多原子-腔系统中的量子信息传递

提出了一个多原子-腔组成的物理系统,并讨论了发生在该系统中量子信息的交换和传递过程,结果发现:由最低两个Fock态｜０〉和｜1〉任意组成的光量子态腔场,当处于基态的原子以特定的速度通过腔时,原子都能带走腔中的量子态并据为己有;反之,由两能级原子的基态｜g〉和激发态｜e〉任意组成的量子态,当原子以特定的速度通过处于真空态的腔时,原子都能把携带的量子态释放于腔中,实现了腔-原子之间的信息交换.利用原子能够捡起、释放量子信息这一特点,进一步讨论了把原子作为运输工具实现腔-腔之间异地量子信息传递的物理过程.

Quantum Information Transfer Among the System of Many Atoms and Cavities

A Multi-cavity-atom physical model was proposed and the physical processes of quantum information transfer which happen to the system was discussed. It is found that atoms can pick up the quantum state and carry it out of the cavities in which there is a quantum state that consists of the lowest two Fock states ｜０〉 and ｜1〉 arbitrarily when the atoms, which all are initially in ground states, cross the cavities with a controlled speed. On the other hand the atoms can release the quantum state into the cavities when the atoms are in the state that consists of the ground states ｜g〉 and excited ｜e〉 arbitrarily and after the atoms cross the cavities. By this means one can realize the information exchange between cavities and atoms. We also discussed the information transfer between two sets of cavities through the atomic macroscopic motion via the twice passage of the cavities.