In physics, every observation is made with respect to a frame of reference. Although
reference frames are usually not considered as degrees of freedom, in all practical situations …

The problem of time in quantum gravity calls for a relational solution. Using quantum
reduction maps, we establish a previously unknown equivalence between three approaches …

Treating reference frames fundamentally as quantum systems is inevitable in quantum
gravity and also in quantum foundations once considering laboratories as physical systems …

Gravity mediated entanglement (GME) has been proposed as the first experimentally
testable signature of quantum gravity. However, to what extent the effect is due to quantum …

At the intersection of quantum theory and relativity lies the possibility of a clock experiencing
a superposition of proper times. We consider quantum clocks constructed from the internal …

Experiments are beginning to probe the interaction of quantum particles with gravitational
fields beyond the uniform-field regime. In nonrelativistic quantum mechanics, the …

One of the most basic notions in physics is the partitioning of a system into subsystems and
the study of correlations among its parts. In this Letter, we explore this notion in the context of …

We challenge the view that there is a basic conflict between the fundamental principles of
Quantum Theory and General Relativity and, in particular, the fact that a superposition of …

In general relativity, the description of spacetime relies on idealised rods and clocks, which
identify a reference frame. In any concrete scenario, reference frames are associated to …

We study the leptonic and semileptonic D-meson decays (D→ ℓ+ ν ℓ and D→ K (*) ℓ+ ν ℓ) in
the framework of covariant quark model with built-in infrared confinement. We compute the …