For systems consisting of distinguishable particles, there exists an agreed upon notion of
entanglement which is fundamentally based on the possibility of addressing individually …

Entanglement is nowadays considered as a key quantity for the understanding of
correlations, transport properties and phase transitions in composite quantum systems, and …

Quantum nonlocality is typically assigned to systems of two or more well-separated particles,
but nonlocality can also exist in systems consisting of just a single particle when one …

We outline a proof that teleportation with a single particle is, in principle, just as reliable as
with two particles. We thereby hope to dispel the skepticism surrounding single-photon …

We critically analyze the commonly maintained statement that entanglement is necessary to
beat the shot-noise limit or standard quantum limit (SQL) in the sensitivity with which certain …

Natural particle-number entanglement resides between spatial modes in coherent ultracold
atomic gases. However, operations on the modes are restricted by a superselection rule that …

We analyze a general bipartite-like representation of arbitrary pure states of N
indistinguishable partcles, valid for both bosons and fermions, based on M-and (N− M) …

Relativistic causality has dramatic consequences on the measurability of nonlocal variables
and poses the fundamental question of whether it is physically meaningful to speak about …

Theoretical considerations of Bell-inequality experiments usually assume identically
prepared and independent pairs of particles. Here we consider pairs that exhibit both …

Superselection rules (SSRs) constrain the allowed states and operations in quantum theory.
They limit preparations and measurements and hence impact our ability to observe non …