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Fix incorrect gates implementation, and mappings. - #949
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The PR adds PRXGate and QuantumCircuit.prx, deprecates RGate and QuantumCircuit.r, updates SX-family gate phases and controlled U3 phase synthesis, and revises Qiskit and PennyLane mappings. Tests and documentation cover these changes.
Changes: Standard-Gate Convention Corrections
Layer / File(s)
Summary
Gate definitions and circuit API src/qrisp/circuit/standard_operations.py, src/qrisp/circuit/pass_management/passes/convert_to_prx.py, src/qrisp/circuit/quantum_circuit.py, src/qrisp/core/gate_application_functions.py, src/qrisp/operators/qubit/qubit_operator.py, src/qrisp/jasp/interpreter_tools/interpreters/catalyst_interpreter.py, tests/circuit_tests/operation_tests/test_standard_operations.py, tests/circuit_tests/passes/test_PRXGate.py, tests/circuit_tests/test_quantum_circuit.py, tests/core_tests/test_gate_application_functions.py, tests/operators_tests/test_qubit_operator.py, tests/jax_tests/test_catalyst_interface.py, documentation/source/reference/Circuit Manipulation/QuantumCircuit.rst, documentation/source/general/changelog/changelog-dev.rst
PRXGate is added as a U3Gate subclass with inverse and parameter-binding behavior. RGate and QuantumCircuit.r now warn and use PRX operations; QuantumCircuit.prx is added. SXGate and SXDGGate set global phases of π/4 and −π/4. SX-dagger application and the Y-factor basis change use the updated gate definitions. Tests and documentation cover these changes.
Controlled U3 synthesis includes the gate global phase in diagonal, RX, RY, and general phase synthesis. Tests compare controlled-gate unitaries with their synthesized definitions.
Qiskit and PennyLane mappings src/qrisp/interface/converter/*, tests/interface_tests/test_converter_qrisp_to_qml.py, tests/interface_tests/test_qiskit_converter.py, documentation/source/general/changelog/changelog-dev.rst
Qiskit maps u1 to RZGate and maps Qiskit’s u1 operation name to Qrisp p. PennyLane maps sx to qml.SX and prx to qml.Rot with revised parameters. Converter tests cover gate unitaries, controls, inverse gates, and symbolic parameters.
sequenceDiagram
participant QuantumCircuit
participant PRXGate
participant PennyLaneConverter
participant PennyLane
QuantumCircuit->>PRXGate: create prx operation with alpha and beta
PRXGate->>PennyLaneConverter: provide prx parameters
PennyLaneConverter->>PennyLane: emit qml.Rot
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Possibly related issues
eclipse-qrisp/Qrisp#996 reports controlled U1 and SX behavior tied to global-phase differences. This PR updates controlled phase synthesis and the U1 and SX gate conventions.
Possibly related PRs
eclipse-qrisp/Qrisp#932: The PR tests controlled powers of a unitary for phase estimation. This change updates global-phase handling in controlled U3 synthesis.
Merge Risk: Moderate · previous review 2b72c
Converting a controlled PRX gate (including the deprecated R gate) to PennyLane would fail. The documentation build also appears broken by a changelog formatting issue. Fix both before merging.
Security Architecture Review
Security architecture risk:🔵 Low · up to b424e
The changes correct gate behavior within existing construction and conversion paths. No introduced security vulnerability or increased authority was identified. Risk is low because downstream users can observe different circuit results, and compatibility coverage is not exhaustive.
Retained concerns
No architecture-level concerns identified.
Security review details
Security Blast Radius
inferred — The demonstrated propagation is across circuits and framework conversions using the corrected gates. The inspected paths operate on caller-supplied circuit objects; they do not demonstrate new tenant, credential, service, or persistent-store authority. Deployment-wide exposure cannot be quantified without external caller topology.
Trust Boundaries and Controls
inferred — The base-to-head mapping edits change circuit semantics within existing conversion paths, not the identity or authority of their callers. Inspection found no new attacker-controlled route or bypass of an existing security control in those edits; this conclusion is limited to the inspected repository paths.
Pre-merge checks: 5
Check name
Status
Explanation
Title check
The title identifies the gate implementation and mapping fixes, which are the main changes, though it does not name the affected gates.
Description check
The description covers the purpose, related issues, change type, key fixes, and test status. It marks the change as breaking but does not describe the migration path, and it omits the move from RGate …
Linked Issues check
Issue #673 requires Qrisp SXGate and SXDGGate to match Qiskit’s global-phase convention, including in controlled use. The PR sets their global phases to π/4 and −π/4, accounts for global phase…
Out of Scope Changes check
The RGate/PRXGate and U1/RZ changes match the current PR description. The controlled-gate, PennyLane, Catalyst, basis-change, converter, and test changes support the stated gate-matrix and con…
Docstring Coverage
Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking.
Full details: Description check
Explanation
The description covers the purpose, related issues, change type, key fixes, and test status. It marks the change as breaking but does not describe the migration path, and it omits the move from RGate and QuantumCircuit.r to PRXGate and QuantumCircuit.prx.
Full details: Linked Issues check
Explanation
Issue #673 requires Qrisp SXGate and SXDGGate to match Qiskit’s global-phase convention, including in controlled use. The PR sets their global phases to π/4 and −π/4, accounts for global phase in controlled-gate synthesis, and adds matrix, controlled-gate, and Qiskit round-trip tests.
Full details: Out of Scope Changes check
Explanation
The RGate/PRXGate and U1/RZ changes match the current PR description. The controlled-gate, PennyLane, Catalyst, basis-change, converter, and test changes support the stated gate-matrix and conversion fixes. The summary shows no demonstrated unrelated change.
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Actionable comments posted: 2
🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @src/qrisp/circuit/standard_operations.py:
- Line 590: Update the rx/sx/sx_dg branch of multi_controlled_u3_circ to
synthesize u3_gate.global_phase on the active control subspace for SXGate and
SXDGGate, except when using gray_pt or gray_pt_inv; preserve the existing theta
synthesis.
Review comments at
@tests/circuit_tests/operation_tests/test_standard_operations.py:
- Line 69: Update the two SX test docstrings to describe the phase-corrected
SXGate convention represented by the assertions: SXGate is not described as
RX(π/2), and SX @ SX is described as X rather than −i·X. Leave the assertions
unchanged.
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Thanks for the fixes! The new matrices themselves check out (R, SX/SX† and the controlled SX). I left a few comments below on inverses, the conversions and some related gate code that still needs attention.
Separate from the gate fixes: while going through this PR I noticed that qiskit_converter.py as a whole could use some love. convert_to_qiskit and convert_from_qiskit are each well over 100 lines and do many different things in a single loop, and create_qiskit_instruction is a very long if/elif chain. The issues found in this PR show how easily things slip through in there.
Could you take this on in a separate follow-up PR? Let's keep this one focused on the gate fixes. Rough goals:
shorter, more readable functions, with the individual steps pulled out into smaller helper functions
type hints throughout
How exactly you structure it is up to you. Have a look around the other converters for inspiration, and feel free to sketch your idea here or in a draft PR before going all in. Since this should be a pure refactor, it's worth making sure the converter is well covered by tests first, so you can be confident nothing changes behaviour. You'll probably stumble over some dead code along the way, too 🙂
Separate from the gate fixes: while going through this PR I noticed that qiskit_converter.py as a whole could use some love. convert_to_qiskit and convert_from_qiskit are each well over 100 lines and do many different things in a single loop, and create_qiskit_instruction is a very long if/elif chain. The issues found in this PR show how easily things slip through in there.
Could you take this on in a separate follow-up PR? Let's keep this one focused on the gate fixes. Rough goals:
* shorter, more readable functions, with the individual steps pulled out into smaller helper functions
* type hints throughout
How exactly you structure it is up to you. Have a look around the other converters for inspiration, and feel free to sketch your idea here or in a draft PR before going all in. Since this should be a pure refactor, it's worth making sure the converter is well covered by tests first, so you can be confident nothing changes behaviour. You'll probably stumble over some dead code along the way, too 🙂
Yeah that's what I was working on, I just can't stack pr's yet as i am not a committer :D
I didn't focus on type hints though, good point!
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @tests/jax_tests/test_catalyst_interface.py:
- Line 186: Format the test_sx_catalyst() definition and add the required blank
lines after the preceding test so the file conforms to the project’s Ruff
formatting style.
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In IQM language this gate is called PRX. It would probably make sense to not have this duplicated (i.e. remove RGate, move PRXGate into the standard operations).
Try pushing an empty commit to trigger a fresh docs build. Another option could be to rebase your branch to the changes on main to trigger a fresh build.
Not sure what the issue is. If it comes up again after re-triggering the build, will look into it.
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Actionable comments posted: 1
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⚠️ Outside diff range comments (1)
Minor · Add a blank line before the (PR #949 ...) reference. · changelog-dev.rst:584-585
documentation/source/general/changelog/changelog-dev.rst:584-585 Minor · Maintainability & Code Quality · Quick win
Add a blank line before the (PR #949 ...) reference.
The nested bullet list ends at Line 584. Line 585 starts at the same indentation as the nested bullet markers but has no marker. It follows the list without a blank line. Docutils reports this as "Bullet list ends without a blank line; unexpected unindent". The docs build workflow treats warnings as errors, so this can fail the documentation build.
Other entries in this file, such as Lines 488-489, already put a blank line before the PR reference.
📝 Proposed fix
- ``U1Gate`` now converts to Qiskit's ``RZGate`` instead of ``PhaseGate``,
since Qrisp's ``U1`` is an RZ rotation.
+
(`PR #949 <https://github.com/eclipse-qrisp/Qrisp/pull/949>`_).
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Review comment at @documentation/source/general/changelog/changelog-dev.rst
around lines 584 - 585:
Add a blank line between the nested bullet list describing the U1Gate conversion
and the PR #949 reference in the changelog entry. Preserve the existing text and
indentation.
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @src/qrisp/interface/converter/pennylane_converter.py:
- Around line 77-79: Update the gate-conversion flow that invokes the PRX
descriptor’s param_fn so controlled operations pass their base operation for
parameter extraction, while preserving the wrapper for controlled-gate handling.
Add a conversion test for controlled PRXGate to verify its parameters are
extracted without an AttributeError.
---
Outside diff comments:
Review comments at @documentation/source/general/changelog/changelog-dev.rst:
- Around line 584-585: Add a blank line between the nested bullet list
describing the U1Gate conversion and the PR #949 reference in the changelog
entry. Preserve the existing text and indentation.
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Check the docs build locally. I think there might be an issue with something in the docs build which is why RTD build is failing. You should get a better error locally.
Fix incorrect gates implementation (i.e: use the correct matrices).
This covers RGate, SX, SX_dag gates.
Also the U1 maps to an RZ Gate in qrisp but maps to a phase gate in
qiskit, so necessary global phase is now added when doing the mapping.
After the R gate fix, RGate(theta, phi) and PRXGate(theta, phi) are the
same gate, U3(theta, phi - pi/2, pi/2 - phi). Keeping both meant two
names, two parameter conventions and two converter mappings for one
gate, so PRXGate becomes the single implementation.
Deprecations (both emit QrispDeprecationWarning and keep working):
- RGate is now a thin PRXGate subclass. RGate(theta, phi) builds
PRXGate(theta, phi), so the operation is named "prx" instead of "r"
and stores its angles as alpha and beta.
- QuantumCircuit.r forwards to the new QuantumCircuit.prx.
Supporting changes:
- Move PRXGate from passes/convert_to_prx.py to standard_operations.py,
which convert_to_prx now imports from. Existing imports keep working.
- Give PRXGate default angles of 0 and add it to op_list, so the Qiskit
converter can register it. RGate is left out of op_list so that
importing qrisp does not emit the warning. Qiskit's "r" is still
imported as PRXGate.
- Rename the PennyLane mapping key from "r" to "prx" (same qml.Rot
formula), since no operation is named "r" anymore.
Tests and docs:
- Move the PRXGate tests from passes/test_PRXGate.py into
test_standard_operations.py, since they test the gate, not the pass.
The RGate unitary tests now test PRXGate directly, and TestRGate only
covers the deprecation.
- Add QuantumCircuit.prx to the docs and a changelog entry.
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Fix incorrect gates implementation and the mapping from qrisp's U1 gate to qiskit's U1; i.e: fix the matrices representing such gates.
This covers RGate, SX, SX_dag gates, and the mapping of the U1 gate when converting from qrisp to qiskit.
Description
Related Issues
Closes #673, #629
Related to #873
Type of Change
Breaking Change?
If yes, describe the impact and migration path:
What was changed?
SX,SX_dag gatesnow have a global phases applied to obtain the correct matrix.RGate's off-diagonals are updated with +-i factors. Concretely, the theta, phi, lambda params are updated.U1 gate mapping was adjusted by maintaining a 1-1 mapping from U1's qrisp implementation (RZ gate) to an RZ gate in qiskit.
Relevant tests are updated
How was it tested?
Existing tests pass, after being updated.
Screenshots / Output (if applicable)
Checklist
changelog-dev.rstReviewer Notes
Summary by CodeRabbit
Summary by CodeRabbit