Quantum-discord-triggered superradiance and subradiance in a system of two separated atoms

Quantum-discord-triggered superradiance and subradiance in a system of two separated atoms
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两个分离原子系统中量子不和谐触发的超辐射度和亚辐射度

DOI:
10.1007/s11128-015-1026-9
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发表时间:
2015-08
影响因子:
2.5
通讯作者:
X. W. Wang
X. W. Wang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
S. Q. Tang;J. B. Yuan;L. M. Kuang;X. W. Wang

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研究了X型量子态中两个分离原子的集体辐射性质。我们发现,即使在没有原子间量子纠缠的情况下,由量子不和谐(QD)测量的量子关联也可以触发和增强两原子系统中的超辐射和亚辐射。我们还探讨了光子的量子统计性质的超辐射和亚辐射通过解决二阶相关函数。特别地,当两个分离原子的初始态为量子点非零的Werner态时,我们发现超辐射区的辐射光子呈现非经典的亚泊松统计,且亚泊松统计的程度随着量子点数量的增加而增加,而次辐射区的辐射光子具有亚泊松或超泊松分布,泊松统计依赖于QD的量和方向角。在亚辐射区,我们预测了量子点引发的光子统计从超泊松到亚泊松的跃迁。这些结果为量子点作为量子资源的应用提供了新的思路。
We investigate collective radiant properties of two separated atoms in X-type quantum states. We show that quantum correlations measured by quantum discord (QD) can trigger and enhance superradiance and subradiance in the two-atom system even though in the absence of interatomic quantum entanglement. We also explore quantum statistical properties of photons in the superradiance and subradiance by addressing the second-order correlation function. In particular, when the initial state of the two separated atoms is the Werner state with nonzero QD, we find that radiation photons in the superradiant region exhibit the nonclassical sub-Poissonian statistics and the degree of the sub-Poissonian statistics increases with increasing of the QD amount, while radiation photons in the subradiant region have either the sub-Poissonian or super-Poissonian statistics depending on the amount of QD and the directional angle. In the subradiant regime, we predict the QD-triggered photon statistics transition from the super-Poissonian to sub-Poissonian statistics. These results shed a new light on applications of QD as a quantum resource.
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