基于两个Λ型三能级原子实现量子交换门

Implementation of Quantum Swap Gate Based on TwoΛ-type Three-level Atoms

利用Λ型三能级原子与双模腔场的耦合和经典光场的驱动,提出在两原子间实现量子交换门的理论方案.此方案中,量子信息仅编码于原子基态上,因而其不受原子自发辐射影响.考虑在腔耗散后,通过选择合适参数,数值模拟结果表明该交换门的保真度可超过0.949.

A theoretical scheme is presented to realize a quantum swap gate between twoΛ-type three-level atoms,which are coupled with a double-mode cavity and driven by classical field.In this scheme,the quantum information is encoded on the two ground states of atoms,so it is robust against spontaneous emission of atoms.After considering the cavity decay,the simulation results show that the fidelity of the swap gate can reach 0.949 by selecting appropriate parameters.