Virtual Quantum Subsystems

Abstract

The physical resources available to access and manipulate the degrees of freedom of a quantum system define the set $\mathcal{A}$ of operationally relevant observables. The algebraic structure of $\mathcal{A}$ selects a preferred tensor product structure i.e., a partition into subsystems. The notion of compoundness for quantum system is accordingly relativized. Universal control over virtual subsystems can be achieved by using quantum noncommutative holonomies

Presentation improved, to appear in PRL. 4 Pages, RevTeX

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