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arXiv 2108.01205quant-ph
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正则和Majorana费米子系统中量子资源的动力学

Dynamics of quantum resources in regular and Majorana fermion systems

Diego Paiva Pires, Diogo O. Soares-Pinto, E. Vernek

摘要:

近年来,资源理论框架下对量子物理现象的重新评估引发了利用量子资源的新型量子技术的设计,如纠缠和量子相干性。考虑到这一点,在这项工作中,我们研究了两个固态费米子量子器件的量子资源的动力学:(i)由一对马约拉纳费米子组成的系统和(ii)另一个包括一对常规费米子。在这两个系统中,费米子物质都耦合到一个单能级量子点。从这些三方系统与耗散水库的相互作用,我们能够表征的动态设备的一些初始状态。通过采用时间非定域主方程方法,我们得到了费米子占据、量子关联和量子相干性在马尔可夫和非马尔可夫耗散体系中的演化。我们调查的相互转换的本地相干性和二分相关的边缘状态在每个设备。虽然动力学的纠缠和量子相干性依赖于相当强烈的温度的水库定期费米子,我们发现这些演变是定性相似的情况下,马约拉纳束缚态的温度无关。我们的结果说明了使用量子信息理论的措施来表征量子资源在费米子系统中的作用。

英文摘要:

In recent years, the reassessment of quantum physical phenomena under the framework of resource theories has triggered the design of novel quantum technologies that take advantage from quantum resources, such as entanglement and quantum coherence. Bearing this in mind, in this work we study the dynamics of quantum resources for two solid-state fermionic quantum devices: (i) a system composed by a pair of Majorana fermions and (ii) another comprising a pair of regular fermions. In both systems, the fermionic species are coupled to a single-level quantum dot. From the interaction of these tripartite systems with a dissipative reservoir, we were able to characterize the dynamics of the devices for some initial states. By employing a time-nonlocal master equation approach, we obtain the evolution for fermionic occupations, quantum correlations, and quantum coherences in both the Markovian and non-Markovian dissipating regimes. We investigate the interconversion of local coherence and bipartite correlations for the marginal states in each device. While the dynamics of the entanglement and quantum coherence depend quite strongly on the temperature of the reservoir for regular fermions, we found these evolutions are qualitatively similar for the case of Majorana bound states regardless of temperature. Our results illustrate the use of quantum information-theoretic measures to characterize the role of quantum resources in fermion systems.

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