利用多光子相互作用实现量子信息传递

利用全量子理论,研究了多原子-腔场系统中多光子相互作用的过程,给出了不同情况下系统的一般演化式,发现利用此过程可实现量子纠缠信息的传递:只要控制腔场与原子相互作用的时间即原子以特定速度通过腔场时,处于基态的原子与存储纠缠信息的腔场相互作用的结果使原子获得量子纠缠信息;相反,纠缠原子中的量子纠缠信息也可传递给处于真空态的腔场;基态原子作为"飞行的量子比特"还可将量子纠缠信息从一个腔场传递到另一个腔场。该结论适应于讨论任意多个原子-腔场系统中任意多个光子相互作用的普遍情形。

Quantum Information Transfer Via Multi-Photon Interaction

According to the complete quantum theory,the process of multi-photon interaction in the multi-atom-cavity system was studied.The universal evolution equations of the system were shown under different states.It is found that the quantum entanglement information can be transferred by using the interaction process.When the time of atoms interacting with cavities is controlled,namely,the atoms pass the cavity field with special speeds,the quantum entanglement information can be obtained via ground state atoms interacting with the cavity field carrying entanglement information,whereas the quantum entanglement information stored in the atoms can also be transferred to the cavity field of vacuum state.And the ground atoms as "flying qubit" can transmit the quantum entanglement information from a cavity field to another.The conclusions mentioned above are fit for the interaction among photons.