Breakdown of Entanglement During the Teleportation

Abstract：

The teleportation may become an important means for remote distance communications in the future,and the mechanism is based on entanglement of quantum states.but the entanglement is fragile.As the state is disturbed by the environment the entanglement may be broken down.in this work,we choose the electron–positron pair in an entangled state of spin 0 as an example to investigate the rate of breaking down of the entanglement by the Compton scattering with the background radiation photons or Bremstrahlung with strong magnetic fields of some astronomical objects which the electron or positron passes by.Since the spin projection of single electron (positron) is not physically measurable and the electron beams cannot keep its shape for long because of the coulomb repulsion among the charged particles in the beam,the only way is to shoot one electron–positron pair each time and continuously repeat the processes.With all the restraints this study has only pedagogic meaning, but may shed light on further studies where other information messagers are chosen.