Update changelog for version release

CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.2] - 2026-04-07
+
+### Fixed
+- Exact scalar reduction during sum/product operations to prevent underflows/overflows of int32 on large diagrams. Unfortunately, this change comes with a 2x performance overhead, but results in more stable numerical results (#93)
+- Normalization issues for circuits with arbitrary rotation gates now raise a warning instead of an error (#91)
+- Parsing errors for invalid Stim circuits now raise useful exceptions (#91)
+
+### Added
+- `SPP` and `SPP_DAG` instructions — generalized S gate that phases the -1 eigenspace of Pauli product observables by i or -i. Supports multi-qubit Pauli products and inverted targets (#97)
+- `MXX`, `MYY`, `MZZ` two-qubit parity measurement instructions, delegating to existing MPP infrastructure. Also adds `II_ERROR` support (#96)
+- `MPAD` instruction for padding the measurement record with fixed bit values (#95)
+
+
 ## [0.1.1] - 2026-04-01
 
 ### Added

docs/demos/from_stim_to_tsim.ipynb

@@ -160,13 +160,41 @@
    "cell_type": "markdown",
    "id": "13",
    "metadata": {},
+   "source": [
+    "### Decomposition strategies\n",
+    "\n",
+    "Tsim supports three stabilizer rank decomposition strategies: `\"cat5\"` (default), `\"bss\"`, and `\"cutting\"`. The strategy can be passed to `compile_sampler` or `compile_detector_sampler`:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "14",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "c.compile_detector_sampler(strategy=\"cutting\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "15",
+   "metadata": {},
+   "source": [
+    "Different strategies can yield different performance depending on the circuit structure. If sampling is slow, it can be worth trying an alternative strategy."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "16",
+   "metadata": {},
    "source": [
     "### Visualization methods"
    ]
   },
   {
    "cell_type": "markdown",
-   "id": "14",
+   "id": "17",
    "metadata": {},
    "source": [
     "Tsim supports a subset of Stim's visualization methods. Since Tsim is based on ZX diagrams, it also provides visualization via `pyzx`."
@@ -175,7 +203,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "15",
+   "id": "18",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -196,7 +224,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "16",
+   "id": "19",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -206,7 +234,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "17",
+   "id": "20",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -215,7 +243,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "18",
+   "id": "21",
    "metadata": {},
    "source": [
     "It can be interesting to look at the ZX diagram of more advanced Stim programs. For example, the following program measures a qubit and records the flipped measurement outcome. Based on this outcome, an X gate is applied to a different qubit:"
@@ -224,7 +252,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "19",
+   "id": "22",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -236,15 +264,15 @@
   },
   {
    "cell_type": "markdown",
-   "id": "20",
+   "id": "23",
    "metadata": {},
    "source": [
     "### `REPEAT` instructions are flattened"
    ]
   },
   {
    "cell_type": "markdown",
-   "id": "21",
+   "id": "24",
    "metadata": {},
    "source": [
     "Tsim does not support `REPEAT` instructions. Any `REPEAT` instructions will be flattened."
@@ -253,7 +281,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "22",
+   "id": "25",
    "metadata": {},
    "outputs": [],
    "source": [

src/tsim/__init__.py

@@ -14,7 +14,7 @@
 - `utils/`: Utility functions for visualization and linear algebra.
 """
 
-__version__ = "0.1.0"
+__version__ = "0.1.2"
 
 from tsim.circuit import Circuit as Circuit
 from tsim.sampler import (