Entangled Code

Rigorous Quantum Computing • Physics-Informed Software Engineering

Expert-level quantum computing insights by David Coldeira. Rigorous physics, production-quality code, and deep technical analysis of quantum mechanics, QPL (Quantum Process Language), entanglement, and building real quantum computing tools.

Where Quantum Mechanics Meets Production Code

Building quantum computing tools and scientific software with honest evaluation, rigorous physics, and production-quality engineering.

🔬 Featured Project: Quantum Process Language (QPL)

Relations-first quantum programming where entanglement is a first-class citizen.

Not another gate-based framework—this is quantum computing built from first principles.

What You’ll Find Here:

  • 🔬 Deep Technical Analysis - Expert-level quantum computing insights, not tutorials
  • ⚛️ Honest Quantum Evaluation - Critical assessment of quantum claims and real-world viability
  • 🎯 Physics-Informed Design - How domain knowledge shapes software architecture
  • 🛠️ Production Experience - Lessons from building real quantum computing tools

Latest Posts

QPL Meets Photonics: The First Relations-Based Compiler for Photonic Quantum Computers

quantum computing
QPL
photonic QC
MBQC
Quandela
Perceval
graphix
hardware
Photonic quantum computers are MBQC-native. QPL’s relations-first approach compiles directly to photonic circuits, bypassing gate decomposition entirely. This changes everything.
Jan 15, 2026
15 min

Stage 2 Complete: QPL Now Compiles to MBQC Patterns

quantum computing
QPL
MBQC
quantum teleportation
compiler
measurement patterns
The MBQC compiler is working! QPL now extracts graph states, generates measurement patterns, and performs quantum teleportation with adaptive corrections. Here’s what changed and why it matters.
Jan 12, 2026
10 min

Why QPL is Adopting Measurement-Based Quantum Computing

quantum computing
QPL
MBQC
research
quantum foundations
Gates are not how quantum mechanics works. QPL is adopting Measurement-Based Quantum Computing (MBQC) as its compilation target—not because it’s easier, but because it’s what the physics actually says. Here’s the theory, the motivation, and the research program ahead.
Jan 2, 2026
14 min

Stage 1: Scaling Relations-First Quantum Programming to n Qubits

quantum computing
QPL
physics
GHZ states
entanglement
tensor networks
Stage Zero proved relations-first quantum programming works for 2 qubits. Stage 1 scales to arbitrary n-qubit systems with GHZ states, W states, and proper tensor algebra. Here’s what changed and why it matters.
Dec 31, 2025
19 min

Stage Zero: Programming Quantum Reality Through Relations, Not Gates

quantum computing
QPL
physics
programming languages
research
Most quantum frameworks force you to think in gates. QPL Stage Zero proves you can build from entanglement instead. Here’s why relations-first quantum programming might unlock something bigger.
Dec 29, 2025
13 min

Quantum Computing Foundations: The Theory Behind QPL

quantum computing
theory
physics
tutorial
A comprehensive guide to the quantum mechanics you need to understand relations-first quantum programming. From superposition to entanglement entropy.
Dec 13, 2025
9 min
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