论文标题
通过具有不同能量差异的非相同探测器收集纠缠
Harvesting Entanglement by non-identical detectors with different energy gaps
论文作者
论文摘要
已经表明，自由量子场的真空状态是纠缠的，可以通过一对最初与真空场相互作用的最初不相关的检测器在有限的时间内收集真空纠缠。在本文中，我们通过高斯开关函数研究了两个非相同惯性检测器的纠缠收集现象，这些惯性探测器具有不同的能量隙与无质量标量场相互作用。我们关注纠缠收集如何从两个角度来取决于能量差距的差异：收获的纠缠量和两个检测器之间的收获可调节分离。从纠缠量的意义上，我们发现，只要相对于相互作用持续时间参数的探测器间的分离不太小，两个非相同检测器就可以从真空状态中提取更多的纠缠，而不是相同的检测器。当探测器间的分离足够大时，能量差距差的最佳值将使收获的纠缠到峰值。关于可获得的分离，我们进一步发现，能量差异差异通常会扩大可获得的分离范围。我们的结果表明，与相同的探测器相比，在某些情况下，非相同的探测器可能有利于从真空中提取纠缠。
It has been shown that the vacuum state of a free quantum field is entangled and such vacuum entanglement can be harvested by a pair of initially uncorrelated detectors interacting locally with the vacuum field for a finite time. In this paper, we examine the entanglement harvesting phenomenon of two non-identical inertial detectors with different energy gaps locally interacting with massless scalar fields via a Gaussian switching function. We focus on how entanglement harvesting depends on the energy gap difference from two perspectives: the amount of entanglement harvested and the harvesting-achievable separation between the two detectors. In the sense of the amount of entanglement, we find that as long as the inter-detector separation is not too small with respect to the interaction duration parameter, two non-identical detectors could extract more entanglement from the vacuum state than the identical detectors. There exists an optimal value of the energy gap difference when the inter-detector separation is sufficiently large that renders the harvested entanglement to peak. Regarding the harvesting-achievable separation, we further find that the presence of an energy gap difference generally enlarges the harvesting-achievable separation range. Our results suggest that the non-identical detectors may be advantageous to extracting entanglement from vacuum in certain circumstances as compared to identical detectors.
