Communication channel of fermionic system in accelerated frame

TL;DR

This paper analyzes the behavior of fermionic communication channels in accelerated frames, revealing differences between classical and quantum channels at high acceleration and emphasizing the limitations of single-mode approximations.

Contribution

It provides new insights into fermionic channel capacities under acceleration, highlighting the superiority of dual rail entangled states and the inadequacy of single-mode approximation.

Findings

Mutual information of quantum channels converges at infinite acceleration.

Conditional entropy vanishes for quantum channels at infinite acceleration.

Dual rail entangled states outperform single rail states beyond the single mode approximation.

Abstract

In this article, we investigate the communication channel of fermionic system in an accelerated frame. We observe that at the infinite acceleration, the mutual information of single rail quantum channel coincides with that of double rail quantum channel, but those of classical ones reach different values. Furthermore, we find that at the infinite acceleration, the conditional entropy of single(or double) rail quantum channel vanishes, but those of classical ones may have finite values. In addition, we see that even when considering a method beyond the single mode approximation, the dual rail entangled state seems to provide better channel capacity than the single rail entangled state, unlike the bosonic case. Moreover, we find that the single-mode approximation is not sufficient to analyze the communication channel of fermionic system in an accelerated frame.