Large-scale quantum effects have always played an important role in the foundations of
quantum theory. With recent experimental progress and the aspiration for quantum …

Macroscopic realism, the classical world view that macroscopic objects exist independently
of and are not influenced by measurements, is usually tested using Leggett-Garg …

Uncertainty relations involving incompatible observables are one of the cornerstones of
quantum mechanics. Aside from their fundamental significance, they play an important role …

We show how a test of macroscopic realism based on Leggett-Garg inequalities (LGIs) can
be performed in a macroscopic system. Using a continuous-variable approach, we consider …

We present a theoretical study of entanglement in ensembles consisting of an arbitrary
number of particles. Multipartite entanglement criteria in terms of observables are formulated …

General wisdom tells us that if two quantum states are “macroscopically distinguishable”
then their superposition should be hard to observe. We make this intuition precise and …

Beam splitters are routinely used for generating entanglement between modes in the optical
and microwave domains, requiring input states that are not convex combinations of coherent …

A quantum cellular automaton (QCA) is an abstract model consisting of an array of finite-
dimensional quantum systems that evolves in discrete time by local unitary operations. Here …

We propose a method to create “spin cat states,” ie, macroscopic superpositions of coherent
spin states, in Bose-Einstein condensates using the Kerr nonlinearity due to atomic …

Abstract The Leggett–Garg inequality (LGI) is used to test incompatibility between the
classical world view of macrorealism and quantum mechanics. Except for the LGI, other …