Quantum Mechanics Ex: Free particle in Heisenberg表象 2 =0,p is conservative p(t)=p(o)=p iHi O),H=e h 21 2021/2/242021/2/24 7 Quantum Mechanics m p H 2 ˆ ˆ 2 = ․ Ex: Free particle in Heisenberg表象   0 ˆ  pˆ, H = , p ˆ is conservative , p ˆ(t) = p ˆ(0) = p ˆ   m p e m p e e m p e r i r t H i r t dt d iHt iHt iHt iHt ˆ ˆ 2 ˆ ˆ, 1 ˆ ˆ( ), 1 ˆ( ) ˆ ˆ ˆ 2 ˆ = =       = = − −      