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Port RemoveDiagonalGatesBeforeMeasure to rust (Qiskit#13065)
* add rust code for remove_diagonal_gates_before_measure * replace python code by rust code for remove_diagonal_gates_brefore_measure * make some dag_circuit functions public * fix some of the tests failures * fix another failing test, add more diagonal gates * add tests for added diagonal gates: p, cp, cs, csdg * make the lists of diagonal gates into static arrays * formatting * change nodes_to_remove type to Vec * remove the HashSet following review * add CCZ diagonal gate * add tests for CCZ diagonal gate * add release notes * fix lint
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crates/accelerate/src/remove_diagonal_gates_before_measure.rs
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| // This code is part of Qiskit. | ||
| // | ||
| // (C) Copyright IBM 2024 | ||
| // | ||
| // 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. | ||
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| /// Remove diagonal gates (including diagonal 2Q gates) before a measurement. | ||
| use pyo3::prelude::*; | ||
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| use qiskit_circuit::dag_circuit::{DAGCircuit, NodeType}; | ||
| use qiskit_circuit::operations::Operation; | ||
| use qiskit_circuit::operations::StandardGate; | ||
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| /// Run the RemoveDiagonalGatesBeforeMeasure pass on `dag`. | ||
| /// Args: | ||
| /// dag (DAGCircuit): the DAG to be optimized. | ||
| /// Returns: | ||
| /// DAGCircuit: the optimized DAG. | ||
| #[pyfunction] | ||
| #[pyo3(name = "remove_diagonal_gates_before_measure")] | ||
| fn run_remove_diagonal_before_measure(dag: &mut DAGCircuit) -> PyResult<()> { | ||
| static DIAGONAL_1Q_GATES: [StandardGate; 8] = [ | ||
| StandardGate::RZGate, | ||
| StandardGate::ZGate, | ||
| StandardGate::TGate, | ||
| StandardGate::SGate, | ||
| StandardGate::TdgGate, | ||
| StandardGate::SdgGate, | ||
| StandardGate::U1Gate, | ||
| StandardGate::PhaseGate, | ||
| ]; | ||
| static DIAGONAL_2Q_GATES: [StandardGate; 7] = [ | ||
| StandardGate::CZGate, | ||
| StandardGate::CRZGate, | ||
| StandardGate::CU1Gate, | ||
| StandardGate::RZZGate, | ||
| StandardGate::CPhaseGate, | ||
| StandardGate::CSGate, | ||
| StandardGate::CSdgGate, | ||
| ]; | ||
| static DIAGONAL_3Q_GATES: [StandardGate; 1] = [StandardGate::CCZGate]; | ||
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| let mut nodes_to_remove = Vec::new(); | ||
| for index in dag.op_nodes(true) { | ||
| let node = &dag.dag[index]; | ||
| let NodeType::Operation(inst) = node else {panic!()}; | ||
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| if inst.op.name() == "measure" { | ||
| let predecessor = (dag.quantum_predecessors(index)) | ||
| .next() | ||
| .expect("index is an operation node, so it must have a predecessor."); | ||
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| match &dag.dag[predecessor] { | ||
| NodeType::Operation(pred_inst) => match pred_inst.standard_gate() { | ||
| Some(gate) => { | ||
| if DIAGONAL_1Q_GATES.contains(&gate) { | ||
| nodes_to_remove.push(predecessor); | ||
| } else if DIAGONAL_2Q_GATES.contains(&gate) | ||
| || DIAGONAL_3Q_GATES.contains(&gate) | ||
| { | ||
| let successors = dag.quantum_successors(predecessor); | ||
| let remove_s = successors | ||
| .map(|s| { | ||
| let node_s = &dag.dag[s]; | ||
| if let NodeType::Operation(inst_s) = node_s { | ||
| inst_s.op.name() == "measure" | ||
| } else { | ||
| false | ||
| } | ||
| }) | ||
| .all(|ok_to_remove| ok_to_remove); | ||
| if remove_s { | ||
| nodes_to_remove.push(predecessor); | ||
| } | ||
| } | ||
| } | ||
| None => { | ||
| continue; | ||
| } | ||
| }, | ||
| _ => { | ||
| continue; | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| for node_to_remove in nodes_to_remove { | ||
| if dag.dag.node_weight(node_to_remove).is_some() { | ||
| dag.remove_op_node(node_to_remove); | ||
| } | ||
| } | ||
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| Ok(()) | ||
| } | ||
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| #[pymodule] | ||
| pub fn remove_diagonal_gates_before_measure(m: &Bound<PyModule>) -> PyResult<()> { | ||
| m.add_wrapped(wrap_pyfunction!(run_remove_diagonal_before_measure))?; | ||
| Ok(()) | ||
| } |
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releasenotes/notes/update-remove-diagonal-gates-before-measure-86abe39e46d5dad5.yaml
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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| features_transpiler: | ||
| - | | ||
| The :class:`.RemoveDiagonalGatesBeforeMeasure` transpiler pass has been upgraded to | ||
| include more diagonal gates: :class:`.PhaseGate`, :class:`.CPhaseGate`, | ||
| :class:`.CSGate`, :class:`.CSdgGate` and :class:`.CCZGate`. | ||
| In addition, the code of the :class:`.RemoveDiagonalGatesBeforeMeasure` was ported to Rust, | ||
| and is now x20 faster for a 20 qubit circuit. |
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