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bloch_sphere.py
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bloch_sphere.py
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# Copyright 2021 The Cirq Developers
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import cirq
from cirq_web import widget
class BlochSphere(widget.Widget):
def __init__(self, sphere_radius: int = 5, state_vector: cirq.STATE_VECTOR_LIKE = None):
"""Initializes a BlochSphere.
Also initializes it's parent class Widget with the bundle file provided.
Args:
sphere_radius: the radius of the bloch sphere in the three.js diagram.
The default value is 5.
state_vector: a state vector to pass in to be represented.
Raises:
ValueError: If the `sphere_radius` is not positive or the `state_vector` is not
supplied.
"""
super().__init__()
if sphere_radius <= 0:
raise ValueError('You must input a positive radius for the sphere')
self.sphere_radius = sphere_radius
if state_vector is None:
raise ValueError('No state vector given in BlochSphere initialization')
self.bloch_vector = cirq.bloch_vector_from_state_vector(
cirq.to_valid_state_vector(state_vector, num_qubits=1), 0
)
def get_client_code(self) -> str:
return f"""
<script>
renderBlochSphere('{self.id}', {self.sphere_radius})
.addVector({self.bloch_vector[0]}, {self.bloch_vector[1]}, {self.bloch_vector[2]});
</script>
"""
def get_widget_bundle_name(self) -> str:
return 'bloch_sphere.bundle.js'