Device-independent entanglement certification of all entangled states

TL;DR

This paper introduces a device-independent method to certify entanglement in all bipartite quantum states using quantum networks and correlation inequalities, advancing the reliability of quantum entanglement verification.

Contribution

It extends measurement-device-independent entanglement witnesses to a fully device-independent framework applicable to all entangled states.

Findings

Certifies entanglement without assumptions on devices

Applicable to all bipartite entangled states

Utilizes correlation inequalities in quantum networks

Abstract

We present a method to certify the entanglement of all bipartite entangled quantum states in a device-independent way. This is achieved by placing the state in a quantum network and constructing a correlation inequality based on an entanglement witness for the state. Our method is device-independent, in the sense that entanglement can be certified from the observed statistics alone, under minimal assumptions on the underlying physics. Conceptually, our results borrow ideas from the field of self-testing to bring the recently introduced measurement-device-independent entanglement witnesses into the fully device-independent regime.