Chirality-induced one-way quantum steering between two waveguide-mediated ferrimagnetic microspheres

TL;DR

This paper demonstrates that chirality in waveguide electromagnetics enables one-way quantum steering between distant ferrimagnetic microspheres, with enhanced and tunable steering properties, offering a feasible approach for quantum information applications.

Contribution

It introduces a novel scheme for achieving and controlling one-way quantum steering using chirality in waveguide-mediated ferrimagnetic microspheres, which is more feasible than previous dissipation-based methods.

Findings

One-way quantum steering appears only with chirality.

Maximal steering increases with chirality degree.

Homodyne detection further enhances and asymmetrizes steering.

Abstract

One-way quantum steering is of importance for quantum technologies, such as secure quantum teleportation. In this paper, we study the generation of one-way quantum steering between two distant yttrium iron garnet (YIG) microspheres in chiral waveguide electromagonics. We consider that the magnon mode with the Kerr nonlinearity in each YIG sphere is chirally coupled to left- and right-propagating guided photons in the waveguide. We find that quantum steering between the magnon modes is absent with non-chirality but is present merely in the form of one way (i.e., one-way steering) when the chirality occurs. The maximal achievable steering is obviously improved as the chirality degree increases. We further find that when the waveguide's outputs are subjected to continuous homodyne detection, the steering can be considerably enhanced and asymmetric steering with strong entanglement can also be achieved by tuning the chirality. Our study shows that chirality can be explored to effectively realize one-way quantum steering. Compared to other studies on achieving asymmetric steering via controlling intrinsic dissipation, e.g. cavity loss rates, our scheme merely depends on the chirality enabled via positioning the micromagnets in the waveguide and is continuously adjustable and experimentally more feasible.