Progress in studying entanglement and steering from the macroscopic view

Yu Xiang, Shuming Cheng, Qihuang Gong +2 more

Recent progress and future possibilities for EPR steering are presented, highlighting practical applications and experimental aspects in multipartite, high-dimensional, and atomic and macroscopic systems.

Wenxue Zhong, Qianjun Zheng, Guangling Cheng +1 more

Here, we propose to generate the nonreciprocal macroscopic entanglement and steering of magnon modes from three yttrium iron garnet spheres, which are placed in a spinning microwave resonator damped by a squeezed reservoir. Strikingly, the genuine entanglement and steering among three magnons can be achieved due to the correlation transfer from squeezed microwave to three magnons and the steady-state entanglement and steering show strong robustness against temperature. Furthermore, the nonreciprocal tripartite entanglement and steering are simultaneously existent based on Fizeau light-dragging effect by spinning the resonator at the steady state, which provides an alternative way to manipulate nonreciprocal effects in a cavity magnonical system and may have potential applications in manipulating the macroscopic quantum states of the multipartite system.

Vlatko Vedral

J. Smetana, Tianliang Yan, Vincent Boyer +1 more

Interferometric sensors provide an excellent opportunity for studying novel aspects of quantum mechanics. In this paper, we present the updated design for a suspended, cryogenically cooled table-top interferometer that can operate at the standard quantum limit of sensitivity. In this mode of operation, we will be able to probe aspects of macroscopic entanglement, quantum correlations, and semi-classical and quantum gravity models. We present the up-to-date experimental progress as well as the results of ongoing investigations.