Entanglement for any definition of two subsystems

Entanglement beyond Subsystems

We present a notion of generalized entanglement which goes beyond the conventional definition based on quantum subsystems. This is accomplished by directly defining entanglement as a property of quantum states relative to a distinguished set of observables singled out by Physics. While recovering standard entanglement as a special case, our notion allows for substantially broader generality and...

Bounds on entanglement in qudit subsystems

Vivien M. Kendon,* Karol Życzkowski, and William J. Munro Optics Section, Blackett Laboratory, Imperial College, London SW7 2BW, United Kingdom Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/44, 02-668 Warszawa, Poland Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol BS34 8QZ, United Kingdom ~Received 18 March 2002; revised manuscript received 31 Ma...

Entanglement and Nonlocality are Inequivalent for Any Number of Parties.

Understanding the relation between nonlocality and entanglement is one of the fundamental problems in quantum physics. In the bipartite case, it is known that these two phenomena are inequivalent, as there exist entangled states of two parties that do not violate any Bell inequality. However, except for a single example of an entangled three-qubit state that has a local model, almost nothing is...

Methodology for an Integrated Definition of a System and Its Subsystems: The Case-Study of an Airplane and Its Subsystems

Entanglement distribution over the subsystems and its invariance

We study the entanglement dynamics of two qubits, each of which is embedded into its local amplitude-damping reservoir, and the entanglement distribution among all the bipartite subsystems including qubit-qubit, qubit-reservoir, and reservoir-reservoir. It is found that the entanglement can be stably distributed among all components, which is much different to the result obtained under the Born...