论文标题
三个Unruh-Dewitt探测器的纠缠收获
Entanglement harvesting of three Unruh-DeWitt detectors
论文作者
论文摘要
我们使用三个Unruh-Dewitt检测器绝热与量子标量场相互作用，分析了三方纠缠收集方案。我们认为检测器的线性，等边三角形和斜角三角形构型。我们发现，在相同的参数下，可以在线性构型中提取更多的纠缠，而与等边相比，与单个瞬时切换结果一致。收获三方纠缠不需要两分纠缠。此外，我们发现，即使一个检测器与其他两个探测器相比，三方纠缠也可以收获，即我们还发现，对于小探测器分离，两分性相关性比三方的相关性大，从而显然违反了科夫曼·昆杜（CKW）的不平等。我们表明，这不是我们扰动扩张的结果，而是因为收获量子位处于混合状态而发生。
We analyze a tripartite entanglement harvesting protocol with three Unruh-DeWitt detectors adiabatically interacting with a quantum scalar field. We consider linear, equilateral triangular, and scalene triangular configurations for the detectors. We find that, under the same parameters, more entanglement can be extracted in the linear configuration than the equilateral one, consistent with single instantaneous switching results. No bipartite entanglement is required to harvest tripartite entanglement. Furthermore, we find that tripartite entanglement can be harvested even if one detector is at larger spacelike separations from the other two than in the corresponding bipartite case. We also find that for small detector separations bipartite correlations become larger than tripartite ones, leading to an apparent violation of the Coffman-Kundu-Wootters (CKW) inequality. We show that this is not a consequence of our perturbative expansion but that it instead occurs because the harvesting qubits are in a mixed state.
