updated v4 refs to main

Author: TysonRayJones

.github/workflows/audit.yml

@@ -13,10 +13,10 @@ name: audit
 on:
   push:
     branches:
-      - v4
+      - main
   pull_request:
     branches:
-      - v4
+      - main
 
 
 jobs:
@@ -41,7 +41,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       # compile QuEST using clang address sanitiser, foregoing all parallelisations
       - name: Configure CMake to use sanitiser
@@ -84,7 +84,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       # compile QuEST like normal albeit without parallelisations
       - name: Configure CMake
@@ -130,7 +130,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       # work in a build directory to reduce verbosity below
       - run: > 

.github/workflows/compile.yml

@@ -19,10 +19,10 @@ name: compile
 on:
   push:
     branches:
-      - v4
+      - main
   pull_request:
     branches:
-      - v4
+      - main
 
 
 jobs:
@@ -155,7 +155,7 @@ jobs:
 
       # download QuEST
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       # obtain OMP for Clang multithreading
       - name: Setup libomp 

.github/workflows/doc.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
       - name: Obtain copy of repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Install Graphviz (for circuit diagrams)
         uses: tlylt/install-graphviz@v1

.github/workflows/test_free.yml

@@ -13,10 +13,10 @@ name: test (free, serial)
 on:
   push:
     branches:
-      - v4
+      - main
   pull_request:
     branches:
-      - v4
+      - main
 
 
 jobs:
@@ -59,7 +59,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       # compile serial unit tests, optionally include deprecated test
       - name: Configure CMake

.github/workflows/test_paid.yml

@@ -5,13 +5,12 @@
 # - 16c/min for each ARM runner (OMP, MPI)
 # - 7c/min for each GPU runner (CUDA, cuQuantum)
 # where [setup, compile, run] take approximately
-# - omp: 40s, 70s,  145s  = 4m30s  = $0.68
-# - mpi: 85s, 124s, 1050s = 21m    = $3.36
-# - gpu: 30s, 150s, 490s  = 11m15s = $0.78
-# - cuq: 57s, 125s, 490s  = 11m    = $0.78
-# - mix: 51s, 150s, 550s  = 12m30s = $0.88
-# Ergo execution of this workflow costs ~$6.50.
-# Each bug costs me a Le Pointu lavender coffee!
+# - omp: 40s, 110s, 160s  = 5m10s  = $0.83
+# - mpi: 85s, 180s, 1570s = 30m    = $4.80
+# - gpu: 30s, 180s, 760s  = 16m20s = $1.14
+# - cuq: 57s, 160s, 770s  = 16m50s = $1.18
+# - mix: 51s, 180s, 548s  = 13m    = $0.91
+# Ergo execution of this workflow costs ~ $9.
 # 
 # @author Tyson Jones
 
@@ -96,7 +95,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Setup CMake
         run: sudo apt-get install -y cmake
@@ -217,7 +216,7 @@ jobs:
     # perform the job
     steps:
       - name: Get QuEST
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Setup CMake
         run: sudo apt-get install -y cmake

README.md

@@ -7,22 +7,12 @@
 -->
 
 
-
-<!-- TODO: 
- update all instances of
- /v4/
- within this README to
- master/main/active branc
- -->
-
-
-
 <!-- banner and top badges (centered) -->
 <div align="center">
 
   <!-- banner -->
   <a href="https://quest.qtechtheory.org">
-    <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/banner.png" alt="The QuEST logo" width=400>
+    <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/banner.png" alt="The QuEST logo" width=400>
   </a>
 
   <!-- TODO: restore CI 'compilation/test pass' badge! -->
@@ -74,12 +64,12 @@ In particular, QuEST `v4` was made possible through the support of the UK Nation
 
 <div align="center">
 
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/nqcc.png" alt="NQCC" height=30> &nbsp;
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/amd.png" alt="AMD" height=25> &nbsp;
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/nvidia.png" alt="NVIDIA" height=25> &nbsp;
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/qmt.png" alt="Quantum Motion" height=25> &nbsp;
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/edinburgh.png" alt="University of Edinburgh" height=25> &nbsp;
-  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/v4/utils/docs/logos/oxford.png" alt="University of Oxford" height=28> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/nqcc.png" alt="NQCC" height=30> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/amd.png" alt="AMD" height=25> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/nvidia.png" alt="NVIDIA" height=25> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/qmt.png" alt="Quantum Motion" height=25> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/edinburgh.png" alt="University of Edinburgh" height=25> &nbsp;
+  <img src="https://raw.githubusercontent.com/QuEST-Kit/QuEST/refs/heads/main/utils/docs/logos/oxford.png" alt="University of Oxford" height=28> &nbsp;
 
 </div>
 
@@ -265,7 +255,7 @@ See the [docs](docs/README.md) for enabling acceleration and running the unit te
 
 ## ❤  Acknowledgements
 
-We sincerely thank the following external contributors to QuEST.
+In addition to QuEST's [authors](AUTHORS.txt), we sincerely thank the following external contributors to QuEST.
 
 - [Jakub Adamski](https://github.com/jjacobx) for optimising distributed communication of max-size messages.
 - [Bruno Villasenor Alvarez](https://github.com/bvillasen) of [AMD](https://www.amd.com/en.html) for porting the v3 GPU backend to [HIP](https://github.com/ROCm-Developer-Tools/HIP), for compatibility with AMD GPUs.
@@ -287,8 +277,14 @@ We sincerely thank the following external contributors to QuEST.
 - [QuESTlink](https://questlink.qtechtheory.org)   <br>
   a Mathematica package enabling symbolic circuit manipulation, analytic simulation, visualisation and high performance simulation with remote accelerated hardware.
 
-- [pyQuEST](https://github.com/rrmeister/pyQuEST/tree/master)   <br>
-  a python interface to QuEST, based on Cython, developed within the [QTechTheory](https://qtechtheory.org) group. Please note, pyQuEST is currently in the alpha stage.
+- [pyQuEST](https://github.com/rrmeister/pyQuEST)   <br>
+  a python interface to QuEST, based on Cython, developed by [Richard Meister](https://github.com/rrmeister) within the [QTechTheory](https://qtechtheory.org) group.
+
+- [QuEST.jl](https://github.com/ediparquantum/QuEST.jl) <br>
+  a Julia interface to QuEST, developed by [Jonathan Miller](https://github.com/fieldofnodes).
+
+- [qoqo-quest](https://github.com/HQSquantumsimulations/qoqo-quest) <br>
+  a Rust interface to QuEST, developed by [HQS Quantum Simulations](https://quantumsimulations.de/).
 
 - [PyQuEST-cffi](https://github.com/HQSquantumsimulations/PyQuEST-cffi)   <br>
-  a python interface to QuEST based on cffi developed by HQS Quantum Simulations. Please note, PyQuEST-cffi is currently in the alpha stage and not an official QuEST project.
+  a python interface to QuEST developed by [HQS Quantum Simulations](https://quantumsimulations.de/).