奇偶相干态信号场下的量子关联和纠缠-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Generating Quantum Correlation and Entanglement Using Odd and Even Coherent State Signal Fields

Author(s):: LI Min1; LIU Wanfang2; 1.Chengyi College,Jimei University,Xiamen 361021,China;2.School of Mathematics and Physics,Anqing Normal University,Anqing 246133,China

Keywords:: electromagnetically induced optical transparency; odd and even coherent state; quantum correlation; quantum entanglement

摘要:: 为了实现两原子之间的非经典关联，借助于电磁诱导光透明(electromagnetically induced optical transparency, EIT)机制，利用量子态的映射技术，研究原子系综内两原子的量子关联和纠缠。结果表明：分别通过测量扰动刻画的量子关联和并发度刻画的量子纠缠，发现它们都能够被绝热地生成，但是，随着平均光子数的增加，二者的演变完全不同。随着平均光子数的增加，无论信号场是奇数相干态还是偶数相干态，它们都有利于量子关联的生成。对于奇相干态信号场，量子纠缠随着光子数的增加而逐渐减小；对于偶相干态信号场，量子纠缠却经历了一个先增加后减小的过程。系综内原子个数的增加，使得原子间的退相干加剧，从而导致量子关联和纠缠都被削弱。

Abstract:: In order to achieve non-classical correlations between two atoms,the quantum correlation and entanglement between two atoms in an atomic ensemble were studied using the mapping technique of quantum states in the electromagnetic induced transparency(EIT) mechanism.The results show that quantum correlations and entanglements characterized by measurement-induced disturbance (MID) and concurrence can be adiabatic generated, but the evolution of the two is completely different as the average number of photons increases. Whether the signal field is an odd or even coherent state, an increase in the average number of photons is beneficial for the generation of quantum correlations. For the odd coherent state probe field,quantum entanglement gradually decreases with the increase of photon number;For even coherent state probe fields,there is an increasing and then declining process in quantum entanglement. Quantum entanglement and correlation are weakened as the number of atoms in the ensemble increases due to an increase in atom decoherence.