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# QuAcK: an open-source software for emerging quantum electronic structure methods
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<img src="logo/logo_quack.png" width="250">
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# 🦆 QuAcK: Quantum Chemistry Prototyping Toolkit
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**Contributors:**
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- [Pierre-Francois Loos](https://pfloos.github.io/WEB_LOOS)
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- [Anthony Scemama](https://scemama.github.io)
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- [Enzo Monino](https://enzomonino.github.io)
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- [Antoine Marie](https://antoine-marie.github.io)
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- [Abdallah Ammar](https://scholar.google.com/citations?user=y437T5sAAAAJ&hl=en)
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- [Mauricio Rodriguez-Mayorga](https://scholar.google.com/citations?user=OLGOgQgAAAAJ&hl=es)
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- [Loris Burth](https://github.com/lburth)
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# What is it?
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**QuAcK** is a lightweight electronic structure program written in `Fortran 90`, developed at the [Laboratoire de Chimie et Physique Quantiques (LCPQ)](https://www.lcpq.ups-tlse.fr) in Toulouse, France. Originally designed as a platform for rapid prototyping of new ideas in quantum chemistry, QuAcK serves as a flexible and accessible environment for testing novel methods before integrating them more efficiently into larger-scale projects such as the [Quantum Package](https://quantumpackage.github.io/qp2/).
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QuAcK is an open-source, lightweight electronic structure program written in **Fortran 90**, developed at the [Laboratoire de Chimie et Physique Quantiques (LCPQ)](https://www.lcpq.ups-tlse.fr/) in Toulouse, France. Designed primarily for rapid prototyping of new ideas in quantum chemistry, QuAcK provides a flexible environment for testing novel methods before integrating them into larger-scale projects like the [Quantum Package](https://github.com/QuantumPackage/qp2).
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Thanks to its compact and transparent codebase, QuAcK is particularly well-suited for experienced PhD students and postdoctoral researchers who are already familiar with electronic structure theory and want to quickly implement or explore new concepts. Written in a clean and relatively straightforward programming language, it provides an excellent entry point for those looking to dive into method development.
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> ⚠️ **Note:** QuAcK is under active development. Users should be cautious and validate results, as the code may allow unconventional inputs to facilitate flexibility during prototyping.
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For beginners in the field or those with less programming experience, we recommend starting with [qcmath](https://github.com/LCPQ/qcmath/), a symbolic and numerical quantum chemistry toolkit built in [Mathematica](https://www.wolfram.com/mathematica/). qcmath is specifically designed to help newcomers explore and develop ideas without the complexity of full-fledged numerical implementations.
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---
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QuAcK is under active and ongoing development, which means that bugs, inconsistencies, and incomplete features are to be expected. It is a tool made *by* experts *for* experts—users are expected to understand what they’re doing and to remain cautious when interpreting results. The code may allow questionable inputs or behavior *on purpose*, to encourage flexibility during prototyping—so always double-check your results and assumptions.
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## 🚀 Features
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In short: use QuAcK at your own risk—but also to your advantage, if you're ready to experiment and explore.
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- **Rapid Prototyping:** Ideal for testing and developing new quantum chemistry methods.
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- **Modular Design:** Easily integrate with other tools and libraries.
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- **Educational Tool:** Serves as an excellent entry point for researchers familiar with electronic structure theory.
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- **Integration with PySCF:** Utilizes [PySCF](https://github.com/pyscf/pyscf) for computing one- and two-electron integrals.
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# Installation guide
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The QuAcK software can be downloaded on GitHub as a Git repository
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```
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git clone https://github.com/pfloos/QuAcK.git
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---
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## 🛠️ Installation
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1. **Clone the Repository:**
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```bash
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git clone https://github.com/pfloos/QuAcK.git
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```
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2. **Set the `QUACK_ROOT` Environment Variable:**
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```bash
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export QUACK_ROOT=$HOME/Work/QuAcK
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```
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3. **Install PySCF:**
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```bash
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pip install pyscf
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```
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*PySCF is used for computing one- and two-electron integrals, which are then read by QuAcK. It's also possible to use other software for integral computations.*
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---
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## ⚡ Quick Start
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Navigate to the QuAcK directory and run the main script:
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```bash
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cd $QUACK_ROOT
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python PyDuck.py -h
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```
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Then, one must define the variable `QUACK_ROOT`. For example,
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```
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export QUACK_ROOT=$HOME/Work/QuAcK
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```
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You must also install [PySCF](https://pyscf.org) (for example using `pip`)
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```
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pip install pyscf
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**Usage:**
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```bash
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usage: PyDuck.py [-h] -b BASIS [--bohr] [-c CHARGE] [--cartesian]
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[--print_2e] [--formatted_2e] [--mmap_2e] [--aosym_2e]
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[-fc FROZEN_CORE] [-m MULTIPLICITY]
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[--working_dir WORKING_DIR] -x XYZ
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```
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PySCF is used for the computation of one- and two-electron integrals (mainly) which are dumped in files and read by QuAcK.
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Therefore, it is very easy to use other software to compute the integrals or to add other types of integrals.
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**Options:**
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# Quick start
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- `-b, --basis BASIS`: Name of the basis set file in `$QUACK_ROOT/basis/`.
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- `--bohr`: Specify if the XYZ file is in Bohr units (default is Angstrom).
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- `-c, --charge CHARGE`: Total charge of the molecule (e.g., `m1` for -1).
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- `-x, --xyz XYZ`: Path to the XYZ file containing molecular geometry.
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- Additional options available; use `-h` for full list.
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```
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~ 💩 % cd $QUACK_ROOT
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QuAcK 💩 % python PyDuck.py -h
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usage: PyDuck.py [-h] -b BASIS [--bohr] [-c CHARGE] [--cartesian] [--print_2e] [--formatted_2e] [--mmap_2e] [--aosym_2e] [-fc FROZEN_CORE]
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[-m MULTIPLICITY] [--working_dir WORKING_DIR] -x XYZ
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---
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This script is the main script of QuAcK, it is used to run the calculation. If $QUACK_ROOT is not set, $QUACK_ROOT is replaces by the current
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directory.
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## 👥 Contributors
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options:
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-h, --help show this help message and exit
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-b, --basis BASIS Name of the file containing the basis set information in the $QUACK_ROOT/basis/ directory
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--bohr By default QuAcK assumes that the xyz files are in Angstrom. Add this argument if your xyz file is in Bohr.
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-c, --charge CHARGE Total charge of the molecule. Specify negative charges with "m" instead of the minus sign, for example m1 instead of -1.
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Default is 0
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--cartesian Add this option if you want to use cartesian basis functions.
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--print_2e If True, print ERIs to disk.
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--formatted_2e Add this option if you want to print formatted ERIs.
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--mmap_2e If True, avoid using DRAM when generating ERIs.
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--aosym_2e If True, use 8-fold symmetry in ERIs.
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-fc, --frozen_core FROZEN_CORE
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Freeze core orbitals. Default is false
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-m, --multiplicity MULTIPLICITY
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Spin multiplicity. Default is 1 (singlet)
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--working_dir WORKING_DIR
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Set a working directory to run the calculation.
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-x, --xyz XYZ Name of the file containing the nuclear coordinates in xyz format in the $QUACK_ROOT/mol/ directory without the .xyz
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extension
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```
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- [Pierre-François Loos](https://github.com/pfloos)
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- [Anthony Scemama](https://github.com/scemama)
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- [Enzo Monino](https://github.com/enzomonino)
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- [Antoine Marie](https://github.com/antoine-marie)
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- [Abdallah Ammar](https://scholar.google.com)
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- [Mauricio Rodriguez-Mayorga](https://scholar.google.com)
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- [Loris Burth](https://github.com/lorisburth)
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The two most important files are:
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- `$QUACK_ROOT/input/methods` that gathers the methods you want to use.
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- `$QUACK_ROOT/input/options` that gathers the different options associated these methods.
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---
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Copy the files `methods.default` and `options.default` to `methods` and `options`, respectively.
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```
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cp $QUACK_ROOT/input/methods.default $QUACK_ROOT/input/methods
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cp $QUACK_ROOT/input/options.default $QUACK_ROOT/input/options
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```
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You can then edit these files to run the methods you'd like (by replacing `F` with `T`) with specific options.
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These files look like this
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```
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QuAcK 💩 % cat input/methods
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# RHF UHF GHF ROHF HFB
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F F F F F
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# MP2 MP3
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F F
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# CCD pCCD DCD CCSD CCSD(T)
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F F F F F
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# drCCD rCCD crCCD lCCD
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F F F F
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# CIS CIS(D) CID CISD FCI
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F F F F F
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# phRPA phRPAx crRPA ppRPA
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F F F F
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# G0F2 evGF2 qsGF2 ufGF2 G0F3 evGF3
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F F F F F F
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# G0W0 evGW qsGW ufG0W0 ufGW
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F F F F F
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# G0T0pp evGTpp qsGTpp ufG0T0pp
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F F F F
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# G0T0eh evGTeh qsGTeh
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F F F
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# Parquet
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F
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# Rtest Utest Gtest
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F F F
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```
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and
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```
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QuAcK 💩 % cat input/options
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# HF: maxSCF thresh DIIS guess mix shift stab search
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256 0.00001 5 1 0.0 0.0 F F
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# MP: reg
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F
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# CC: maxSCF thresh DIIS
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64 0.00001 5
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# LR: TDA singlet triplet
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F T T
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# GF: maxSCF thresh DIIS lin eta renorm reg
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256 0.00001 5 F 0.0 0 F
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# GW: maxSCF thresh DIIS lin eta TDA_W reg
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256 0.00001 5 F 0.0 F F
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# GT: maxSCF thresh DIIS lin eta TDA_T reg
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256 0.00001 5 F 0.0 F F
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# ACFDT: AC Kx XBS
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F F T
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# BSE: phBSE phBSE2 ppBSE dBSE dTDA
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F F F F T
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# HFB: temperature sigma chem_pot_HF restart_HFB
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0.05 1.00 T F
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# Parquet: TDAeh TDApp max_it_1b conv_1b max_it_2b conv_2b DIIS_1b DIIS_2b lin reg
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T T 10 0.00001 10 0.00001 2 2 T 100.0
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```
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## 📄 License
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For example, if you want to run a calculation on water using the cc-pvdz basis set:
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```
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QuAcK 💩 % python PyDuck.py -x water -b cc-pvdz
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```
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QuAcK is licensed under the [GNU General Public License v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html).
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QuAcK runs calculations in the `QUACK_ROOT` directory which is quite unusual but it also use the `--working_dir` option to run calculations elsewhere.
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---
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<img src="https://lcpq.github.io/PTEROSOR/img/ERC.png" width="200" />
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## 📫 Contact
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QuAcK is supported by the [PTEROSOR](https://lcpq.github.io/PTEROSOR/) project that has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 863481).
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For questions or contributions, please open an issue or submit a pull request on the [GitHub repository](https://github.com/pfloos/QuAcK).
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@ -74,7 +74,7 @@ subroutine RGF2_self_energy(eta,nBas,nC,nO,nV,nR,e,ERI,Ec,SigC,Z)
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Z(:) = 1d0/(1d0 - Z(:))
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! Compute MP2 correlation energy
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! Compute correlation energy
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Ec = 0d0
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