In this review we present the problem of time in quantum physics, including a short history of
the problem and the known objections about considering time as a quantum observable …

This article generalizes the conditional probability interpretation of time in which time
evolution is realized through entanglement between a clock and a system of interest. This …

Recent advances in quantum resource theories have been driven by the fact that many
quantum information protocols make use of different facets of the same physical features, eg …

In the past few decades, researchers have created a veritable zoo of quantum algorithm by
drawing inspiration from classical computing, information theory, and even from physical …

In the quantization of gauge theories and quantum gravity, it is crucial to treat reference
frames such as rods or clocks not as idealized external classical relata, but as internal …

We present a covariant quantum formalism for scalar particles based on an enlarged Hilbert
space. The particular physical theory can be introduced through a timeless Wheeler DeWitt …

We consider a global quantum system (the “Universe”) satisfying a double constraint, both
on total energy and total momentum. Generalizing the Page and Wootters quantum clock …

The local conservation of a physical quantity whose distribution changes with time is
mathematically described by the continuity equation. The corresponding time parameter …

Energy-time uncertainty plays an important role in quantum foundations and technologies,
and it was even discussed by the founders of quantum mechanics. However, standard …

The conventional phase space of classical physics treats space and time differently, and this
difference carries over to field theories and quantum mechanics (QM). In this paper, the …