Entanglement beyond subsystems

  title={Entanglement beyond subsystems},
  author={Lorenza Viola and Howard Barnum and Emanuel Knill and Gerardo Guzman Ortiz and Rolando D. Somma},
  journal={arXiv: Quantum Physics},
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 flexibility, being applicable, in particular, to situations where existing tools are not directly… 
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