# Copyright 2018 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.
from typing import Dict, List, Set, Tuple
from cirq.devices import GridQubit
from cirq.google.xmon_device import XmonDevice
from cirq.value import Duration
def _parse_device(s: str) -> Tuple[List[GridQubit], Dict[str, Set[GridQubit]]]:
"""Parse ASCIIart device layout into info about qubits and connectivity.
Args:
s: String representing the qubit layout. Each line represents a row,
and each character in the row is a qubit, or a blank site if the
character is a hyphen '-'. Different letters for the qubit specify
which measurement line that qubit is connected to, e.g. all 'A'
qubits share a measurement line. Leading and trailing spaces on
each line are ignored.
Returns:
A list of qubits and a dict mapping measurement line name to the qubits
on that measurement line.
"""
lines = s.strip().split('\n')
qubits = [] # type: List[GridQubit]
measurement_lines = {} # type: Dict[str, Set[GridQubit]]
for row, line in enumerate(lines):
for col, c in enumerate(line.strip()):
if c != '-':
qubit = GridQubit(row, col)
qubits.append(qubit)
measurement_line = measurement_lines.setdefault(c, set())
measurement_line.add(qubit)
return qubits, measurement_lines
_FOXTAIL_GRID = """
AAAAABBBBBB
CCCCCCDDDDD
"""
class _NamedConstantXmonDevice(XmonDevice):
def __init__(self, constant: str, **kwargs) -> None:
super().__init__(**kwargs)
self._repr = constant
def __repr__(self):
return self._repr
Foxtail = _NamedConstantXmonDevice(
'cirq.google.Foxtail',
measurement_duration=Duration(nanos=1000),
exp_w_duration=Duration(nanos=20),
exp_11_duration=Duration(nanos=50),
qubits=_parse_device(_FOXTAIL_GRID)[0])
_BRISTLECONE_GRID = """
-----AB-----
----ABCD----
---ABCDEF---
--ABCDEFGH--
-ABCDEFGHIJ-
ABCDEFGHIJKL
-CDEFGHIJKL-
--EFGHIJKL--
---GHIJKL---
----IJKL----
-----KL-----
"""
Bristlecone = _NamedConstantXmonDevice(
'cirq.google.Bristlecone',
measurement_duration=Duration(nanos=1000),
exp_w_duration=Duration(nanos=20),
exp_11_duration=Duration(nanos=50),
qubits=_parse_device(_BRISTLECONE_GRID)[0])