Quantum Steering: Practical Challenges and Perspectives

TL;DR

This paper reviews quantum steering, highlighting recent advances, current challenges, and future directions, including larger-scale systems and multi-party networks, emphasizing its importance in quantum information science.

Contribution

It provides a comprehensive overview of quantum steering, emphasizing recent progress, challenges, and future research directions in the field.

Findings

Recent progress in quantum steering techniques

Identification of current challenges in practical implementation

Proposals for future research on high-dimensional and multi-party steering networks

Abstract

Einstein-Rosen-Podolsky (EPR) steering or quantum steering describes the "spooky-action-at-a-distance" that one party is able to remotely alter the states of the other if they share a certain entangled state. Generally, it admits an operational interpretation as the task of verifying entanglement without trust in the steering party's devices, making it lying intermediate between Bell nonlocality and entanglement. Together with the asymmetrical nature, quantum steering has attracted a considerable interest from theoretical and experimental sides over past decades. In this Perspective, we present a brief overview of the EPR steering with emphasis on recent progress, discuss current challenges, opportunities and propose various future directions. We look to the future which directs research to a larger-scale level beyond massless and microscopic systems to reveal steering of higher dimensionality, and to build up steered networks composed of multiple parties.