STEM · Full roadmap · ~90 min read · 28 steps
⚛️Quantum physics without the mysticism
Understand what quantum physics really says and what it does not
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Unit 1
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Course overview
What "quantum" actually means
Quantized means discrete, not continuous
The crack in classical physics: glowing hot objects
Blackbody radiation and the ultraviolet catastrophe
Planck's desperate fix
Energy comes in packets, E = hf
Einstein takes the packets seriously
The photoelectric effect and photons
Unit 2
So is light a wave or a particle?
Wave-particle duality
The double-slit experiment
Interference from two paths
What watching the slits does
Which-path measurement destroys interference
Matter is wavy too: de Broglie
The de Broglie wavelength
The wavefunction
A wave of probability amplitude
Unit 3
Superposition, carefully
A sum of possibilities, not two realities
The uncertainty principle
Position and momentum cannot both be sharp
Why atoms do not collapse: energy levels
Quantized energy and the Bohr model
The limits of the Bohr model: orbitals
Electrons live in probability clouds
Spin
An intrinsic quantum property
Unit 4
Why chemistry works: the Pauli exclusion principle
No two electrons share the same state
Quantum tunneling
Passing through walls that should stop you
Entanglement, honestly
Correlated outcomes from a shared state
Why entanglement does not send signals
No faster-than-light communication
Bell's theorem: ruling out the obvious explanation
The correlations are not from hidden instructions
Unit 5
The measurement problem
The gap between smooth evolution and definite outcomes
Interpretations are stories, not separate physics
Same predictions, different pictures
Decoherence: why the quantum world looks classical
Entanglement with the environment hides interference
Quantum technology you already use
Transistors, lasers, and MRI
Qubits and quantum computing
Using superposition and entanglement to compute
Unit 6
Common myths to retire
The errors people repeat most
Putting it together and how to keep learning
A practice routine for thinking quantum
Where to go next
Where to go next