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merge_k_qubit_gates_test.py
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merge_k_qubit_gates_test.py
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# Copyright 2022 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.
# pylint: skip-file
from typing import List
import numpy as np
import pytest
import cirq
def assert_optimizes(optimized: cirq.AbstractCircuit, expected: cirq.AbstractCircuit):
# Ignore differences that would be caught by follow-up optimizations.
followup_transformers: List[cirq.TRANSFORMER] = [
cirq.drop_negligible_operations,
cirq.drop_empty_moments,
]
for transform in followup_transformers:
optimized = transform(optimized)
expected = transform(expected)
cirq.testing.assert_same_circuits(optimized, expected)
def test_merge_1q_unitaries():
q, q2 = cirq.LineQubit.range(2)
# 1. Combines trivial 1q sequence.
c = cirq.Circuit(cirq.X(q) ** 0.5, cirq.Z(q) ** 0.5, cirq.X(q) ** -0.5)
c = cirq.merge_k_qubit_unitaries(c, k=1)
op_list = [*c.all_operations()]
assert len(op_list) == 1
assert isinstance(op_list[0].gate, cirq.MatrixGate)
cirq.testing.assert_allclose_up_to_global_phase(
cirq.unitary(c), cirq.unitary(cirq.Y ** 0.5), atol=1e-7
)
# 2. Gets blocked at a 2q operation.
c = cirq.Circuit([cirq.Z(q), cirq.H(q), cirq.X(q), cirq.H(q), cirq.CZ(q, q2), cirq.H(q)])
c = cirq.drop_empty_moments(cirq.merge_k_qubit_unitaries(c, k=1))
assert len(c) == 3
cirq.testing.assert_allclose_up_to_global_phase(cirq.unitary(c[0]), np.eye(2), atol=1e-7)
assert isinstance(c[-1][q].gate, cirq.MatrixGate)
def test_respects_nocompile_tags():
q = cirq.NamedQubit("q")
c = cirq.Circuit(
[cirq.Z(q), cirq.H(q), cirq.X(q), cirq.H(q), cirq.X(q).with_tags("nocompile"), cirq.H(q)]
)
context = cirq.TransformerContext(tags_to_ignore=("nocompile",))
c = cirq.drop_empty_moments(cirq.merge_k_qubit_unitaries(c, k=1, context=context))
assert len(c) == 3
cirq.testing.assert_allclose_up_to_global_phase(cirq.unitary(c[0]), np.eye(2), atol=1e-7)
assert c[1][q] == cirq.X(q).with_tags("nocompile")
assert isinstance(c[-1][q].gate, cirq.MatrixGate)
def test_ignores_2qubit_target():
c = cirq.Circuit(cirq.CZ(*cirq.LineQubit.range(2)))
assert_optimizes(optimized=cirq.merge_k_qubit_unitaries(c, k=1), expected=c)
def test_ignore_unsupported_gate():
class UnsupportedDummy(cirq.Gate):
def _num_qubits_(self) -> int:
return 1
c = cirq.Circuit(UnsupportedDummy()(cirq.LineQubit(0)))
assert_optimizes(optimized=cirq.merge_k_qubit_unitaries(c, k=1), expected=c)
def test_1q_rewrite():
q0, q1 = cirq.LineQubit.range(2)
circuit = cirq.Circuit(
cirq.X(q0), cirq.Y(q0), cirq.X(q1), cirq.CZ(q0, q1), cirq.Y(q1), cirq.measure(q0, q1)
)
assert_optimizes(
optimized=cirq.merge_k_qubit_unitaries(
circuit, k=1, rewriter=lambda ops: cirq.H(ops.qubits[0])
),
expected=cirq.Circuit(
cirq.H(q0), cirq.H(q1), cirq.CZ(q0, q1), cirq.H(q1), cirq.measure(q0, q1)
),
)
def test_merge_k_qubit_unitaries_raises():
with pytest.raises(ValueError, match="k should be greater than or equal to 1"):
_ = cirq.merge_k_qubit_unitaries(cirq.Circuit())
def test_merge_complex_circuit_preserving_moment_structure():
q = cirq.LineQubit.range(3)
c_orig = cirq.Circuit(
cirq.Moment(cirq.H.on_each(*q)),
cirq.CNOT(q[0], q[2]),
cirq.CNOT(*q[0:2]),
cirq.H(q[0]),
cirq.CZ(*q[:2]),
cirq.X(q[0]),
cirq.Y(q[1]),
cirq.CNOT(*q[0:2]),
cirq.CNOT(*q[1:3]).with_tags("ignore"),
cirq.X(q[0]),
cirq.Moment(cirq.X(q[0]).with_tags("ignore"), cirq.Y(q[1]), cirq.Z(q[2])),
cirq.Moment(cirq.CNOT(*q[:2]), cirq.measure(q[2], key="a")),
cirq.X(q[0]).with_classical_controls("a"),
strategy=cirq.InsertStrategy.NEW,
)
cirq.testing.assert_has_diagram(
c_orig,
'''
0: ───H───@───@───H───@───X───────@─────────────────X───X['ignore']───@───X───
│ │ │ │ │ ║
1: ───H───┼───X───────@───────Y───X───@['ignore']───────Y─────────────X───╫───
│ │ ║
2: ───H───X───────────────────────────X─────────────────Z─────────────M───╫───
║ ║
a: ═══════════════════════════════════════════════════════════════════@═══^═══
''',
)
component_id = 0
def rewriter_merge_to_circuit_op(op: 'cirq.CircuitOperation') -> 'cirq.OP_TREE':
nonlocal component_id
component_id = component_id + 1
return op.with_tags(f'{component_id}')
c_new = cirq.merge_k_qubit_unitaries(
c_orig,
k=2,
context=cirq.TransformerContext(tags_to_ignore=("ignore",)),
rewriter=rewriter_merge_to_circuit_op,
)
cirq.testing.assert_has_diagram(
cirq.drop_empty_moments(c_new),
'''
[ 0: ───H───@─── ] [ 0: ───────@───H───@───X───@───X─── ] [ 0: ───────@─── ]
0: ───[ │ ]────────[ │ │ │ ]──────────────────────X['ignore']───────────[ │ ]────────X───
[ 2: ───H───X─── ]['1'] [ 1: ───H───X───────@───Y───X─────── ]['2'] [ 1: ───Y───X─── ]['4'] ║
│ │ │ ║
1: ───┼─────────────────────────#2────────────────────────────────────────────@['ignore']─────────────────────────#2────────────────────────╫───
│ │ ║
2: ───#2──────────────────────────────────────────────────────────────────────X─────────────[ 2: ───Z─── ]['3']───M─────────────────────────╫───
║ ║
a: ═══════════════════════════════════════════════════════════════════════════════════════════════════════════════@═════════════════════════^═══''',
)
component_id = 0
def rewriter_replace_with_decomp(op: 'cirq.CircuitOperation') -> 'cirq.OP_TREE':
nonlocal component_id
component_id = component_id + 1
tag = f'{component_id}'
if len(op.qubits) == 1:
return [cirq.T(op.qubits[0]).with_tags(tag)]
one_layer = [op.with_tags(tag) for op in cirq.T.on_each(*op.qubits)]
two_layer = [cirq.SQRT_ISWAP(*op.qubits).with_tags(tag)]
return [one_layer, two_layer, one_layer]
c_new = cirq.merge_k_qubit_unitaries(
c_orig,
k=2,
context=cirq.TransformerContext(tags_to_ignore=("ignore",)),
rewriter=rewriter_replace_with_decomp,
)
cirq.testing.assert_has_diagram(
cirq.drop_empty_moments(c_new),
'''
0: ───T['1']───iSwap['1']───T['1']───T['2']───iSwap['2']───T['2']─────────────────X['ignore']───T['4']───iSwap['4']───T['4']───X───
│ │ │ ║
1: ────────────┼─────────────────────T['2']───iSwap^0.5────T['2']───@['ignore']─────────────────T['4']───iSwap^0.5────T['4']───╫───
│ │ ║
2: ───T['1']───iSwap^0.5────T['1']──────────────────────────────────X─────────────T['3']────────M──────────────────────────────╫───
║ ║
a: ═════════════════════════════════════════════════════════════════════════════════════════════@══════════════════════════════^═══''',
)
def test_merge_k_qubit_unitaries_deep():
q = cirq.LineQubit.range(2)
h_cz_y = [cirq.H(q[0]), cirq.CZ(*q), cirq.Y(q[1])]
c_orig = cirq.Circuit(
h_cz_y,
cirq.Moment(cirq.X(q[0]).with_tags("ignore"), cirq.Y(q[1])),
cirq.CircuitOperation(cirq.FrozenCircuit(h_cz_y)).repeat(6).with_tags("ignore"),
[cirq.CNOT(*q), cirq.CNOT(*q)],
cirq.CircuitOperation(cirq.FrozenCircuit(h_cz_y)).repeat(4),
[cirq.CNOT(*q), cirq.CZ(*q), cirq.CNOT(*q)],
cirq.CircuitOperation(cirq.FrozenCircuit(h_cz_y)).repeat(5).with_tags("preserve_tag"),
)
def _wrap_in_cop(ops: cirq.OP_TREE, tag: str):
return cirq.CircuitOperation(cirq.FrozenCircuit(ops)).with_tags(tag)
c_expected = cirq.Circuit(
_wrap_in_cop([h_cz_y, cirq.Y(q[1])], '1'),
cirq.Moment(cirq.X(q[0]).with_tags("ignore")),
cirq.CircuitOperation(cirq.FrozenCircuit(h_cz_y)).repeat(6).with_tags("ignore"),
_wrap_in_cop([cirq.CNOT(*q), cirq.CNOT(*q)], '2'),
cirq.CircuitOperation(cirq.FrozenCircuit(_wrap_in_cop(h_cz_y, '3'))).repeat(4),
_wrap_in_cop([cirq.CNOT(*q), cirq.CZ(*q), cirq.CNOT(*q)], '4'),
cirq.CircuitOperation(cirq.FrozenCircuit(_wrap_in_cop(h_cz_y, '5')))
.repeat(5)
.with_tags("preserve_tag"),
strategy=cirq.InsertStrategy.NEW,
)
component_id = 0
def rewriter_merge_to_circuit_op(op: 'cirq.CircuitOperation') -> 'cirq.OP_TREE':
nonlocal component_id
component_id = component_id + 1
return op.with_tags(f'{component_id}')
context = cirq.TransformerContext(tags_to_ignore=("ignore",), deep=True)
c_new = cirq.merge_k_qubit_unitaries(
c_orig,
k=2,
context=context,
rewriter=rewriter_merge_to_circuit_op,
)
cirq.testing.assert_same_circuits(c_new, c_expected)
def _wrap_in_matrix_gate(ops: cirq.OP_TREE):
op = _wrap_in_cop(ops, 'temp')
return cirq.MatrixGate(cirq.unitary(op)).on(*op.qubits)
c_expected_matrix = cirq.Circuit(
_wrap_in_matrix_gate([h_cz_y, cirq.Y(q[1])]),
cirq.Moment(cirq.X(q[0]).with_tags("ignore")),
cirq.CircuitOperation(cirq.FrozenCircuit(h_cz_y)).repeat(6).with_tags("ignore"),
_wrap_in_matrix_gate([cirq.CNOT(*q), cirq.CNOT(*q)]),
cirq.CircuitOperation(cirq.FrozenCircuit(_wrap_in_matrix_gate(h_cz_y))).repeat(4),
_wrap_in_matrix_gate([cirq.CNOT(*q), cirq.CZ(*q), cirq.CNOT(*q)]),
cirq.CircuitOperation(cirq.FrozenCircuit(_wrap_in_matrix_gate(h_cz_y)))
.repeat(5)
.with_tags("preserve_tag"),
strategy=cirq.InsertStrategy.NEW,
)
c_new_matrix = cirq.merge_k_qubit_unitaries(c_orig, k=2, context=context)
cirq.testing.assert_same_circuits(c_new_matrix, c_expected_matrix)
def test_merge_k_qubit_unitaries_deep_recurses_on_large_circuit_op():
q = cirq.LineQubit.range(2)
c_orig = cirq.Circuit(
cirq.CircuitOperation(cirq.FrozenCircuit(cirq.X(q[0]), cirq.H(q[0]), cirq.CNOT(*q)))
)
c_expected = cirq.Circuit(
cirq.CircuitOperation(
cirq.FrozenCircuit(
cirq.CircuitOperation(cirq.FrozenCircuit(cirq.X(q[0]), cirq.H(q[0]))).with_tags(
"merged"
),
cirq.CNOT(*q),
)
)
)
c_new = cirq.merge_k_qubit_unitaries(
c_orig,
context=cirq.TransformerContext(deep=True),
k=1,
rewriter=lambda op: op.with_tags("merged"),
)
cirq.testing.assert_same_circuits(c_new, c_expected)