We present a method to systematically identify and classify quantum optical nonclassical
states as classical or nonclassical based on the resources they create on a bosonic …

It is often thought that the super-sensitivity of a quantum state to an observable comes at the
cost of a decreased sensitivity to other non-commuting observables. For example, a …

Spin anticoherent states acquired recently a lot of attention as the most" quantum" states.
Some coherent and anticoherent spin states are known as optimal quantum rotosensors. In …

Majorana stars, the 2 S spin coherent states that are orthogonal to a spin-S state, offer an
elegant method to visualize quantum states, disclosing their intrinsic symmetries. These …

Even the most classical states are still governed by quantum theory. A number of physical
systems can be described by their Majorana constellations of points on the surface of a …

We demonstrate in theory and experiment the strict equivalence between nonclassical
polarization and the entanglement of indistinguishable photons, thereby unifying these two …

Quantum entanglement describes superposition states in multi-dimensional systems—at
least two partite—which cannot be factorized and are thus non-separable. Non-separable …

The crux of quantum optics is using beam splitters to generate entanglement, including in
pioneering experiments conducted by Hanbury-Brown and Twiss and Hong, Ou, and …

The Majorana stellar representation is used to characterize spin states that have a
maximally negative Wigner quasiprobability distribution on a spherical phase space. These …

Coherent-state representations are a standard tool to deal with continuous-variable systems,
as they allow one to efficiently visualize quantum states in phase space. Here, we work out …