Prepare 1.2.1 release

Cargo.toml

@@ -3,7 +3,7 @@ members = ["crates/*"]
 resolver = "2"
 
 [workspace.package]
-version = "1.2.0"
+version = "1.2.1"
 edition = "2021"
 rust-version = "1.70"  # Keep in sync with README.md and rust-toolchain.toml.
 license = "Apache-2.0"

docs/conf.py

@@ -32,7 +32,7 @@
 # The short X.Y version
 version = "1.2"
 # The full version, including alpha/beta/rc tags
-release = "1.2.0"
+release = "1.2.1"
 
 language = "en"
 

qiskit/VERSION.txt

@@ -1 +1 @@
-1.2.0
+1.2.1

releasenotes/notes/adjust-neato-settings-3adcc0ae9e245ce9.yaml → releasenotes/notes/1.2/adjust-neato-settings-3adcc0ae9e245ce9.yaml

@@ -1,6 +1,6 @@
 ---
 fixes:
   - |
-    Fixes an issue with the visualizations of some backends/coupling maps that showed as folded on their own. The
+    Fixed an issue with the visualizations of some backends/coupling maps that showed as folded on their own. The
     `default ``neato`` setting <https://graphviz.org/docs/layouts/neato/>`_ works well in most cases. However,
     ``prism`` overlap returns a more regular layout for other scenarios.

releasenotes/notes/1.2/fix-2q-basis-decomposer-non-std-kak-gate-edc69ffb5d9ef302.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a bug in :class:`.TwoQubitBasisDecomposer` where the Rust-based code
+    would panic if the given KAK gate was not a default version of the standard gates (for example, using ``CXGate(ctrl_state=0)``).
+    Fixed `#12998 <https://github.com/Qiskit/qiskit/issues/12998>`__.

releasenotes/notes/fix-InstructionDurations-b47a9770b424d7a0.yaml → releasenotes/notes/1.2/fix-InstructionDurations-b47a9770b424d7a0.yaml

@@ -2,4 +2,4 @@
 fixes:
   - |
     Fixed a bug where :meth:`.InstructionDurations.from_backend` did not work for :class:`.BackendV2` backends.
-    Fixed `#12760 <https://github.com/Qiskit/qiskit/issues/12760>`.
+    Fixed `#12760 <https://github.com/Qiskit/qiskit/issues/12760>`__.

releasenotes/notes/fix-cu-rust-6464b6893ecca1b3.yaml → releasenotes/notes/1.2/fix-cu-rust-6464b6893ecca1b3.yaml

@@ -2,7 +2,7 @@
 fixes:
   - |
     Fixed the definition of the :class:`.CUGate` matrix in Rust-space. 
-    While this was not noticable while handling the :class:`.CUGate` purely on 
+    While this was not noticable when handling the :class:`.CUGate` purely on the
     Python side, this had knock-on effects when transpiler passes were using the 
     Rust representation, such as could happen in :class:`.Consolidate2qBlocks`.
     Fixed `#13118 <https://github.com/Qiskit/qiskit/issues/13118>`__.

releasenotes/notes/fix-hoare-opt-56d1ca6a07f07a2d.yaml → releasenotes/notes/1.2/fix-hoare-opt-56d1ca6a07f07a2d.yaml

@@ -3,3 +3,4 @@ fixes:
   - |
     Fixed a bug in :class:`.HoareOptimizer` where a controlled gate was simplified
     by removing its controls but the new gate was not handled correctly.
+    Fixed `#13079 <https://github.com/Qiskit/qiskit/issues/13079>`__.

releasenotes/notes/1.2/fix-negative-seed-pm-2813a62a020da115.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    :func:`.generate_preset_pass_manager` now correctly raises an exception,
+    if ``seed_transpiler`` is set to an invalid value (i.e., it is not a non-negative integer).
+    Fixed `#12938 <https://github.com/Qiskit/qiskit/issues/12938>`__.

releasenotes/notes/fix-sabre-releasevalve-7f9af9bfc0482e04.yaml → releasenotes/notes/1.2/fix-sabre-releasevalve-7f9af9bfc0482e04.yaml

@@ -1,7 +1,7 @@
 ---
 fixes:
   - |
-    Fixed an edge case in :class:`.SabreLayout`, where in rare cases on large
+    Fixed an edge case in :class:`.SabreLayout`, where, in rare cases on large
     devices and challenging circuits, the routing would fail. This was due to the 
     release valve making more than one two-qubit gate routable, where only one was expected.
     Fixed `#13081 <https://github.com/Qiskit/qiskit/issues/13081>`__.

releasenotes/notes/1.2/fix-split-2q-unitaries-custom-gate-d10f7670a35548f4.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a bug in :class:`.Split2QUnitaries` where it would fail to run on circuits
+    with custom :class:`.Gate` objects that did not implement ``__array__``.
+    See `#12970 <https://github.com/Qiskit/qiskit/issues/12970>`__.

releasenotes/notes/fix-synth-qregs-7662681c0ff02511.yaml → releasenotes/notes/1.2/fix-synth-qregs-7662681c0ff02511.yaml

@@ -3,5 +3,6 @@ fixes:
   - |
     Fixed a bug where various synthesis methods created circuits without quantum or
     classical registers. This also affected functions that internally used the synthesis
-    methods, such as :meth:`.Clifford.to_circuit`.
+    methods, such as :meth:`.Clifford.to_circuit`. While the circuits were valid, this could
+    cause issues when comparing circuits with registers.
     Fixed `#13041 <https://github.com/Qiskit/qiskit/issues/13041>`__.

releasenotes/notes/1.2/fix_initialize_gates_to_uncompute-d0dba6a642d07f30.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed a bug that caused the method :meth:`.Initialize.gates_to_uncompute` fail.
+    Fixed `#12969 <https://github.com/Qiskit/qiskit/issues/12969>`__.

releasenotes/notes/1.2/prepare-1.2.1-511ae054e7db7e41.yaml

@@ -0,0 +1,3 @@
+---
+prelude: >
+    Qiskit 1.2.1 is a minor bugfix release for the 1.2 series.