title: Virtual quantum subsystems.
abstract: The physical resources available to access and manipulate the degrees of freedom of a quantum system define the set A of operationally relevant observables. The algebraic structure of A selects a preferred tensor product structure, i.e., a partition into subsystems. The notion of compoundness for quantum systems is accordingly relativized. Universal control over virtual subsystems can be achieved by using quantum noncommutative holonomies
authors.affiliation: Institute for Scientific Interchange Foundation, Viale Settimio Severo 65, I-10133 Torino, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Zanardi