Remote nonreciprocal optical-microwave entanglement and one-way steering via parametric amplification
Phys. Rev. A 113, 063730 – Published 18 June, 2026
DOI: https://doi.org/10.1103/syd1-f5q8
Abstract
We propose a scheme to generate remote nonreciprocal entanglement and one-way steering between spatially separated optical and microwave modes via parametric amplification. Both entanglement and one-way steering emerge when the system is driven from a specific direction, while being fully suppressed under reverse driving. This nonreciprocity originates from asymmetric detuning induced by directional optical squeezing. Remarkably, compared with the opposite driving direction, the bipartite entanglement is enhanced by approximately a factor of 1.5, while the one-way steering is amplified by about 3.8 times, due to a chiral interaction induced by directional optical squeezing. The enhancement and suppression of these quantum correlations can be actively controlled by tuning the squeezing phase. In addition, increasing the magnon-microwave coupling splits the initially single entanglement and steering peak into two peaks, thereby providing additional detuning windows for nonreciprocal operation. Our scheme provides an all-optical approach for the controllable switching of remote quantum correlations between optical and microwave fields, which may be useful for realizing remote hybrid chiral quantum networks.
