Concerted efforts are underway to establish an infrastructure for a global quantum Internet to
realise a spectrum of quantum technologies. This will enable more precise sensors, secure …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

The traditional view from particle physics is that quantum gravity effects should only become
detectable at extremely high energies and small length scales. Due to the significant …

We propose experimentally feasible means for nondestructive thermometry of
homogeneous Bose-Einstein condensates in different spatial dimensions (d∈{1, 2, 3}). Our …

Following the emergence of quantum computing, the subsequent quantum revolution will be
that of interconnecting individual quantum computers at the global level. In the same way …

We show that gravitational waves create phonons in a Bose–Einstein condensate (BEC). A
traveling spacetime distortion produces particle creation resonances that correspond to the …

The present Editorial introduces the Special Issue dedicated by the journal Universe to the
General Theory of Relativity, the beautiful theory of gravitation of Einstein, a century after its …

Quantum key distribution (QKD) is a pioneering quantum technology on the brink of
widespread deployment. Nevertheless, the distribution of secret keys beyond a few 100 km …

Quantum metrology studies the ultimate limit of precision in estimating a physical quantity if
quantum strategies are exploited. Here we investigate the evolution of a two-level atom as a …

Quantum metrology studies the ultimate precision limit of physical quantities by using
quantum strategy. In this paper we apply the quantum metrology technologies to the …