195 research outputs found
Controlled Flow of Spin-Entangled Electrons via Adiabatic Quantum Pumping
We propose a method to dynamically generate and control the flow of
spin-entangled electrons, each belonging to a spin-singlet, by means of
adiabatic quantum pumping. The pumping cycle functions by periodic time
variation of localized two-body interactions. We develop a generalized approach
to adiabatic quantum pumping as traditional methods based on scattering matrix
in one dimension cannot be applied here. We specifically compute the flow of
spin-entangled electrons within a Hubbard-like model of quantum dots, and
discuss possible implementations and identify parameters that can be used to
control the singlet flow.Comment: 4 pages, 3 figure
Transparent, Non-local, Species-selective Transport in an Optical Superlattice Containing Two Interacting Atom Species
In an optical superlattice of triple wells, containing two mutually
interacting atom species in adjacent wells, we show that one species can be
transported through the positions of the other species, yet avoiding
significant overlap and direct interaction. The transfer protocol is optimized
to be robust against missing atoms of either species in any lattice site, as
well as against lattice fluctuations. The degree and the duration of the
inter-species overlap during passage can be tuned, making possible controlled
large-scale interaction-induced change of internal states.Comment: 7 pages and 5 figure
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