User:Yearsley

Quantum, or Probability Backflow is a phenomena in Quantum Mechanics wherein a wavepacket composed of states of positive momentum my nevertheless have negative current density over a region of space. This phenomena is a result of interference effects in quantum mechanics, and is clearly imposible in classical physics.

Description
Suppose we have a momentum space wavefunction \psi<\math> such that \psi(k)=0 for