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arXiv 2007.05863quant-phcond-mat.mes-hall
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两个耦合双量子点系统中的热纠缠与关联相干性

Thermal entanglement and correlated coherence in two coupled double quantum dots systems

Cleverson Filgueiras, Onofre Rojas, Moises Rojas

AI总结:

本研究推导了耦合双半导体电荷量子比特系统的热并发度与关联相干性解析表达式,分析了多参数对热量子关联的影响,发现库仑势可增强热纠缠与相干性,且关联相干性比热纠缠更鲁棒,可通过库仑相互作用调控纠缠。

摘要:

在这项工作中,我们研究了两个耦合的双半导体电荷量子比特中的热量子关联。我们通过推导热并发度(thermal concurrence)和关联相干性(correlated coherence)的解析表达式来开展研究。我们详细分析了隧穿参数、库仑相互作用以及温度对热纠缠和关联相干性的影响。研究发现,库仑势在系统的热纠缠和关联相干性中发挥着重要作用。结果还表明,库仑势可用于显著增强热纠缠和量子相干性。一个有趣的现象是,在低温下关联相干性涵盖了全部的热纠缠,也就是说,局域相干性会完全转移为热纠缠。最后,我们重点探讨了热纠缠和关联相干性在量子关联中的作用。我们发现,在所有情况下,关联相干性都比热纠缠更具鲁棒性,因此仅基于关联相干性的量子算法可能比基于纠缠的算法更稳定。我们的研究结果还表明,可以通过改变电子之间的库仑相互作用来调控纠缠。

英文摘要:

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.

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