Measurement-device-independent quantification of entanglement for given Hilbert space dimension

Measurement-device-independent quantification of entanglement for given Hilbert space dimension

Blog Article

We address the question of how much entanglement can be certified from the observed here correlations and the knowledge of the Hilbert space dimension of the measured systems.We focus on the case in which both systems are known to be qubits.For several correlations (though not for all), one can certify the same amount of entanglement as with state tomography, but with fewer assumptions, since nothing is assumed about the measurements.We also present security proofs of quantum key distribution (QKD) apunisw2 without any assumption on the measurements.

We discuss how both the amount of entanglement and the security of QKD are affected by the inefficiency of detectors in this scenario.