LibForQ: A Fortran Library for Quantum Information Science
In this library we will continuously add and improve Fortran code to perform several numerical tasks one frequently needs when working in quantum information science. Among the functionalities already implemented, some examples are:
- Generators for random numbers, probability vectors, unitary matrices, state vectors, and density matrices;
- Trace, partial trace, and partial transpose;
- Entanglement, discord, and coherence quantifiers;
- Pauli group (PG), Generalized Gell Mann Matrices (GGMM), and Bloch vector and correlation matrix with GGMM;
- Some other matrix functions are also included, some examples are:
Norms, inner products, and distance and distinguishability measures; Purity, entropies, information measures, and mutual information; Some popular, and not so popular, quantum states; Array display, Ginibre and identity matrices, adjoint, Kronecker product (KP), KP of n elements of the PG, Gram-Schmidt orthogonalization, projector, outer product, random permutation for a vector components, etc. I think it is better to take a look at the code and see all functions included. The variables used and needed are explained there.
One can use this library simply by copying all the files to the main program folder and compiling them with: gfortran -lblas -llapack *.f90 To run the executable file a.out generated just use: ./a.out
Another, perhaps more convenient, manner of using the code is by creating a library. For that purpose you may follow the simple steps below:
- Extract compressed file
- Go to the associated folder
- Create a library with the commands: gfortran -O3 -c rng_mt.f90 gfortran -O3 -c *.f90 and ar cr libforq.a *.o *.mod To compile your main program using this library, copy libforq.a to your program's folder and use the command: gfortran -lblas -llapack libforq.a main.f90 Even better, you can also copy the library to your computer's libraries folder, e.g. with: sudo cp libforq.a /usr/local/lib and use it, anywhere in your computer, via gfortran -lblas -llapack -lforq main.f90