# Quantum

> Quantum physics fundamentals

- Skill: `ffsshhttiikk/quantum` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ffsshhttiikk/quantum`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ffsshhttiikk/quantum/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: ffsshhttiikk (https://skillmd.com/u/ffsshhttiikk)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ffsshhttiikk/quantum

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## What I do
- Apply wave-particle duality concepts
- Analyze quantum state evolution
- Model quantum entanglement and Bell inequalities
- Calculate transition probabilities
- Study quantum measurement and wave function collapse
- Apply selection rules for allowed transitions

## When to use me
When studying quantum information, quantum computing, or fundamental quantum physics.

## Key Concepts
- **de Broglie Wavelength**: λ = h/p relates momentum to wave nature
- **Born Rule**: Measurement yields eigenvalues with probabilities |⟨a|ψ⟩|²
- **Entanglement**: Non-classical correlations between quantum particles
- **Heisenberg Picture**: Operators evolve, states fixed; vs Schrödinger picture
- **Commutators**: [A, B] = AB - BA, [x, p] = iℏ
- **Density Matrix**: ρ = |ψ⟩⟨ψ| for pure states, Tr(ρ²) < 1 for mixed