【摘要】 将来的远程通信中 ,量子远程传输可能成为重要的手段之一 .整个理论是基于量子纠缠态机制的 .但是纠缠态是很脆弱的 .当量子态被环境扰动时 ,纠缠态会被打破 .在此文中 ,我们选择处在总自旋为 0的纠缠态中的正负电子为例 ,研究纠缠态由于与背景辐射光子的康普顿散射或与电子经过的大天体的强磁场散射而破坏的概率 .由于单个电子的自旋投影不是物理可观测量 ,而且 ,电子束由于带电粒子间的库仑斥力 ,不可能较长期保持成团的形状 .因而只能每次只发射一对正负电子对 ,并不断重复这个过程 .由于这些限制 ,此文研究只有理论上的意义 ,但是也许对将来如何选择信息传递信使的研究有帮助更多还原

【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.更多还原