What is system II

What is it about?

Relativity of 'system' and entanglement can be expressed in terms of local operations - LOCC in the quantum information science and practice. Different structures provide different quantum information processing potential of the composite system. So, locality is also relative in quantum context: it depends solely on the choice of the observables to be measured.

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Why is it important?

Operationally, quantum information processing does not require actions to provide entanglement in the system. For most of the composite systems, targeting alternative degrees of freedom provides operational use of entanglement, which is virtually universally present for those alternative degrees of freedom (structure) of the composite system.