📦 Loom

Loom is a Python library to create and run quantum error correction (QEC) experiments. It provides API that allows users to easily define custom stabilizer codes and corresponding lattice surgery operations. It also provides all tools required to convert any experiments to executables compatible with the most used backend (Stim, QASM, etc...).

Disclaimer: major breaking changes to be expected in the first month from release v0.1.0.

• Website: https://entropicalabs.com/
• API reference: https://loom-api-docs.entropicalabs.com/
• Documentation: https://loom-docs.entropicalabs.com/
• Bug reports: https://github.com/entropicalabs/el-loom/issues
• Support: loom-design-support@entropicalabs.com

Loom is licensed under Apache 2.0.

✨ Features

• ✅ Build QEC experiments with lattice surgery, surface codes and more.
• ⚡ Simulate circuits on multiple backends (Stim, QASM3, etc...)
• 🧠 Analyze stabilizers, syndromes, and logical error rates
• 🧰 Extensible API for custom experiments and backends

📦 Installation

Install the latest release from PyPI:

pip install el-loom

Install the development version directly from GitHub:

pip install git+https://github.com/entropicalabs/el-loom.git

🚀 Quick Start

Here's a simple example of an experiment designed with Eka. Have a look to the documentation for more information on the available features.

from loom.eka import Eka, Lattice
from loom.eka.operations import (
    ResetAllDataQubits, 
    Merge, 
    MeasureBlockSyndromes, 
    MeasureLogicalZ
)
from loom.interpreter import interpret_eka
from loom.executor import EkaToStimConverter
from loom_rotated_surface_code.code_factory import RotatedSurfaceCode

lattice = Lattice.square_2d((15, 15))

# Create rotated surface blocks on a lattice
rsc_block_1 = RotatedSurfaceCode.create(5, 5, lattice, unique_label="rsc_block_1")
rsc_block_2 = RotatedSurfaceCode.create(
    5, 5, lattice, unique_label="rsc_block_2", position=(6, 0)
)

# Define lattice surgery operations to process
operations = [
    ResetAllDataQubits(rsc_block_1.unique_label),
    Merge([rsc_block_1.unique_label, rsc_block_2.unique_label], "rsc_block_3"),
    MeasureBlockSyndromes("rsc_block_3", n_cycles=1),
    MeasureLogicalZ("rsc_block_3"),
]

# Interpret the operations on the rotated surface code blocks
eka_experiment = Eka(
    lattice, blocks=[rsc_block_1, rsc_block_2], operations=operations
)
# This will contain the circuit, syndromes and detectors of the system resulting from the operations.
final_state = interpret_eka(eka_experiment)

# Get the Stim code ready for simulation
stim_circuit = EkaToStimConverter().convert(final_state)

🧑‍💻 Development Setup

To contribute to Loom, set up a development environment using Poetry:

# Clone the repository
git clone https://github.com/entropicalabs/el-loom.git
cd el-loom

# Install Poetry if needed
curl -sSL https://install.python-poetry.org | python3 -

# Install dependencies including dev dependencies
poetry install --with dev

# Get the command to activate the virtual environment
poetry env activate     # or run all commands with "poetry run" prefix

# Run tests
pytest

# Run linting/formatting
poetry run black src tests

🧱 Project Structure

el-loom/
├── .github/workflows/                  # CI/CD workflows
├── docs/                               # Documentation
├── src/
│   ├── checkers/                       # Pylint checkers
│   ├── loom/
│   │   ├── __init__.py
│   │   ├── eka/                        # Error correction algorithms
│   │   ├── executor/                   # Circuit execution and conversion
│   │   ├── interpreter/                # Syndrome interpretation
│   │   └── visualizer/                 # Plotting and visualization
│   ├── loom_five_qubit_perfect_code/
│   │   ├── __init__.py
│   │   ├── selectors.py                    
│   │   ├── applicator/                 # Code-specific interpretation instructions
│   │   └── code_factory/               # Code-specific algorithmic instructions
│   ├── loom_repetition_code/
│   │   └── ...
│   ├── loom_rotated_surface_code/
│   │   └── ...
│   ├── loom_shor_code/
│   │   └── ...
│   └── loom_steane_code/
│       └── ...
├── tests
├── poetry.lock
├── pyproject.toml
└── README.md
 

🪪 License

Loom is licensed under Apache 2.0.

📬 Contact

Created by Entropica Labs. Feel free to open issues, request features, or contribute via pull requests.