Dynamics of quantum resources in regular and Majorana fermion systems

TL;DR

This paper investigates how quantum resources like entanglement and coherence evolve in fermionic systems, specifically Majorana and regular fermions coupled to a quantum dot, under dissipative conditions, revealing temperature-dependent and independent behaviors.

Contribution

It provides a comparative analysis of quantum resource dynamics in Majorana versus regular fermion systems using a time-nonlocal master equation approach.

Findings

Quantum coherence and entanglement depend on reservoir temperature in regular fermions.

Majorana fermions show temperature-independent quantum resource dynamics.

Quantum information measures effectively characterize resource roles in fermion systems.

Abstract

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.