Prepare 2.1.0 release (#14565)

* Version update and first pass at the release notes

* Update releasenotes/notes/2.1/Added-random-circuit-from-graph-95c22eeabdea89d0.yaml

Co-authored-by: Rebecca Dimock <[email protected]>

* Apply comments from Becky's review

* Fix broken links and other formatting issues

* Apply fixes after proofreading

* Update feature notes

This commit goes through the new feature release notes and updates and
expands on them for clarity.

* Update other notes

* Update deprecation notes

* Update upgrade notes

* Update C API target note

* Add prelude

* Refine circuit library release note

Remove the mention of a migration guide

* Address review comments

* Remove duplicate sphinx directives

* Reword PauliLindbladMap note

* Fixup PauliLindbladMap wording

* Update releasenotes/notes/2.1/prepare-2.1.0-409d24ecbe277062.yaml

Co-authored-by: Matthew Treinish <[email protected]>

* Remove duplicate release notes from 2.0.x

* Resolve Pauli cross-reference in a release note

* Update fix notes

---------

Co-authored-by: Rebecca Dimock <[email protected]>
Co-authored-by: Matthew Treinish <[email protected]>
Co-authored-by: Jake Lishman <[email protected]>

Author: 4 people

Cargo.lock

@@ -3,7 +3,7 @@ members = ["crates/*"]
 resolver = "2"
 
 [workspace.package]
-version = "2.1.0-rc1"
+version = "2.1.0"
 edition = "2021"
 rust-version = "1.79"  # Keep in sync with README.md, rust-toolchain.toml, and tools/install_rust_msrv.sh
 license = "Apache-2.0"

Cargo.toml

@@ -1,3 +1,5 @@
+.. _C_API:
+
 ===========================
 Qiskit C API (``qiskit.h``)
 ===========================

docs/cdoc/index.rst

@@ -32,7 +32,7 @@
 # The short X.Y version
 version = "2.1"
 # The full version, including alpha/beta/rc tags
-release = "2.1.0rc1"
+release = "2.1.0"
 
 language = "en"
 

docs/conf.py

@@ -10,4 +10,4 @@ Qiskit |version| release notes
     `:earliest-version:` should be set to the rc1 release for the current minor release series. For example, the stable/1.1 branch should set it to 1.1.0rc1. If on `main`, set to the prior minor version's rc1, like `1.0.0rc1`.
 
 .. release-notes::
-   :earliest-version: 1.1.0rc1
+   :earliest-version: 2.1.0rc1

docs/release_notes.rst

@@ -1 +1 @@
-2.1.0rc1
+2.1.0

qiskit/VERSION.txt

@@ -377,7 +377,7 @@ class PiecewiseChebyshevGate(Gate):
             from qiskit import QuantumCircuit
             from qiskit.circuit.library.arithmetic import PiecewiseChebyshevGate
 
-            f_x, num_state_qubits, degree, breakpoints = lambda x: np.arcsin(1 / x), 2, 2, [2, 4]
+            f_x, num_state_qubits, degree, breakpoints = lambda x: np.sin(1 / x), 2, 2, [2, 4]
             pw_approximation = PiecewiseChebyshevGate(f_x, num_state_qubits, degree, breakpoints)
 
             qc = QuantumCircuit(pw_approximation.num_qubits)

qiskit/circuit/library/arithmetic/piecewise_chebyshev.py

@@ -91,6 +91,7 @@
    Split2QUnitaries
    RemoveIdentityEquivalent
    ContractIdleWiresInControlFlow
+   OptimizeCliffordT
 
 Scheduling
 =============

qiskit/transpiler/passes/__init__.py

@@ -361,6 +361,10 @@ def run(self, high_level_object, coupling_map=None, target=None, qubits=None, **
    :no-inherited-members:
    :no-special-members:
 
+.. automodule:: qiskit.transpiler.passes.synthesis.clifford_unitary_synth_plugin
+   :no-inherited-members:
+   :no-special-members:
+
 
 High Level Synthesis
 --------------------

qiskit/transpiler/passes/synthesis/plugin.py

@@ -1,36 +1,35 @@
 ---
 features_circuits:
   - |
-    Added a function :func:`~qiskit.circuit.random.utils.random_circuit_from_graph` that generates a random circuit that 
-    induces the same interaction graph as the interaction graph specified by `interaction_graph`.
+    Added a function :func:`~qiskit.circuit.random.random_circuit_from_graph` that generates a random circuit that
+    induces the same interaction graph as the one specified by `interaction_graph`.
 
-    The probability of randomly drawing an edge from the interaction graph as a two-qubit gate can be set by the 
-    user in the weight attribute of an edge in the input interaction graph. If the user does not set the probability, 
-    each edge is drawn uniformly, i.e. each two-qubit gate represented by an edge in the interaction graph has the 
-    same probability of getting added to the random circuit. If only a subset of edge probabilities are set, 
-    `ValueError` will be raised.
+    The probability of randomly drawing an edge from the interaction graph as a two-qubit gate can be set by the
+    user in an edge's weight attribute in the input interaction graph. If the user does not set the probability,
+    each edge is drawn uniformly.  That is, each two-qubit gate represented by an edge in the interaction graph has the
+    same probability of getting added to the random circuit. If only a subset of edge probabilities are set,
+    ``ValueError`` will be raised.
 
-    This is an example where 'cp_map' is a list of edges with some arbitrary weights.
+    In this example, ``cp_map`` is a list of edges with arbitrary weights.
 
     .. plot::
       :include-source:
-        
+
         from qiskit.circuit.random.utils import random_circuit_from_graph
         import rustworkx as rx
         pydi_graph = rx.PyDiGraph()
         n_q = 5
         cp_map = [(0, 1, 0.18), (1, 2, 0.15), (2, 3, 0.15), (3, 4, 0.22)]
-        pydi_graph.add_nodes_from(range(n_q))
-        pydi_graph.add_edges_from(cp_map)
+        pydi_graph.extend_from_weighted_edge_list(cp_map)
         # cp_map can be passed in directly as interaction_graph
         qc = random_circuit_from_graph(interaction_graph = pydi_graph,
-          min_2q_gate_per_edge = 1, 
-          max_operands = 2, 
-          measure = True, 
-          conditional = True, 
-          reset = True, 
-          seed = 0, 
-          insert_1q_oper = True, 
+          min_2q_gate_per_edge = 1,
+          max_operands = 2,
+          measure = True,
+          conditional = True,
+          reset = True,
+          seed = 0,
+          insert_1q_oper = True,
           prob_conditional = 0.21,
           prob_reset = 0.1)
         qc.draw(output='mpl')