Merge branch 'main' of https://github.com/Qiskit/qiskit into deprecat…

…e-accidents

CODE_OF_CONDUCT.md

@@ -1,114 +1,3 @@
 # Code of Conduct
 
-## Our Pledge
-
-The Qiskit Community is dedicated to our values of treating every individual
-with respect and dignity. In the interest of fostering an open and welcoming
-environment, all participants, including attendees, speakers, sponsors,
-volunteers, online contributors, and IBM employees are expected to show
-courtesy for each other and our community by creating a harassment-free
-experience for everyone, regardless of age, personal appearance, disability,
-ethnicity, gender identity and expression, body size, level of experience,
-nationality, race, religion, caste, or sexual identity and orientation.
-Expected behavior applies to both online and offline engagement within the
-Qiskit Community.
-
-## Scope
-
-The purpose of this Code of Conduct is to define and enforce the values and
-conduct of contributors and participants in the Qiskit open source community.
-The Code of Conduct applies both within project spaces and in public spaces
-when an individual is engaging with the Qiskit open source community. Examples
-include attending a Qiskit event, contributing to online projects, commentary
-on Slack, or representing a project or community, including using an official
-project e-mail address, posting via an official social media account, or
-acting as an appointed representative at an online or offline event.
-Representation of a project may be further defined and clarified by project
-maintainers.
-
-## Our Standards
-
-Examples of behavior that contributes to creating a positive environment
-include:
-
-- Using welcoming and inclusive language
-- Being respectful of differing viewpoints, experiences, and cultures
-- Gracefully accepting constructive criticism
-- Focusing on what is best for the community
-- Showing empathy towards other community members
-- Being mindful of your surroundings and your fellow participants and listening
-  to others
-- Valuing the contributions of all participants
-- Engaging in collaboration before conflict
-- Pointing out unintentionally racist, sexist, casteist, or biased comments and
-  jokes made by community members when they happen
-
-Examples of unacceptable behavior by participants, even when presented as
-"ironic" or "joking," include:
-
-- The use of sexualized language or imagery and unwelcome physical contact,
-  sexual attention, or advances
-- Trolling, insulting/derogatory comments, and personal or political attacks
-- Public or private harassment, including offensive or degrading language
-- Publishing others' private information, such as a physical or electronic
-  address, without explicit permission. This includes any sort of "outing" of
-  any aspect of someone's identity without their consent.
-- "Doxxing," Publishing screenshots or quotes, especially from identity slack
-  channels, private chat, or public events, without all quoted users' explicit
-  consent.
-- Engaging in spamming activities, such as repeatedly sending unsolicited messages, LLMs (Large Language Models) output, advertisements, or promotional content to community members without previous IBM authorization.
-- Other conduct which could reasonably be considered inappropriate in a
-  professional setting
-
-## Responsibilities & Enforcement
-
-The entire Qiskit community is responsible for upholding the terms of the Code
-of Conduct in Qiskit Community events and spaces and reporting violations if
-they see them. The internal Qiskit team at IBM is ultimately responsible for
-clarifying the standards of acceptable behavior and enforcement, and is expected
-to take appropriate and fair corrective action in response to any instances of
-unacceptable behavior.
-
-If a participant or contributor engages in negative or harmful behavior, IBM
-will take any action they deem appropriate, including but not limited to
-issuing warnings, expulsion from an event with no refund, deleting comments,
-permanent banning from future events or online community, or calling local law
-enforcement. IBM has the right and responsibility to remove, edit, or reject
-comments, commits, code, wiki edits, issues, and other contributions that are
-not aligned to this Code of Conduct, or to temporarily or permanently ban any
-contributor or participant for other behaviors that they deem inappropriate,
-threatening, offensive, or harmful.
-
-If you see a Code of Conduct violation:
-
-1. If you feel comfortable, let the person know that what they did is not
-   appropriate and ask them to stop and/or edit or delete their message(s) or
-   comment(s).
-2. If the person does not immediately stop the behavior or correct the issue,
-   or if you're uncomfortable speaking up, flag a moderator and, if appropriate,
-   fill out the anonymous
-   [Code of Conduct violation form](https://airtable.com/shrl5mEF4Eun1aIDm).
-3. The Qiskit Community will open an investigation upon receiving your form
-   entry. When reporting, please include any relevant details, links,
-   screenshots, context, or other information that may be used to better
-   understand and resolve the situation.
-4. If the code of conduct violation occurs at an event and requires immediate
-   response or contains a concern about an individual attending an upcoming
-   event, contact the event's on-call Code of Conduct point of contact listed
-   in the event specific code of conduct document. If you don't feel comfortable
-   speaking to the point of contact in person, fill out a Code of Conduct
-   violation form entry and include the details of the event so that the Code of
-   Conduct enforcement board can contact the event's on-call Code of Conduct
-   point of contact.
-5. If an IBM employee witnesses a Code of Conduct violation at any time, such as
-   at events, in a Slack channel, or open source forums, it is their
-   responsibility to file a Code of Conduct violation report.
-
-This Code of Conduct does not supersede existing IBM corporate policies, such as
-the IBM Business Conduct Guidelines and IBM Business Partner Code of Conduct.
-IBM employees must follow IBM's Business Conduct Guidelines. IBM's business
-partners must follow the IBM Business Partner Code of Conduct. IBM employees
-concerned with a fellow IBMer's behavior should follow IBM's own internal HR
-reporting protocols, which include engaging the offending IBMer's manager and
-involving IBM Concerns and Appeals. IBM employees concerned with an IBM
-business partner's behavior should notify [email protected].
+All members of this project agree to adhere to the Qiskit Code of Conduct listed at [docs.quantum.ibm.com/open-source/code-of-conduct](https://docs.quantum.ibm.com/open-source/code-of-conduct)

CONTRIBUTING.md

@@ -17,6 +17,7 @@ community in this goal.
 * [Testing](#testing)
 * [Style and Lint](#style-and-lint)
 * [Building API docs locally](#building-api-docs-locally)
+  * [Troubleshooting docs builds](#troubleshooting-docs-builds)
 * [Development Cycle](#development-cycle)
   * [Branches](#branches)
   * [Release Cycle](#release-cycle)
@@ -651,21 +652,41 @@ rather than via `tox`. If you have installed the development packages in your py
 `pip install -r requirements-dev.txt`, then `ruff` and `black` will be available and can be run from
 the command line. See [`tox.ini`](tox.ini) for how `tox` invokes them.
 
+
 ## Building API docs locally
 
-If you have made changes to the API documentation, you can run the command below
-to build documentation locally to review the html output. 
-The easiest and recommended way to build the documentation is to use [**tox**](https://tox.readthedocs.io/en/latest/#):
+The API documentation is built with Sphinx.
+We recommend that you use [**tox**](https://tox.readthedocs.io/en/latest) to orchestrate this.
+Run a complete documentation build with
+```
+tox -e docs
+```
+
+The documentation output will be located at `docs/_build/html`.
+Open the `index.html` file there in your browser to find the main page.
+
+### Troubleshooting docs builds
 
+When you build documentation, you might get errors that look like
 ```
-tox -edocs
+ValueError: earliest-version set to unknown revision '1.0.0rc1'
 ```
+If so, you need to fetch Qiskit's `git` tags and stable branches, in order to fully build the release notes.
+To do this, run the command:
+```
+git fetch --tags upstream
+```
+where `upstream` is your name for the [git remote repository](https://git-scm.com/book/en/v2/Git-Basics-Working-with-Remotes) that corresponds to https://github.com/Qiskit/qiskit (this repository).
+You might need to re-run this command if Qiskit has issued a new release since the last time you built the documentation.
 
-Once you run this command, the output will be located at `docs/_build/html`.
-Then, open up the file `index.html` in your browser.
+Sometimes, you might get errors about "names not existing" or "failed to import" during the docs build, even when the test suite passes.
+This can mean that Sphinx's cache has become invalidated, but hasn't been successfully cleared.
+Use the command:
+```
+tox -e docs-clean
+```
+to fully clean out all documentation build artefacts and partial builds, and see if the problem persists.
 
-Sometimes Sphinx can get in a bad cache state. Run `tox -e docs-clean`
-to reset Sphinx's cache.
 
 ## Development cycle
 

Cargo.toml

@@ -14,6 +14,7 @@ license = "Apache-2.0"
 #
 # Each crate can add on specific features freely as it inherits.
 [workspace.dependencies]
+bytemuck = "1.16"
 indexmap.version = "2.2.6"
 hashbrown.version = "0.14.0"
 num-complex = "0.4"

crates/accelerate/src/convert_2q_block_matrix.rs

@@ -23,33 +23,32 @@ use numpy::{IntoPyArray, PyArray2, PyReadonlyArray2};
 use smallvec::SmallVec;
 
 use qiskit_circuit::bit_data::BitData;
-use qiskit_circuit::circuit_instruction::{operation_type_to_py, CircuitInstruction};
+use qiskit_circuit::circuit_instruction::CircuitInstruction;
 use qiskit_circuit::dag_node::DAGOpNode;
 use qiskit_circuit::gate_matrix::ONE_QUBIT_IDENTITY;
 use qiskit_circuit::imports::QI_OPERATOR;
-use qiskit_circuit::operations::{Operation, OperationType};
+use qiskit_circuit::operations::{Operation, OperationRef};
 
 use crate::QiskitError;
 
 fn get_matrix_from_inst<'py>(
     py: Python<'py>,
     inst: &'py CircuitInstruction,
 ) -> PyResult<Array2<Complex64>> {
-    match inst.operation.matrix(&inst.params) {
-        Some(mat) => Ok(mat),
-        None => match inst.operation {
-            OperationType::Standard(_) => Err(QiskitError::new_err(
-                "Parameterized gates can't be consolidated",
-            )),
-            OperationType::Gate(_) => Ok(QI_OPERATOR
-                .get_bound(py)
-                .call1((operation_type_to_py(py, inst)?,))?
-                .getattr(intern!(py, "data"))?
-                .extract::<PyReadonlyArray2<Complex64>>()?
-                .as_array()
-                .to_owned()),
-            _ => unreachable!("Only called for unitary ops"),
-        },
+    if let Some(mat) = inst.op().matrix(&inst.params) {
+        Ok(mat)
+    } else if inst.operation.try_standard_gate().is_some() {
+        Err(QiskitError::new_err(
+            "Parameterized gates can't be consolidated",
+        ))
+    } else {
+        Ok(QI_OPERATOR
+            .get_bound(py)
+            .call1((inst.get_operation(py)?,))?
+            .getattr(intern!(py, "data"))?
+            .extract::<PyReadonlyArray2<Complex64>>()?
+            .as_array()
+            .to_owned())
     }
 }
 
@@ -127,34 +126,22 @@ pub fn change_basis(matrix: ArrayView2<Complex64>) -> Array2<Complex64> {
 
 #[pyfunction]
 pub fn collect_2q_blocks_filter(node: &Bound<PyAny>) -> Option<bool> {
-    match node.downcast::<DAGOpNode>() {
-        Ok(bound_node) => {
-            let node = bound_node.borrow();
-            match &node.instruction.operation {
-                OperationType::Standard(gate) => Some(
-                    gate.num_qubits() <= 2
-                        && node
-                            .instruction
-                            .extra_attrs
-                            .as_ref()
-                            .and_then(|attrs| attrs.condition.as_ref())
-                            .is_none()
-                        && !node.is_parameterized(),
-                ),
-                OperationType::Gate(gate) => Some(
-                    gate.num_qubits() <= 2
-                        && node
-                            .instruction
-                            .extra_attrs
-                            .as_ref()
-                            .and_then(|attrs| attrs.condition.as_ref())
-                            .is_none()
-                        && !node.is_parameterized(),
-                ),
-                _ => Some(false),
-            }
-        }
-        Err(_) => None,
+    let Ok(node) = node.downcast::<DAGOpNode>() else {
+        return None;
+    };
+    let node = node.borrow();
+    match node.instruction.op() {
+        gate @ (OperationRef::Standard(_) | OperationRef::Gate(_)) => Some(
+            gate.num_qubits() <= 2
+                && node
+                    .instruction
+                    .extra_attrs
+                    .as_ref()
+                    .and_then(|attrs| attrs.condition.as_ref())
+                    .is_none()
+                && !node.is_parameterized(),
+        ),
+        _ => Some(false),
     }
 }
 

crates/accelerate/src/euler_one_qubit_decomposer.rs

@@ -743,7 +743,7 @@ pub fn compute_error_list(
         .iter()
         .map(|node| {
             (
-                node.instruction.operation.name().to_string(),
+                node.instruction.op().name().to_string(),
                 smallvec![], // Params not needed in this path
             )
         })
@@ -988,11 +988,10 @@ pub fn optimize_1q_gates_decomposition(
                 .iter()
                 .map(|node| {
                     if let Some(err_map) = error_map {
-                        error *=
-                            compute_error_term(node.instruction.operation.name(), err_map, qubit)
+                        error *= compute_error_term(node.instruction.op().name(), err_map, qubit)
                     }
                     node.instruction
-                        .operation
+                        .op()
                         .matrix(&node.instruction.params)
                         .expect("No matrix defined for operation")
                 })
@@ -1046,24 +1045,18 @@ fn matmul_1q(operator: &mut [[Complex64; 2]; 2], other: Array2<Complex64>) {
 
 #[pyfunction]
 pub fn collect_1q_runs_filter(node: &Bound<PyAny>) -> bool {
-    let op_node = node.downcast::<DAGOpNode>();
-    match op_node {
-        Ok(bound_node) => {
-            let node = bound_node.borrow();
-            node.instruction.operation.num_qubits() == 1
-                && node.instruction.operation.num_clbits() == 0
-                && node
-                    .instruction
-                    .operation
-                    .matrix(&node.instruction.params)
-                    .is_some()
-                && match &node.instruction.extra_attrs {
-                    None => true,
-                    Some(attrs) => attrs.condition.is_none(),
-                }
+    let Ok(node) = node.downcast::<DAGOpNode>() else {
+        return false;
+    };
+    let node = node.borrow();
+    let op = node.instruction.op();
+    op.num_qubits() == 1
+        && op.num_clbits() == 0
+        && op.matrix(&node.instruction.params).is_some()
+        && match &node.instruction.extra_attrs {
+            None => true,
+            Some(attrs) => attrs.condition.is_none(),
         }
-        Err(_) => false,
-    }
 }
 
 #[pymodule]