Entangled
Quantum States
John
Bell brilliant theoretical physicist
He didn’t
like quantum mechanics (thought it was rotten)
John
wheeler thought that it was beautiful
Feynman:
Quantum Mechanics deals with amplitudes for initial to final state
What's
the amplitude for us to go from one to the other and specify the final state
Bohr: different experimental arrangements are part
of the specification of the quantum mechanical process
Decoherence- as soon
as you a macroscopic system with quantum mech. System, the state is much more
complicated
EPR
paradox- some system with angular momentum that can decay into an electron and
a positron
Thought
that quantum mechanics was incomplete
If we can
determine a value of a property of that system then that was an element of
reality
If
electron is spin up, then positron is spin down
Sz is real
Sx is real
Spooky
action at a distance, reality
Depends
on what the other experimenter does
Bell
shows that it doesn’t work with inequalities that any hidden variable theory
would have to obey