Title: Quantum Control of Coupled Spin Systems: Algebraic and Open System Approach

Speaker: Daniel Burgarth, Oxford

We compare two independent methods of controlling qubits which are coupled
by an always-on Hamiltonian. In either case, it is possible to perform
algorithms on large arrays by acting on a small subset. While the
algebraic method has the advantage of requiring minimal resources, the
open system approach provides an explicit way how to achieve control. We
give examples of systems which are controllable only by the open system
approach and show new results on spin chains as universal quantum
interfaces.