  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.

Quantum Physics