6: Quantum Statistical Mechanics

Question 1

___ state described by a single wavefunction

Answer 1

pure

Question 2

___ state subsystems can be in different ststes

Answer 2

mixed

Question 3

trace is ___ under unitary transformations

Answer 3

invariant

Question 4

members of ensemble don’t interact, wavefunctions ___

Answer 4

don’t interfere

Question 5

entropy of a closed system is maximal when system is ___

Answer 5

in equilibrium