Quantum
control and information processing in optical lattices
(pp20-32)
Poul S. Jessen, David L. Haycock, Gerd Klose, G.A. Smith, Ivan H.
Deutsch, and Gavin K. Brennen
doi:
https://doi.org/10.26421/QIC1.s-5
Abstracts:
Neutral atoms offer a promising platform for single- and
many-body quantum control, as required for quantum information
processing. This includes excellent isolation from the decohering
influence of the environment, and the existence of well developed
techniques for atom trapping and coherent manipulation. We present a
review of our work to implement quantum control and measurement for
ultra-cold atoms in far-off-resonance optical lattice traps. In recent
experiments we have demonstrated coherent behavior of mesoscopic atomic
spinor wavepackets in optical double-well potentials, and carried out
quantum state tomography to reconstruct the full density matrix for the
atomic spin degrees of freedom. This model system shares a number of
important features with proposals to implement quantum logic and quantum
computing in optical lattices. We present a theoretical analysis of a
protocol for universal quantum logic via single qubit operations and an
entangling gate based on electric dipole-dipole interactions. Detailed
calculations including the full atomic hyperfine structure suggests that
high-fidelity quantum gates are possible under realistic experimental
conditions.
Key words: quantum
control, quantum information processing |