Tunable asymmetric Einstein–Podolsky–Rosen steering of microwave photons in superconducting circuits
Kun Wu, Guangling Cheng, Aixi Chen · Journal of the Optical Society of America B · 2019
We present an alternative scheme for generating the asymmetric steering of microwave photons via using a superconducting circuit system, where a single Δ -type three-level fluxoninum qubit interacts dispersively with three superconducting resonators. The nondegenerate parametric down-conversion occurs among three microwave modes by adiabatically eliminating the atomic variables of the artificial atom, which is responsible for the existence of quantum correlation. Furthermore, the asymmetric steering is easily established with the help of coherent driving of the resonators, and its directionality can be controlled by adjusting the driving strengths to two modes among three modes without additional noise. The scheme we present is based on general quantum operations under conditions of decoherence and nonideal coupling efficiency, and the asymmetric steering of microwave photons is a useful resource for the construction of long-distance quantum communication networks in solid-state systems.