# Copyright 2021 SpinQ Technology Co., Ltd.
#
# 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
#
# http://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 List
from .basic_gate import Gate
from .matrix_gate import MatrixGate
from .controlled_gate import ControlledGate
from .gates import I, H, X, Y, Z, Rx, Ry, Rz, P, T, Td, S, Sd, CX, CY, CZ, SWAP, MEASURE, BARRIER
from .instruction import Instruction
from copy import deepcopy
class InverseGate(Gate):
def __init__(self, gate: Gate) -> None:
super().__init__(gate.label+'_inv', gate.qubit_num)
if isinstance(gate, ControlledGate) or isinstance(gate, InverseGate):
self.sub_gate = gate
self.base_gate = gate.base_gate
else:
self.sub_gate = gate
self.base_gate = gate
class InverseBuilder(object):
def __init__(self, gate: Gate) -> None:
self.__gate = gate
def to_gate(self) -> Gate:
return self._inverse(self.__gate)
def _inverse(self, g: Gate) -> Gate:
if g in (I, H, X, Y, Z, CX, CY, CZ, SWAP, MEASURE, BARRIER):
return g
elif g in (Rx, Ry, Rz, P):
rot_gate = InverseGate(g)
param_lambda = lambda params: -1 * params[0]
rot_gate.factors.append((g, list(range(g.qubit_num)), param_lambda))
return rot_gate
elif g == T:
return Td
elif g == Td:
return T
elif g == S:
return Sd
elif g == Sd:
return S
elif len(g.factors) > 0:
inv_gate = InverseGate(g)
for f in g.factors:
if len(f) == 2:
inv_gate.factors.append((self._inverse(f[0]), f[1]))
else:
inv_gate.factors.append((self._inverse(f[0]), f[1], f[2]))
inv_gate.factors.reverse()
return inv_gate
def invert_instruction(instruction: Instruction) -> Instruction:
inst_inv = deepcopy(instruction)
builder = InverseBuilder(instruction.gate)
inst_inv.gate = builder.to_gate()
return inst_inv
