The Quantum Well is a physics student's digital notebook collection built in Obsidian. The author shares their graduate-level notes on quantum mechanics, mathematical physics, and related topics. It's organized like a personal Zettelkasten, with atomic notes connected through tags and indices. If you're studying advanced physics or math, it's cool to see how someone else organizes and connects these complex concepts. The whole thing is a work in progress, with around 1,000 notes that keep growing.