331 research outputs found
Enhancing the capacity and performance of collective atomic quantum memory
Present schemes involving the quantum non-demolition interaction between
atomic samples and off-resonant light pulses allow us to store quantum
information corresponding to a single harmonic oscillator (mode) in one
multiatomic system. We discuss the possibility to involve several coherences of
each atom so that the atomic sample can store information contained in several
quantum modes. This is achieved by the coupling of different magnetic sublevels
of the relevant hyperfine level by additional Raman pulses. This technique
allows us to design not only the quantum non-demolition coupling, but also beam
splitterlike and two-mode squeezerlike interactions between light and
collective atomic spin.Comment: 4 pages, 3 figures; minor changes in text and figs, more discussion
on quantum information processing. To appear in Phys. Rev. Let
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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