Flexible manipulation of bipartite and multipartite EPR steerings

TL;DR

This paper presents a versatile scheme for manipulating bipartite and multipartite quantum steerings using a spatially structured pump in an optical parametric oscillator, enabling control over steering types and directions for advanced quantum tasks.

Contribution

The authors introduce a flexible, experimentally feasible method to manipulate various forms of quantum steering by adjusting pump proportions with a spatial light modulator.

Findings

Effective manipulation of steering direction and type achieved.

Stricter genuine pentapartite steering demonstrated.

Scheme is versatile and experimentally feasible.

Abstract

Bipartite and multipartite quantum steerings are significant resources for various quantum tasks, such as ultrasecure multi-user quantum network, one-site-trusted quantum communication, high-fidelity quantum computation, etc. A flexible steering manipulation scheme of five down-converted Hermitian Gaussian modes generated from an optical parametric oscillator by 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.