论文标题
单个电子在双量子点中与Rashba相互作用的热纠缠和量子相干性
Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction
论文作者
论文摘要
在这项工作中，我们研究了半导体双量子点中的热量子相干性和保真度。该设备由一个双量子点中的单个电子组成，在存在外部磁场的情况下与Rashba自旋轨道耦合。在我们的情况下，单电子的热纠缠由电荷和自旋量子台驱动，后者由Rashba耦合控制。使用密度矩阵形式主义获得了热并发和相关相关性的分析表达式。这项工作的主要目的是对温度和量子相干的几个参数的影响有很好的了解。此外，我们的发现表明，我们可以使用Rashba耦合来调整系统的热纠缠，量子相干性以及系统的热忠诚行为。此外，我们专注于热纠缠和负责量子相关的相关连贯性所起的作用。我们观察到，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。
In this work, we study the thermal quantum coherence and fidelity in a semiconductor double quantum dot. The device consists of a single electron in a double quantum dot with Rashba spin-orbit coupling in the presence of an external magnetic field. In our scenario, the thermal entanglement of the single electron is driven by the charge and spin qubits, the latter controlled by Rashba coupling. Analytical expressions are obtained for thermal concurrence and correlated coherence using the density matrix formalism. The main goal of this work is to provide a good understanding of the effects of temperature and several parameters in quantum coherence. In addition, our findings show that we can use the Rashba coupling to tune in the thermal entanglement, quantum coherence, as well as, the thermal fidelity behavior of the system. Moreover, we focus on the role played by thermal entanglement and correlated coherence responsible for quantum correlations. We observe that the correlated coherence is more robust than the thermal entanglement in all cases, so quantum algorithms based only on correlated coherence may be stronger than those based on entanglement.
