CtrlQ

CtrlQ is an open-source tool designed to simulate a gate-free state preparation on a Transmon qubit device using analog control pulses. The analog control pulses can be variationally shaped to drive an initial state to a target state in the framework of ctrl-VQE. In molecular systems, ctrl-VQE can be used to drive the initial Hartree Fock state to the full configuration interaction (FCI) state with substantial pulse duration speedups as compared to a gate-based compilation.

The control quantum program (CtrlQ) is written in python with bindings to C++ codes for highly efficient time-evolution of quantum systems either using an ordinary-differential-equation or the Suzuki-Trotter expansion. Efficient analytic gradients for pulse parameters is implemented which allows optimization of thousands of pulse parameters with only about 2.5 times the cost of an energy evaluation.

Reference OR Meitei, BT Gard, GS Barron, DP Pappas, SE Economou, E Barnes, NJ Mayhall, Gate-free state preparation for fast variational quantum eigensolver simulations: ctrl-VQE arXiv:2008.04302

Installation

Detailed information for installation is provided in the documentation and consist of the following simple steps to build CtrlQ

1. Get the source code from github:

   git clone --recursive https://github.com/oimeitei/ctrlq.git
   

2. Configure with cmake and compile

   cd ctrl
   mkdir build && cd build
   cmake ..
   make
   

3. Run test

   python -m unittest discover
   

Documentation

Documentation is available online in html format here and also can be found in the /ctrlq/doc directory. The documentation contains detailed installation instruction including linking to optimized MKL libraries and tutorials to run CtrlQ.