Structures and Phase Transitions

The nonlocal nature of quantum entanglement has remained a subject of great interest since the earliest days of quantum mechanics as it causes many of the paradoxes and lies at the heart of the profound difference between quantum mechanics and classical physics. Quantum entanglement is observed primarily for simple quantum objects (photons or/and atoms) in environments specially designed to minimize quantum decoherence and dissipation. In the condensed matter, an initially entangled subsystem loses its ability to exhibit quantum interference by getting entangled via interaction with the ambient degrees of freedom. However, the exotic behavior of superconductivity and superfluidity, along with that of laser light, are manifestations of macroscopic quantum effects.