[Python] Add native OpenQASM 2.0/3.0 parser and expand Qiskit interoperability#4357
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QuantumRaul wants to merge 6 commits intoNVIDIA:mainfrom
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[Python] Add native OpenQASM 2.0/3.0 parser and expand Qiskit interoperability#4357QuantumRaul wants to merge 6 commits intoNVIDIA:mainfrom
QuantumRaul wants to merge 6 commits intoNVIDIA:mainfrom
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Signed-off-by: Raul Martinez <raul.marpa01@gmail.com>
…perability in cudaq.contrib Signed-off-by: Raul Martinez <raul.marpa01@gmail.com>
1 task
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⚠️ Required checks (28/39) — 11 missing — declared in .github/required-checks.yml for workflow_dispatch
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|---|---|---|
| Build and test (amd64, llvm, openmpi) / Dev environment (Debug) | ✅ success | view |
| Build and test (amd64, llvm, openmpi) / Dev environment (Python) | ✅ success | view |
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| Build and test (arm64, gcc12, openmpi) / Dev environment (Python) | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Build CUDA Quantum assets | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Minimal OpenMPI installation | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Validate installer (debian:12) | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Validate installer (fedora:42) | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Validate installer (opensuse/leap:15.5) | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Validate installer (redhat/ubi9:9.6) | ✅ success | view |
| Create CUDA Quantum installer (amd64, 12.6) / Validate installer (ubuntu:22.04) | ✅ success | view |
| Create CUDA Quantum installer (arm64, 12.6) / Build CUDA Quantum assets | ✅ success | view |
| Create CUDA Quantum installer (arm64, 12.6) / Minimal OpenMPI installation | ✅ success | view |
| Create CUDA Quantum installer (arm64, 12.6) / Validate installer (redhat/ubi9:9.6) | ✅ success | view |
| Create CUDA Quantum installer (arm64, 12.6) / Validate installer (ubuntu:22.04) | ✅ success | view |
| Create Docker images (amd64) / Documentation | ✅ success | view |
| Create Docker images (amd64) / Validation | ✅ success | view |
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|
CUDA Quantum Docs Bot: A preview of the documentation can be found here. |
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Summary
Expands
cudaq.contribinteroperability with two related improvements:from_qasm_str,from_qasm) — pure-Python parser that converts OpenQASM source directly into a CUDA-Q kernel, no Qiskit dependency. Dispatches on theOPENQASM <version>;header; 2.x is handled by_QASM2Translator, 3.x by the_QASM3Translatorsubclass.from_qiskit— a complete dispatch table for theqelib1.inc/stdgates.incgate sets, with a recursive fallback throughInstruction.definitionfor custom and composite gates.Both helpers share a common gate handler table (
_GATE_HANDLERSinqiskit_convert.py) so the two translators stay in lockstep on gate semantics.Motivation
The new native translator removes the dependency for qiskit over OpenQASM translation needs, adds first-class 3.0 support, and keeps
from_qiskitrobust enough to round-trip circuits built with the full Qiskit standard library.Changes
python/cudaq/contrib/qasm_convert.py_QASM2Translatorcovering the fullqelib1.incgate set (Paulis, 1-qubit Clifford, universalu1/u2/u3/u/p/u0, rotations, extended single-qubitsx/sxdg/r, controlled one- and two-qubit gates, swap family, two-qubit parametricsrxx/ryy/rzz/rzx, and multi-qubitccx/ccz/rccx/c3x/c4x/mcx/mcp), plusmeasure,reset,barrier,opaque, and user-definedgateblocks with recursive expansion._QASM3Translator(subclass) adds the 3.0 surface:qubit[N]/bit[N]declarations,c = measure q;assignment, built-inU(θ,φ,λ)and 4-parameterU(θ,φ,λ,γ),gphase(γ), legacy uppercaseCXandI, andinclude "stdgates.inc";. Gate modifiers (ctrl @,negctrl @,inv @,pow(n) @) and classical control / typed-variable declarations will be lately implemented, at the moment raiseNotImplementedErrorwith a clear message_eval_exprbuilt onast.parsewith an allowlist (constantspi/e/tau; standard math functions;+ - * / ** ^and unary+ -), used for gate-parameter expressions and nested custom-gate environments.h q;applies element-wise, mismatched sizes rejected).python/cudaq/contrib/qiskit_convert.pyif/elifdispatch with a single_GATE_HANDLERSdict keyed byoperation.name, covering the full Qiskit standard library.RXX,RYY,RZZ,RZX,ECR,iSWAP,XXPlusYY,XXMinusYY) and multi-qubit gates (CCZ,RCCX/Margolus,MCXvariants,MCP/MCPhase,CSX,CU)._apply_instructiongracefully handles unboundParameterExpressions (returns False so the caller raises a clearValueError) and recursively expands any gate not in the dispatch table throughInstruction.definition.python/cudaq/contrib/__init__.pyfrom_qasm/from_qasm_strentry points alongsidefrom_qiskit.Tests
python/tests/contrib/test_from_qasm.py— unit coverage for the expression evaluator, both QASM 2.0 and 3.0 gate surfaces, register broadcasting, and user-defined gates.python/tests/contrib/test_from_qiskit.py— per-gate tests for the expanded dispatch table.python/tests/contrib/test_roundtrip.py(new) — end-to-end round-trip tests across the three conversion paths (direct QASM, QASM→Qiskit→CUDA-Q, Qiskit→QASM→CUDA-Q), including a consistency cross-check that direct and indirect paths produce the same measurement distributions.