Transition rates and their applications in accelerated single-qubit for fermionic spinor field coupling

TL;DR

This paper studies how a uniformly accelerated qubit interacts with fermionic fields, revealing that particle mass can protect against decoherence, with implications for quantum information in relativistic settings.

Contribution

It introduces a detailed analysis of transition rates and quantum coherence for accelerated qubits coupled to fermionic fields, highlighting the protective role of particle mass.

Findings

UDW detector responds more with fermionic fields

Quantum coherence degrades faster with fermionic coupling

Particle mass mitigates decoherence effects

Abstract

In this work, we investigate the interaction between a uniformly accelerated single qubit and a fermionic spinor field. Here we consider both the massless and the massive fermionic spinor fields. The qubit-field interaction occurs over a finite time and was evolved via perturbation theory. This approach yields the transition probability rates, from which we subsequently evaluate the quantum coherence of an Unruh-DeWitt (UDW) detector initially prepared in a qubit state. Our findings reveal that the UDW detector responds more when coupled with the fermionic field, and consequently, quantum coherence (for the fermionic case) degrades much more rapidly when compared to the case of the qubit linearly coupled with the scalar field. Moreover, the analysis suggests that particle mass plays a protective role against Unruh-induced decoherence as the rest mass energy becomes comparable to the detector's energy-level spacing, the detector's excitation probability and response decreases, which leads to the mitigation of quantum coherence degradation in accelerated quantum systems.