Some measurements in quantum mechanics disturb each other. This has puzzled physicists
since the formulation of the theory, but only in recent decades has the incompatibility of …

In contrast to the spatial Bell's inequalities which probe entanglement between spatially
separated systems, the Leggett–Garg inequalities test the correlations of a single system …

Quantum coherence is one of the primary non-classical features of quantum systems. While
protocols such as the Leggett-Garg inequality (LGI) and quantum tomography can be used …

Some of the stable isotopes of silicon and carbon have zero nuclear spin, whereas many of
the other elements that constitute semiconductors consist entirely of stable isotopes that …

In 1985, Leggett and Garg put forward the concept of macroscopic realism (macrorealism)
and, in analogy to Bell's theorem, derived a necessary condition in terms of inequalities …

Macroscopic realism is the name for a class of modifications to quantum theory that allow
macroscopic objects to be described in a measurement-independent manner, while largely …

We report on a stringent test of the nonclassicality of the motion of a massive quantum
particle, which propagates on a discrete lattice. Measuring temporal correlations of the …

We realize indirect partial measurement of a transmon qubit in circuit quantum
electrodynamics by interaction with an ancilla qubit and projective ancilla measurement with …

In ordinary, non-relativistic, quantum physics, time enters only as a parameter and not as an
observable: a state of a physical system is specified at a given time and then evolved …

Since Niels Bohr said this many years ago, quantum mechanics has only been getting more
shocking. We now realize that it's not really telling us that “weird” things happen out of sight …