Flexible manipulation of bipartite and multipartite Einstein-Podolsky-Rosen steering
Yunyun Liang, Jing Zhang, Rongguo Yang, Tiancai Zhang, Jiangrui Gao · Physical Review A · 2025
Bipartite and multipartite quantum steerings are significant resources for various quantum tasks such as ultrasecure multiuser quantum networks, one-site-trusted quantum communication, and high-fidelity quantum computation. A flexible steering manipulation scheme of five down-converted Hermitian Gaussian modes generated from an optical parametric oscillator using a spatial structured pump is presented. In our scheme, not only the direction and types of the bipartite steering, but also different situations of multipartite steering can be manipulated effectively, by adjusting the pump proportions with a spatial light modulator. In addition, stricter genuine pentapartite steering (only one site is trusted) can also be achieved by making the pump proportions as balanced as possible. Our scheme is versatile and experimentally feasible and offers new insights into the manipulation of steering, especially multipartite steering, which is valuable in many special quantum tasks.