论文标题
两个耦合双量子点系统中的热纠缠和相关的连贯性
Thermal entanglement and correlated coherence in two coupled double quantum dots systems
论文作者
论文摘要
在这项工作中，我们研究了两个耦合双半导体电荷量子位的热量子相关性。这是通过得出热并发和相关连贯性的分析表达式来进行的。我们详细研究了隧道参数，库仑相互作用和温度对热纠缠以及相关相关性的影响。发现库仑电势在热纠缠和系统的相关性中起着重要作用。结果还表明，库仑电位可用于显着增强热纠缠和量子相干性。一个有趣的方面是，相关的连贯性在低温下捕获了所有热纠缠，即，局部连贯性完全转移到热纠缠中。最后，我们关注热纠缠和负责量子相关的相关连贯性的作用。我们表明，在所有情况下，相关的连贯性都比热纠缠更强大，因此仅基于相关连贯性的量子算法可能比基于纠缠的量子更强大。我们的结果还表明，可以通过改变电子之间的库仑相互作用来调节纠缠。
In this work, we investigate the thermal quantum correlations in two coupled double semiconductor charge qubits. This is carried out by deriving analytical expressions for both the thermal concurrence and the correlated coherence. We study, in detail, the effects of the tunneling parameters, the Coulomb interaction and the temperature on the thermal entanglement and on the correlated coherence. It is found that the Coulomb potential plays an important role in the thermal entanglement and in the correlated coherence of the system. The results also indicate that the Coulomb potential can be used for significant enhancement of the thermal entanglement and quantum coherence. One interesting aspect is that the correlated coherence capture all the thermal entanglement at low temperatures, i.e, the local coherences are totally transferred to the thermal entanglement. Finally, we focus on the role played by thermal entanglement and the correlated coherence responsible for quantum correlations. We show that in all cases, the correlated coherence is more robust than the thermal entanglement so that quantum algorithms based only on correlated coherence may be more robust than those based on entanglement. Our results also show that the entanglement can be tuned by varying the Coulomb interaction between electrons.
