Harvesting asymmetric steering via non-identical detectors

TL;DR

This paper explores how non-identical detectors with different energy gaps can harvest asymmetric quantum steering from vacuum fields, revealing richer properties than entanglement.

Contribution

It demonstrates that energy gap differences can enhance asymmetric steering harvesting and induce transitions between two-way and one-way steering.

Findings

Energy gap differences enlarge A→B steering range.

Maximal asymmetry can cause sudden death of B→A steering.

Asymmetric steering exhibits richer properties than entanglement.

Abstract

We investigate asymmetric steering harvesting phenomenon involving two non-identical inertial detectors with different energy gaps, which interact locally with vacuum massless scalar fields. Our study assumes that the energy gap of detector $B$ exceeds that of detector $A$. It is shown that $A\rightarrow B$ steerability is bigger that $B\rightarrow A$ steerability, implying that the observer with a small energy gap has more stronger steerability than the other one. We find that the energy gap difference can enlarge the harvesting-achievable range of $A\rightarrow B$ steering, while it can also narrow the harvesting-achievable range of $B\rightarrow A$ steering at the same time. In addition, the maximal steering asymmetry indicates the transformation between two-way steering and one-way steering in some cases, showing that $B\rightarrow A$ steering suffers ``sudden death" at the point of this parameter. These results suggest that asymmetric steering exhibits richer and more interesting properties than quantum entanglement harvested from vacuum quantum field.