WORKSHOP on FOUDATIONAL ISSUES in QUANTUM MECHANICS, INFORMATION, COMPUTING, AND CONTROL
THE WORKSHOP IS SELF-FUNDED. WE ACKNOWLEDGE THE GENEROUS COLLABORATION OF THE SPEAKERS
Full control by locally induced relaxation
aula dottorato - VENERDì 12 SETTEMBRE 2008, ore 11.00 >VITAE:
Daniel Burgarth is a Postdoc at the Mathematical Institute in Oxford. His main research interest is the physics of permanently coupled systems. Daniel is a co-founder and co-administrator of Quantiki.
We demonstrate a scheme for controlling a large quantum system by acting on a small subsystem only. The local control is mediated to the larger system by some fixed coupling Hamiltonian. The scheme allows to transfer arbitrary and unknown quantum states from a memory to the large system ("upload access") as well as the inverse ("download access"). We give sufficient conditions of the coupling Hamiltonian for the controllability of the system which can be checked efficiently by a colour-infection game on the graph that describes the couplings.
