Quantum entropy and special relativity.
We consider a single free spin- 1 / 2 particle. The reduced density matrix for its spin is not covariant under Lorentz transformations. The spin entropy is not a relativistic scalar and has no invariant meaning.
Peres
Asher
A
Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.
Scudo
Petra F
PF
Terno
Daniel R
DR