An entanglement is a complicated or difficult relationship or situation. romantic entanglements. a military and political entanglement the Government probably doesn't want
A non-classical correlation between two quantum systems most strongly exhibited by the maximally entangled states such as the Bell states for two qubits, and considered to be absent in mixtures of product states (which are called ``separable'' states) Often states that are not separable are considered to be entangled However, nearly separable states do not exhibit all the features of maximally entangled states As a result, studies of different types of entanglement are an important component of quantum information theory