2 research outputs found
Engineering massive quantum memories by topologically time-modulated spin rings
We introduce a general scheme to realize perfect storage of quantum
information in systems of interacting qubits. This novel approach is based on
{\it global} external controls of the Hamiltonian, that yield time-periodic
inversions in the dynamical evolution, allowing a perfect periodic quantum
state recontruction. We illustrate the method in the particularly interesting
and simple case of spin systems affected by XY residual interactions with or
without static imperfections. The global control is achieved by step
time-inversions of an overall topological phase of the Aharonov-Bohm type. Such
a scheme holds both at finite size and in the thermodynamic limit, thus
enabling the massive storage of arbitrarily large numbers of local states, and
is stable against several realistic sources of noise and imperfections.Comment: 12 pages, 9 figure
Geometric Effects and Computation in Spin Networks
When initially introduced, a Hamiltonian that realises perfect transfer of a
quantum state was found to be analogous to an x-rotation of a large spin. In
this paper we extend the analogy further to demonstrate geometric effects by
performing rotations on the spin. Such effects can be used to determine
properties of the chain, such as its length, in a robust manner. Alternatively,
they can form the basis of a spin network quantum computer. We demonstrate a
universal set of gates in such a system by both dynamical and geometrical
means