# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2022
#
# 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.
"""DiagonalBarTile class."""
import numpy as np
from qiskit.exceptions import QiskitError
from qiskit_qec.geometry.model.shell import Shell
from qiskit_qec.geometry.tiles.tile import Tile
from qiskit_qec.geometry.tiles.tilefactory import TileFactory
from qiskit_qec.operators.pauli_list import PauliList
# pylint: disable=anomalous-backslash-in-string)
[docs]
class DiagonalBarTile(Tile):
r"""Diagonal Bar Tile
The diagram is as follows::
q0 q1 q1 q2
v0 v0 v0 v1
o- - - - - -o o- - - - - -o
|\ /| | |
| \ / | | |
| 0 > < 1 | | 2 |
| / \ | | |
|/ \| | |
o- - - - - -o o- - - - - -o
v1 v1 v3 v2
q3 q4 q4 q5
q3 q4 q4 q5
v0 v1 v0 v0
o- - - - - -o o- - - - - -o
| | |\ /|
| | | \ / |
| 3 | | 4 > < 5 |
| | | / \ |
| | |/ \|
o- - - - - -o o- - - - - -o
v3 v2 v1 v1
q6 q7 q7 q8
"""
wf_operator_dict = {
"pXXZZXX": [
PauliList(["XX"]),
PauliList(["XX"]),
PauliList(["ZZZZ"]),
PauliList(["ZZZZ"]),
PauliList(["XX"]),
PauliList(["XX"]),
],
"pZZXXZZ": [
PauliList(["ZZ"]),
PauliList(["ZZ"]),
PauliList(["XXXX"]),
PauliList(["XXXX"]),
PauliList(["ZZ"]),
PauliList(["ZZ"]),
],
}
# Descriptions of wireframes
# qubit indices for each wireframe
wf_q_indices = [[0, 3], [1, 4], [1, 2, 5, 4], [3, 4, 7, 6], [4, 7], [5, 8]]
# coordinates for each wireframe vertex in path list form to enable the
# creation of the associate edges
wf_coordinates = [
[[-1, 1], [-1, 0]],
[[0, 1], [0, 0]],
[[0, 1], [1, 1], [1, 0], [0, 0]],
[[-1, 0], [0, 0], [0, -1], [-1, -1]],
[[0, 0], [0, -1]],
[[1, 0], [1, -1]],
]
# If the wf's are closed loops or not
wf_loop_indicator = [False, False, True, True, False, False]
# How wireframes components combine into faces/operators
faces_wf_components = [[0], [1], [2], [3], [4], [5]]
# Face colors (wf's inherit colors from faces)
face_colors = ["yellowgreen", "yellowgreen", "tomato", "tomato", "yellowgreen", "yellowgreen"]
num_faces = 6
size = np.array([2, 2])
num_qubits = 9
u_vec = np.array([2, 0])
v_vec = np.array([0, 2])
def __new__(
cls,
origin: np.array,
qubit_count=None,
qubit_data=None,
operators=None,
optype="pXXZZXX",
) -> Shell:
r"""Diagonal Hour Glass Tile
The diagram is as follows::
q0 q1 q1 q2
v0 v0 v0 v1
o- - - - - -o o- - - - - -o
|\ /| | |
| \ / | | |
| 0 > < 1 | | 2 |
| / \ | | |
|/ \| | |
o- - - - - -o o- - - - - -o
v1 v1 v3 v2
q3 q4 q4 q5
q3 q4 q4 q5
v0 v1 v0 v0
o- - - - - -o o- - - - - -o
| | |\ /|
| | | \ / |
| 3 | | 4 > < 5 |
| | | / \ |
| | |/ \|
o- - - - - -o o- - - - - -o
v3 v2 v1 v1
q6 q7 q7 q8
Face colors for faces [0,1,2,3,4,5] are ["yellowgreen", "yellowgreen",
"tomato", "tomato", "yellowgreen","yellowgreen"]
Preformatted operators are stored in DiagonalHourGlassTile.op_dict. Keys for op_dict are of the
form [p|c]PPPP... where p = pattern and c = copy and P is a Pauli opertor X, Z, Y.::
"pXXZZXX" -> #0 face is Pauli('XX') operator,
#1 face is Pauli('XX') operator,
#3 face is Pauli('ZZZZ') operator etc.
Available precomputed operator layouts are::
"pXXZZXX", "pZZXXZZ"
The operator variable may be used to define the operators specifically. The operator must be
a list of PauliList objects where each PauliList describes the opertors to be built for the
faces as indexed above 0,1,2,3, ... If the PauliList contains k Paulis then k operators will
be created for the given face.
Args:
origin (np.array): Coordinates of origin of tile (shell)
qubit_count: Qubit counter. Defaults to None.
qubit_data: Qubit data. Defaults to None.
operators: Operators for tile faces. Defaults to None.
optype (optional): Which of the listed opertor mapppings to used. Defaults to "pXXZZXX".
Raises:
QiskitError: Unsupported operator type
Returns:
Shell: Returns a Diagonal Hour Glass tile (shell) with provided origin
"""
if operators is None:
try:
operators = DiagonalBarTile.wf_operator_dict[optype]
except KeyError as key_error:
raise QiskitError(f"Unsupported operator type: {optype}") from key_error
return TileFactory(
origin=origin,
wf_coordinates=DiagonalBarTile.wf_coordinates,
wf_q_indices=DiagonalBarTile.wf_q_indices,
wf_loop_indicator=DiagonalBarTile.wf_loop_indicator,
faces_wf_components=DiagonalBarTile.faces_wf_components,
num_qubits=DiagonalBarTile.num_qubits,
face_colors=DiagonalBarTile.face_colors,
qubit_count=qubit_count,
qubit_data=qubit_data,
operators=operators,
)