paulivec(rho, figsize=None, slider=False, show_legend=False):
""" Create a paulivec representation.
Graphical representation of the input array.
Args:
rho (array): State vector or density matrix.
figsize (tuple): Figure size in pixels.
slider (bool): activate slider
show_legend (bool): show legend of graph content
Example:
.. code-block::
from qiskit import QuantumCircuit, BasicAer, execute
from qiskit.visualization import iplot_state_paulivec
%matplotlib inline
qc = QuantumCircuit(2, 2)
qc.h(0)
qc.cx(0, 1)
qc.measure([0, 1], [0, 1])
backend = BasicAer.get_backend('statevector_simulator')
job = execute(qc, backend).result()
iplot_state_paulivec(job.get_statevector(qc))
"""
# HTML
html_template = Template("""
<p>
<div id="paulivec_$divNumber"></div>
</p>
""")
# JavaScript
javascript_template = Template("""
<script>
requirejs.config({
paths: {
qVisualization: "https://qvisualization.mybluemix.net/q-visualizations"
}
});
require(["qVisualization"], function(qVisualizations) {
qVisualizations.plotState("paulivec_$divNumber",
"paulivec",
$executions,
$options);
});
</script>
""")
rho = _validate_input_state(rho)
# set default figure size if none given
if figsize is None:
figsize = (7, 5)
options = {'width': figsize[0], 'height': figsize[1],
'slider': int(slider), 'show_legend': int(show_legend)}
# Process data and execute
div_number = str(time.time())
div_number = re.sub('[.]', '', div_number)
data_to_plot = []
rho_data = process_data(rho)
data_to_plot.append(dict(
data=rho_data
))
html = html_template.substitute({
'divNumber': div_number
})
javascript = javascript_template.substitute({
'divNumber': div_number,
'executions': data_to_plot,
'options': options
})
display(HTML(html + javascript))