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 …

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

Based on phase-space structures of quantum states, we propose a novel measure to
quantify macroscopic quantum superpositions. Our measure simultaneously quantifies two …

The quantum dynamics of colliding Bose-Einstein condensates with 150 000 atoms are
simulated directly from the Hamiltonian using the stochastic positive-P method. Two-body …

We consider how to generate and detect Einstein-Podolsky-Rosen (EPR) entanglement and
the steering paradox between groups of atoms in two separated potential wells in a Bose …

We consider two systems A and B that share Einstein–Podolsky–Rosen (EPR) steering
correlations and study how these correlations will decay when each of the systems is …

A cat state is formed as the steady-state solution for the signal mode of an ideal degenerate
parametric oscillator, in the limit of negligible single-photon signal loss. In the presence of …

We obtain a lower bound on the sum of two orthogonal spin component variances in a
plane. This gives a planar uncertainty relation which holds even when the Heisenberg …

A cat state is a superposition of two coherent states with amplitudes α 0 and− α 0. Recent
experiments create cat states in a microwave cavity field using superconducting circuits. As …

We analyze a method for the creation, storage, and retrieval of optomechanical Schrödinger
cat states, in which there is a quantum superposition of two distinct macroscopic states of a …