1,215 research outputs found
Quantum computation with cold bosonic atoms in an optical lattice
We analyse an implementation of a quantum computer using bosonic atoms in an
optical lattice. We show that, even though the number of atoms per site and the
tunneling rate between neighbouring sites is unknown, one may perform a
universal set of gates by means of adiabatic passage
Ultrastrong coupling few-photon scattering theory
We study the scattering of photons by a two-level system ultrastrongly
coupled to a one-dimensional waveguide. Using a combination of the polaron
transformation with scattering theory we can compute the one-photon scattering
properties of the qubit for a broad range of coupling strengths, estimating
resonance frequencies, lineshapes and linewidths. We validate numerically and
analytically the accuracy of this technique up to , close to the
Toulouse point , where inelastic scattering becomes relevant. These
methods model recent experiments with superconducting circuits [P.
Forn-D{\'\i}az et al., Nat. Phys. (2016)]
Mapping the spatial distribution of entanglement in optical lattices
We study the entangled states that can be generated using two species of
atoms trapped in independently movable, two-dimensional optical lattices. We
show that using two sets of measurements it is possible to measure a set of
entanglement witness operators distributed over arbitrarily large regions of
the lattice, and use these witnesses to produce two-dimensional plots of the
entanglement content of these states. We also discuss the influence of noise on
the states and on the witnesses, as well as connections to ongoing experiments.Comment: 2 figures, 6 page
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