Published on Zenodo + Renamed to QRL

Two major updates: The project is now officially published on Zenodo with DOI 10.5281/zenodo.18292199, and we’ve renamed from QPL to QRL (Quantum Relational Language) to avoid confusion with existing academic work.
quantum computing
QRL
publishing
open science
Zenodo
Author

David Coldeira

Published

January 18, 2026

Quantum Relational Language (QRL) Repository

QRL is now citable! Use the Zenodo DOI in your research:

DOI: 10.5281/zenodo.18292199

GitHub: dcoldeira/quantum-relational-language

Status: ✅ Published | ✅ Teleportation working | ✅ 47 tests passing

Two Big Updates

This week brought two important changes to the project:

  1. Published on Zenodo - Now citable with a permanent DOI
  2. Renamed to QRL - From “QPL” to “Quantum Relational Language”

Let me explain both.

Published on Zenodo

What is Zenodo?

Zenodo is an open-access repository operated by CERN for research outputs. It provides permanent, citable references (DOIs) for software, datasets, and preprints.

Why publish now?

Stage 3 just completed. QRL now has:

  • Complete MBQC compiler (graph extraction + pattern generation)
  • Adaptive Pauli corrections
  • Quantum teleportation with fidelity = 1.0
  • 47 passing tests

This is working, tested code. Time to make it officially citable.

What the DOI gives us:

  • Permanent reference - The code snapshot is archived forever
  • Citable in papers - Others can reference this work properly
  • Timestamp priority - Establishes when this work was done
  • Professional credibility - More than “just a GitHub repo”

How to cite QRL:

@software{coldeira2026qrl,
  author       = {Coldeira, David},
  title        = {{Quantum Relational Language (QRL): A 
                   relations-first compiler for measurement-based 
                   quantum computing}},
  year         = 2026,
  publisher    = {Zenodo},
  version      = {v0.3.0},
  doi          = {10.5281/zenodo.18292199},
  url          = {https://doi.org/10.5281/zenodo.18292199}
}

Renamed: QPL → QRL

The Problem:

“QPL” is already taken. In 2004, Peter Selinger published “Towards a quantum programming language”, describing a quantum programming language called QPL. It’s well-established in academic literature with many citations.

Continuing to call this project “QPL” would create confusion and look like I’m unaware of existing work in the field.

The Solution:

Rename to QRL (Quantum Relational Language).

This name: - ✅ Accurately describes the approach (relations-first) - ✅ Avoids conflict with Selinger’s QPL - ✅ Is memorable and searchable - ✅ Aligns with the core philosophy (quantum relations as primitives)

What Changed:

  • Package name: src/qpl/ → src/qrl/
  • Main class: QPLProgram → QRLProgram
  • Repository URL: Same (quantum-relational-language)
  • All imports and tests updated
  • Version bumped: 0.1.0 → 0.2.0

What Didn’t Change:

  • The language design
  • The implementation
  • The API structure
  • The MBQC compiler
  • Test suite (all 47 still passing)

This is purely a naming change for academic clarity.

Installation

git clone https://github.com/dcoldeira/quantum-relational-language.git
cd quantum-relational-language
pip install -e .

Updated import:

from qrl import QRLProgram  # Was: from qpl import QPLProgram
from qrl.mbqc import extract_graph, generate_pattern_from_relation

Quick Example

from qrl import QRLProgram
from qrl.mbqc import simulate_teleportation, verify_teleportation_fidelity
import numpy as np

# Create arbitrary input state
input_state = np.array([0.6, 0.8])

# Teleport it
output_state, outcomes, corrections = simulate_teleportation(input_state)

# Verify fidelity
fidelity = verify_teleportation_fidelity(input_state, output_state)
print(f"Fidelity: {fidelity}")  # 1.0

What’s Next

Stage 4: Photonic Integration

  • Connect QRL to graphix (MBQC framework)
  • Test with Perceval simulator
  • Target real photonic hardware (Quandela)

Formal Publication

  • Write LaTeX preprint documenting the approach
  • Submit to QPL Workshop 2026 (if CFP opens)
  • Aim for IEEE QCE 2026/2027

Summary

Published: Zenodo DOI 10.5281/zenodo.18292199 (January 18, 2026)

Renamed: QPL → QRL (Quantum Relational Language) to avoid conflict with Selinger’s QPL (2004)

Status: Stage 0-3 complete, 47 tests passing, teleportation fidelity = 1.0

Next: Photonic integration and formal publication

The project is now properly named, properly archived, and ready for the next phase.

Questions or feedback? Open an issue on GitHub.