Device-Independent Quantum Key Distribution Using Entangled Atoms

Device- independent quantum key distribution is the art of establishing secure keys over untrusted channels even when using potentially untrusted devices [1]. It allows the users to check the secure functioning of the underlying quantum devices by a statistical test using a Bell inequality, thereby also ensuring security against implementation flaws-a major vulnerability to quantum key distribution protocols realized so far. An experimental realisation, however, is challenging because it demands high-quality entanglement shared between two remote locations that can be detected with high efficiency.