The concept of randomness plays an important part in many disciplines. On the one hand,
the question of whether random processes exist is fundamental for our understanding of …

A primary requirement for a robust and unconditionally secure quantum network is the
establishment of quantum nonlocal correlations over a realistic channel. While loophole-free …

Abstract $\textit {Device-independent quantum key distribution} $ protocols allow two honest
users to establish a secret key with minimal levels of trust on the provider, as security is …

We discuss quantum key distribution protocols and their security analysis, considering a
receiver-device-independent (RDI) model. The sender's (Alice's) device is partially …

It is well known that observing nonlocal correlations allows us to draw conclusions about the
quantum systems under consideration. In some cases this yields a characterisation which is …

Violation of a Bell inequality certifies that the underlying state must be entangled in a device-
independent way, although there exist some entangled states which do not violate such an …

Abstract Recently, Cavalcanti et al (2015) proposed a method to certify the presence of
entanglement in asymmetric networks, where some users do not have control over the …

The orbital angular momentum (OAM) of photons is a promising degree of freedom for high-
dimensional quantum key distribution (QKD). However, effectively mitigating the adverse …

Quantum Key Distribution (QKD) is a technique enabling provable secure communication
but faces challenges in device characterization, posing potential security risks. Device …

When two players achieve a superclassical score at a nonlocal game, their outputs must
contain intrinsic randomness. This fact has many useful implications for quantum …