Created almost 4 years ago, updated 4 months ago
ID29256
## https://en.wikipedia.org/wiki/Two-state_quantum_system
## Fermions
- page 9
https://ocw.mit.edu/courses/8-06-quantum-physics-iii-spring-2016/6e02558ecf4b7af37d2cdff550fc0f71_MIT8_06S16_chap4.pdf
