Quantum physics
Wavefunctions, operators, and the etiquette of Dirac notation.
the shape of this subject
Quantum is unforgiving to students who skip the setup. Brainback insists you write the Hamiltonian before you diagonalize it.
Because quantum physics rewards the students who do the reps — and punishes the ones who outsource them.
- discipline
- STEM
- parent subject
- Physics
- typical weekly load
- 3-6 problem sets · 3-5 hours · 1-2 recall sessions
- covered on plan
- all plans (free forever)
Every quantum physics concept Brainback covers.
Add Quantum physics as a Learn subject and every problem in these areas routes to the Socratic tutor — attempt-first, hint-laddered, output-guarded.
What one turn in quantum physics actually looks like.
Attempt → correction → guiding question. No answer. Ever. Verbatim from a beta session.
⟨ψ|H|ψ⟩ = ⟨ψ|E|ψ⟩ = E since ψ is normalized…
Is the operator Hermitian? What does that guarantee about the eigenvalues?
no answer · one guiding question · your next move
How real attempts start. How Brainback nudges.
- ⟨ψ|H|ψ⟩ = ⟨ψ|E|ψ⟩ = E since ψ is normalized…
- Is the operator Hermitian? What does that guarantee about the eigenvalues?
the anti-pattern
What quantum physics looks like when the AI does the thinking.
Answer machines make quantum physics look like a solved problem. It isn't. The exam room reveals whose reasoning was built and whose was rented.
- M1Applying a formula without checking whether the conditions actually hold.
- M2Skipping the sanity check — 'does the sign / magnitude make sense?'
- M3Memorizing steps instead of reasoning about why they're legal.
- M4Reading past the setup and diving straight into computation.
the recall card
What a spaced-repetition card looks like in quantum physics.
Every wrong attempt and low-scored explain-back becomes a card. SM-2 schedules them — the tricky ones come back tomorrow, the solid ones drift out to next week, then next month.
Recall the core concept in your own words. Then apply it to a fresh example under 2 minutes.
Related subjects.
The subject where the shortcut has always been most expensive.
Limits, rates, and shapes of change — earned, not delivered.
Where symbolic manipulation becomes second nature — or doesn't.
See the diagram. Not just look at it.
Unit circle, but also unit intuition.
Vectors are directions, not numbers.
quantum physics — ready when you are
Start your first quantum physics session.
Attempt-first. Never the answer. Add it as a Learn subject in 30 seconds.