Seminar series
Date
Tue, 06 May 2008
Time
12:00 -
13:00
Location
L3
Speaker
Daniel Burgarth
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.