Graphical Methods in Device-Independent Quantum Cryptography

High-rate measurement-device-independent quantum cryptography

Finite-size analysis of measurement-device-independent quantum cryptography with continuous variables

Device-independent uncertainty for binary observables

We investigate entropic uncertainty relations for two or more binary measurements. We show that the effective anti-commutator is a useful measure of incompatibility and gives rise to strong uncertainty relations. Since the effective anti-commutator can be certified device-independently it leads us to device-independent uncertainty. Our relations, expressed in terms of conditional Rényi entropie...

Device-Independent Relativistic Quantum Bit Commitment

We examine the possibility of device-independent relativistic quantum bit commitment. We note the potential threat of location attacks, in which the behaviour of untrusted devices used in relativistic quantum cryptography depends on their space-time location. We describe relativistic quantum bit commitment schemes that are immune to these attacks, and show that these schemes offer device-indepe...

An Elementary Proof of Private Random Number Generation from Bell Inequalities

The field of device-independent quantum cryptography has seen enormous success in the past several years, including security proofs for key distribution and random number generation that account for arbitrary imperfections in the devices used. Full security proofs in the field so far are long and technically deep. In this paper we show that the concept of the mirror adversary can be used to sim...