PanQEC is a Python package that simplifies the simulation and visualization of quantum error correction codes. In particular, it provides the following features:
- Simple implementation of topological codes, through lists of coordinates for qubits, stabilizers and logicals. Parity-check matrices and other properties of the code are automatically computed.
- End-to-end sparse implementation of all the vectors and matrices, optimized for fast and memory-efficient simulations.
- Library of high-level functions to evaluate the performance of a code with a given decoder and noise model. In particular, simulating the code and establishing its threshold and subthreshold scaling performance is made particularly easy.
- 2D and 3D visualization of topological codes on the web browser, with a simple process to add your own codes on the visualization. This visualizer can also be found online
- Large collection of codes, error models and decoders.
In its current version, PanQEC implements the following codes
- 2D and 3D surface codes, with periodic/open boundary, on both the rotated and traditional lattices.
- Rhombic code
- Fractons codes: X-Cube model and Haah's code
We also include an option to Hadamard-deform all those codes, i.e. applying a Hadamard gate on all qubits of a given axis. It includes the XZZX version of the 2D and 3D surface codes.
PanQEC also currently offers the following decoders:
- BP-OSD (Belief Propagation with Ordered Statistic Decoding), using the library ldpc developed by Joschka Roffe. Works for all codes.
- MBP (Belief Propagation with Memory effect), as described in this paper. Works for all codes.
- MWPM (Minimum-Weight Perfect Matching decoder) for 2D surface codes, using the library PyMatching developed by Oscar Higgott.
- SweepMatch for 3D surface codes (using our implementation of the sweep decoder for loop-syndrome decoding and PyMatching for point-syndrome decoding).
PanQEC documentation is available at panqec.readthedocs.io.
You can install it using pip install panqec.
To start the GUI, run
panqec start-gui
Then open your browser and go to the link printed out in the command line.
PRs from the community are very welcome! Check out the development section of the documentation for instructions of how to set up the development environment.
An example of a paper which uses PanQEC is here.
PanQEC is currently developed and maintained by Eric Huang and Arthur Pesah. The implementation of 3D toric and fracton codes was done under the supervision of Arpit Dua, Michael Vasmer and Christopher Chubb.
Note: PanQEC was greatly inspired by qecsim at its inception, and we would like to thank its author David Tuckett for providing us with the first seed of this project.