First slides for a grandmother's explanation of Quantum Physics.

1. You do not really understand something unless you can explain it to your grandmother.
~ quote attributed to Albert Einstein
Quantum Physics
as I would explain it to my grandmother

2. ...it isn’t as horrible as it looks.
~ Richard Feynman
All elementary particles are arrows (1st principle)
Arrows may:
- rotate about their center (2nd principle)
- travel through space (3rd principle)
- interact with each other (4th principle)

3. All we do is draw little arrows on a piece of paper – that's all.
arrow 1 ~ Richard Feynman
All elementary particles are arrows (1st principle)
arrow 2
for grandma for insiders
ψ1
arrow addition
arrow 1 + arrow 2 |ψ+> = |ψ1> + |ψ2> =
( )ψ2
kets
state vectors
vector space
ψ1
arrow subtraction
arrow 1 - arrow 2
|ψ−> = |ψ1> − |ψ2> = ( )−ψ2 Hilbert space
arrow multiplication: half times arrow 1 |ψ0.5> = 0.5|ψ1>
enlarge or shorten
complex numbers
and half times arrow 1
times angle 50° |ψ50°> = 0.5 exp (2πi.50/360) |ψ1>
rotate

4. Elementary particles are extremely boring
~ Steven Weinberg
Arrows may rotate about their center (2nd principle)
possibilities for
rotation
for grandma for insiders
polarization
the velocity at the tips of the Schrödinger
arrow is perpendicular to the
i d|ψ>/dt = ω |ψ> equation
arrow itself
2D
Axis keeps same
direction
3D
spin
Axis also spins
about another axis

5. All we do is draw little arrows on a piece of paper – that's all.
~ Richard Feynman
Arrows may travel through space (3rd principle)
for grandma for insiders

6. All we do is draw little arrows on a piece of paper – that's all.
~ Richard Feynman
Arrows may interact with each other (4th principle)

7. Dedicated to my grandmothers
Elisabeth Margaretha Dijksman van den Broeck Maria Magdalena de Boer van der Linden
15 August 1910 - 3 January 2006 16 March 1912 - 5 November 2000
You do not really understand something unless you can explain it to your grandmother.
~ quote attributed to Albert Einstein