Highly nonclassical character of optical quantum detectors, such as single-photon is essential for preparation states light and a vast majority applications in metrology information processing. Therefore, it both fundamentally interesting practically relevant to investigate the features measurements. Here we propose experimentally demonstrate procedure direct certification non-Gaussianity Wigne...

We studied the effect of delocalized single-photon addition (DPA) on two input modes containing four cases: independent coherent states (CSs), thermal (TSs), single-mode squeezed vacuums (SVs), and an entangled two-mode vacuum (TMSV). In essence, types new non-Gaussian light are generated. three different resources (including entanglement, discorrelation Wigner negativity) for each state. The o...

Bell-inequality violation and entanglement, measured by Wootters’ concurrence and negativity, of two qubits initially in Werner or Werner-like states coupled to thermal reservoirs are analyzed within the master equation approach. It is shown how this simple decoherence process leads to generation of states manifesting the relativity of two-qubit entanglement measures.  2004 Elsevier B.V. All r...

We study the entanglement properties of a closed chain of harmonic oscillators that are coupled via a translationally invariant Hamiltonian, where the coupling acts only on the position operators. We consider the ground state and thermal states of this system, which are Gaussian states. The entanglement properties of these states can be completely characterized analytically when one uses the lo...

We study the dynamics of two three-level atoms interacting with independent bosonic Lorentzian reservoirs at zero temperature. Such systems can be created in far astronomical objects. Quantum mechanical behaviour of these particles can produce detectable effects on the spectroscopic identifications of these objects, if such behaviour remain stable during the interaction with their media. It is ...

Topologically-ordered phases of matter at nonzero temperature are conjectured to exhibit universal patterns long-range entanglement, which can be detected using the entanglement negativity, a mixed-state measure. In this paper, we show that negativity in certain topological orders understood through properties an emergent symmetry-protected (SPT) order is localized on bipartition. This connecti...