We consider the distribution of secret keys, both in a bipartite and a multipartite (conference)
setting, via a quantum network and establish a framework to obtain bounds on the …

Quantum speed limit is bound on the minimum time a quantum system requires to evolve
from an initial state to final state under a given dynamical process. It sheds light on how fast …

As quantum theory allows for information processing and computing tasks that otherwise are
not possible with classical systems, there is a need and use of quantum Internet beyond …

We provide several general upper bounds on the rate of a key secure against a quantum
adversary in the device-independent conference key agreement (DI-CKA) scenario. They …

Here, we present the most general framework for n-particle Hardy's paradoxes, which
include Hardy's original one and Cereceda's extension as special cases. Remarkably, for …

Depending on the way one measures, quantum nonlocality might manifest more visibly.
Using basis transformations and interactions on a particle pair, Hardy logically argued that …

In this work, we deal with the relaxation of two central assumptions in standard locally
realistic hidden variable (LRHV) inequalities: free will in choosing measurement settings …

It remains an open question how a realist view of the macroscopic world emerges from a
quantum formalism. For testing the macrorealism in the quantum domain, an interesting …

For multilevel spin systems, robustness of the quantum mechanical (QM) violation of
macrorealism (MR) with respect to coarse-grained measurements is investigated using three …

In this paper, we investigate the Leggett–Garg inequality (LGI), the Wigner form of Leggett–
Garg inequality (WLGI) and the no-signaling-in-time (NSIT) condition under projective and …