diff --git a/.github/workflows/benchmark-comment.yml b/.github/workflows/benchmark-comment.yml
new file mode 100644
index 0000000..e873dbf
--- /dev/null
+++ b/.github/workflows/benchmark-comment.yml
@@ -0,0 +1,64 @@
+# To workaroud https://github.com/actions/first-interaction/issues/10 in a secure way,
+# we take the following steps to generate and comment a performance benchmark result:
+# 1. first "performance tracking" workflow will generate the benchmark results in an unprivileged environment triggered on `pull_request` event
+# 2. then this "performance tracking (comment)" workflow will show the result to us as a PR comment in a privileged environment
+# Note that this workflow can only be modifed by getting checked-in to the default branch
+# and thus is secure even though this workflow is granted with write permissions, etc.
+# xref: https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+
+name: Performance tracking (comment)
+
+on:
+  workflow_run:
+    workflows:
+      - performance tracking
+    types:
+      - completed
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    #runs-on: self-hosted
+    if: >
+      ${{ github.event.workflow_run.event == 'pull_request' &&
+          github.event.workflow_run.conclusion == 'success' }}
+    steps:
+      - uses: actions/checkout@v4
+
+      # restore records from the artifacts
+      - uses: dawidd6/action-download-artifact@v3
+        with:
+          workflow: benchmark.yml
+          name: performance-tracking
+          workflow_conclusion: success
+      - name: output benchmark result
+        id: output-result-markdown
+        run: |
+          echo ::set-output name=body::$(cat ./benchmark-result.artifact)
+      - name: output pull request number
+        id: output-pull-request-number
+        run: |
+          echo ::set-output name=body::$(cat ./pull-request-number.artifact)
+
+      # check if the previous comment exists
+      - name: find comment
+        uses: peter-evans/find-comment@v3
+        id: fc
+        with:
+          issue-number: ${{ steps.output-pull-request-number.outputs.body }}
+          comment-author: 'github-actions[bot]'
+          body-includes: Benchmark Result
+
+      # create/update comment
+      - name: create comment
+        if: ${{ steps.fc.outputs.comment-id == 0 }}
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          issue-number: ${{ steps.output-pull-request-number.outputs.body }}
+          body: ${{ steps.output-result-markdown.outputs.body }}
+      - name: update comment
+        if: ${{ steps.fc.outputs.comment-id != 0 }}
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          body: ${{ steps.output-result-markdown.outputs.body }}
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 0000000..34c65be
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,57 @@
+name: Performance tracking
+on:
+  pull_request:
+
+env:
+  PYTHON: ~
+
+jobs:
+  performance-tracking:
+    runs-on: ubuntu-latest
+    #runs-on: self-hosted
+    steps:
+      # setup
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: 'nightly'
+      - uses: julia-actions/julia-buildpkg@latest
+      - name: install dependencies
+        run: julia -e 'using Pkg; pkg"add PkgBenchmark BenchmarkCI@0.1"'
+
+      # run the benchmark suite
+      - name: run benchmarks
+        run: |
+          julia -e '
+            using BenchmarkCI
+            BenchmarkCI.judge()
+            BenchmarkCI.displayjudgement()
+            '
+
+      # generate and record the benchmark result as markdown
+      - name: generate benchmark result
+        run: |
+          body=$(julia -e '
+          using BenchmarkCI
+
+          let
+              judgement = BenchmarkCI._loadjudge(BenchmarkCI.DEFAULT_WORKSPACE)
+              title = "Benchmark Result"
+              ciresult = BenchmarkCI.CIResult(; judgement, title)
+              BenchmarkCI.printcommentmd(stdout::IO, ciresult)
+          end
+          ')
+          body="${body//'%'/'%25'}"
+          body="${body//$'\n'/'%0A'}"
+          body="${body//$'\r'/'%0D'}"
+          echo $body > ./benchmark-result.artifact
+
+      # record the pull request number
+      - name: record pull request number
+        run: echo ${{ github.event.pull_request.number }} > ./pull-request-number.artifact
+
+      # save as artifacts (performance tracking (comment) workflow will use it)
+      - uses: actions/upload-artifact@v4
+        with:
+          name: performance-tracking
+          path: ./*.artifact
diff --git a/.github/workflows/changelog-enforcer.yml b/.github/workflows/changelog-enforcer.yml
new file mode 100644
index 0000000..b7a2038
--- /dev/null
+++ b/.github/workflows/changelog-enforcer.yml
@@ -0,0 +1,15 @@
+name: "Changelog Enforcer"
+on:
+  pull_request:
+    # The specific activity types are listed here to include "labeled" and "unlabeled"
+    # (which are not included by default for the "pull_request" trigger).
+    # This is needed to allow skipping enforcement of the changelog in PRs with specific labels,
+    # as defined in the (optional) "skipLabels" property.
+    types: [opened, synchronize, reopened, ready_for_review, labeled, unlabeled]
+
+jobs:
+  # Enforces the update of a changelog file on every pull request 
+  changelog:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: dangoslen/changelog-enforcer@v3
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac7a18b..ea5592a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,9 +4,11 @@ on:
     branches: [master, main]
     tags: ["*"]
   pull_request:
+env:
+  PYTHON: ~
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    name: Julia ${{ matrix.version }} - t=${{ matrix.threads }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -15,12 +17,16 @@ jobs:
           - '1.6'
           - '1.7'
           - '1.8'
+          - '1.9'
+          - '1.10'
           - '1'
           - nightly
         os:
           - ubuntu-latest
           - windows-latest
           - macOS-latest
+        threads:
+          - '1'
         arch:
           - x64
     steps:
@@ -29,22 +35,16 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v4
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/cache@v1
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+        env:
+          JULIA_NUM_THREADS: ${{ matrix.threads }}
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
   docs:
     name: Documentation
     runs-on: ubuntu-latest
@@ -53,8 +53,10 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
+      - uses: julia-actions/cache@v1
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-docdeploy@v1
         env:
+          GKSwstype: nul # Fix for Plots with GR backend.
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/.github/workflows/downgrade.yml b/.github/workflows/downgrade.yml
new file mode 100644
index 0000000..61b4889
--- /dev/null
+++ b/.github/workflows/downgrade.yml
@@ -0,0 +1,29 @@
+name: Downgrade
+on:
+  pull_request:
+    branches: [master, main]
+    paths-ignore:
+      - 'docs/**'
+  push:
+    branches: [master, main]
+    paths-ignore:
+      - 'docs/**'
+env:
+  PYTHON: ~
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: ['1.9']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+      - uses: cjdoris/julia-downgrade-compat-action@v1
+        with:
+          skip: Pkg,TOML,InteractiveUtils,Random,LinearAlgebra,Dates
+      - uses: julia-actions/cache@v1
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
\ No newline at end of file
diff --git a/.github/workflows/invalidations.yml b/.github/workflows/invalidations.yml
new file mode 100644
index 0000000..e6aade0
--- /dev/null
+++ b/.github/workflows/invalidations.yml
@@ -0,0 +1,41 @@
+name: Invalidations
+
+on:
+  pull_request:
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: always.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  evaluate:
+    # Only run on PRs to the default branch.
+    # In the PR trigger above branches can be specified only explicitly whereas this check should work for master, main, or any other default branch
+    if: github.base_ref == github.event.repository.default_branch
+    runs-on: ubuntu-latest
+    steps:
+    - uses: julia-actions/setup-julia@v1
+      with:
+        version: '1'
+    - uses: actions/checkout@v4
+    - uses: julia-actions/cache@v1
+    - uses: julia-actions/julia-buildpkg@v1
+    - uses: julia-actions/julia-invalidations@v1
+      id: invs_pr
+
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.repository.default_branch }}
+    - uses: julia-actions/julia-buildpkg@v1
+    - uses: julia-actions/julia-invalidations@v1
+      id: invs_default
+    
+    - name: Report invalidation counts
+      run: |
+        echo "Invalidations on default branch: ${{ steps.invs_default.outputs.total }} (${{ steps.invs_default.outputs.deps }} via deps)" >> $GITHUB_STEP_SUMMARY
+        echo "This branch: ${{ steps.invs_pr.outputs.total }} (${{ steps.invs_pr.outputs.deps }} via deps)" >> $GITHUB_STEP_SUMMARY
+    - name: Check if the PR does increase number of invalidations
+      if: steps.invs_pr.outputs.total > steps.invs_default.outputs.total
+      run: exit 1
\ No newline at end of file
diff --git a/.github/workflows/spelling.yml b/.github/workflows/spelling.yml
new file mode 100644
index 0000000..d9ee073
--- /dev/null
+++ b/.github/workflows/spelling.yml
@@ -0,0 +1,15 @@
+name: Spell Check
+
+on: [pull_request]
+
+jobs:
+  typos-check:
+    name: Spell Check with Typos
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Actions Repository
+        uses: actions/checkout@v4
+      - name: Check spelling
+        uses: crate-ci/typos@master
+        with:
+            config: .typos.toml
\ No newline at end of file
diff --git a/.typos.toml b/.typos.toml
new file mode 100644
index 0000000..f4ceaa3
--- /dev/null
+++ b/.typos.toml
@@ -0,0 +1,7 @@
+[default.extend-words]
+ket = "ket"
+
+[type.ipynb]
+# It detects false possitives in the base64 encoded images inside notebooks
+extend-glob = ["*.ipynb", "*.tex"]
+check-file = false
diff --git a/README.md b/README.md
index bb272a2..5a66a6f 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ And expanded for easier identification:
 
 The general purpose `MultiControl(controls, ocontrols, targets, targetXs)` can be used to create an arbitrary combination of muticontrol multiqubit gates. Each argument lists the indices of qubits that should get a certain symbol: `controls` is filled circles, `ocontrols` is empty circles, `targets` is the NOT symbol, and `targetXs` is the X symbols.
 
-For named controled gates use `MultiControlU(str, controls, ocontrols, targets)`.
+For named controlled gates use `MultiControlU(str, controls, ocontrols, targets)`.
 
 For noise events, you can use `Noise(targets)` or `NoiseAll()`.