title: Maximally and minimally correlated states attainable within a closed evolving system.
abstract: The amount of correlation attainable between the components of a quantum system is constrained if the system is closed. We provide some examples, largely from the field of quantum thermodynamics, where knowing the maximal possible variation in correlations is useful. The optimization problem it raises requires us to search for the maximally and minimally correlated states on a unitary orbit, with and without energy conservation. This is fully solvable for the smallest system of two qubits. For larger systems, the problem is reduced to a manageable, classical optimization.
authors.affiliation: Controlled Quantum Dynamics Theory, Department of Physics, Imperial College London, London, United Kingdom.
authors.forename: Sania
authors.initials: S
authors.lastname: Jevtic
authors.forename: David
authors.initials: D
authors.lastname: Jennings
authors.forename: Terry
authors.initials: T
authors.lastname: Rudolph