Prepare 2.3.0 release (#15514)

* Move release notes from 2.2 series

* Fixup release notes wording

* Add 2.3.0 prelude release note

* Bump version number to 2.3.0

* Reno suggestions

* Update releasenotes/notes/2.3/prepare-2.3.0-c735aee10b6289c9.yaml

* Hedge on the reasons for Qiskit 3.0

* Add notes on current system support

* Comment on new `QPY_VERSION`

* Remove first-person plural

* Use Julien's wording of the Clifford+T release note

Co-authored-by: Julien Gacon <[email protected]>

* Remove extraneous detail

* Comment on control flow in prelude

* Convert to single-qubit

* Split run-on sentence

* Apply Abby's copy-editing suggestions

* Move release notes to 2.3

* Update releasenotes/notes/2.3/prepare-2.3.0-c735aee10b6289c9.yaml

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

---------

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

Author: 3 people

Cargo.lock

@@ -3,7 +3,7 @@ members = ["crates/*"]
 resolver = "2"
 
 [workspace.package]
-version = "2.3.0-rc1"
+version = "2.3.0"
 edition = "2024"
 rust-version = "1.85"  # Keep in sync with README.md, rust-toolchain.toml, and tools/install_rust_msrv.sh
 license = "Apache-2.0"

Cargo.toml

@@ -21,11 +21,11 @@
 #define QISKIT_VERSION_MAJOR 2
 #define QISKIT_VERSION_MINOR 3
 #define QISKIT_VERSION_PATCH 0
-#define QISKIT_RELEASE_LEVEL QISKIT_RELEASE_LEVEL_RC
+#define QISKIT_RELEASE_LEVEL QISKIT_RELEASE_LEVEL_FINAL
 // For the final release, set the below to 0.
-#define QISKIT_RELEASE_SERIAL 1
+#define QISKIT_RELEASE_SERIAL 0
 
-#define QISKIT_VERSION "2.3.0-rc1"
+#define QISKIT_VERSION "2.3.0"
 
 #define QISKIT_GET_VERSION_HEX(major, minor, patch, level, serial)                                 \
     (((major) & 0xff) << 24 | ((minor) & 0xff) << 16 | ((patch) & 0xff) << 8 |                     \

crates/cext/include/qiskit/version.h

@@ -21,4 +21,4 @@ Qiskit |version| release notes
       though, which is typically `rc1` tags.
 
 .. release-notes::
-   :earliest-version: 2.2.0rc1
+   :earliest-version: 2.3.0rc1

docs/release_notes.rst

@@ -1 +1 @@
-2.3.0rc1
+2.3.0

qiskit/VERSION.txt

@@ -1,6 +1,6 @@
 ---
 fixes:
   - |
-    Fixes  the implementation of :meth:`~object.__deepcopy__` in class:`.QuantumCircuit`
+    Fixes  the implementation of :meth:`~object.__deepcopy__` in :class:`.QuantumCircuit`
     which did not deep-copy circuit parameters. As a consequence, mutating
     a :class:`.BoxOp` in a copied circuit no longer affects the original circuit.