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arXiv:1103.0539 · Physical Review A

Transparent nonlocal species-selective transport in an optical superlattice containing two interacting atom species

Miroslav Gajdacz, Tomáš Opatrný, Kunal K. Das

Published Mar 24, 2011• 9 citations
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Abstract

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 while 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 interspecies overlap during passage can be tuned, making possible a controlled large-scale interaction-induced change of internal states.

DOI
10.1103/physreva.83.033623

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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 while 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 interspecies overlap during passage can be tuned, making possible a controlled large-scale interaction-induced change of internal states.
We present a coherent filtering scheme which dramatically reduces the site occupation number defects for atoms in an optical lattice by transferring a chosen number of atoms to a different internal state via adiabatic passage. With the addition of superlattices it is possible to engineer states with a specific number of atoms per site (atomic crystals), which are required for quantum computation and the realization of models from condensed matter physics, including doping and spatial patterns. The same techniques can be used to measure two-body spatial correlation functions.
We propose to use a quantum ratchet to transport quantum information in a chain of atoms trapped in an optical superlattice. The quantum ratchet is created by a continuous modulation of the optical superlattice which is periodic in time and in space. Though there is zero average force acting on the atoms, we show that indeed the ratchet effect permits atoms on even and odd sites to move along opposite directions. By loading the optical lattice with two-level bosonic atoms, this scheme permits us to perfectly transport a qubit or entangled state imprinted in one or more atoms to any desired position in the lattice. From the quantum computation point of view, the transport is achieved by a smooth concatenation of perfect swap gates. We analyze setups with noninteracting and interacting particles and in the latter case we use the tools of optimal control to design optimal modulations. We also discuss the feasibility of this method in current experiments.
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We describe new techniques in the construction of optical lattices to realize a coherent atom-based microscope, comprised of two atomic species used as target and probe atoms, each in an independently controlled optical lattice. Precise and dynamic translation of the lattices allows atoms to be brought into spatial overlap to induce atomic interactions. For this purpose, we have fabricated two highly stable, hexagonal optical lattices, with widely separated wavelengths but identical lattice constants using diffractive optics. The relative translational stability of 12 nm permits controlled interactions and even entanglement operations with high fidelity. Translation of the lattices is realized through a monolithic electro-optic modulator array, capable of moving the lattice smoothly over one lattice site in 11 micros, or rapidly on the order of 100 ns.
We investigate coherent atomic tunneling of a dilute gas Bose-Einstein condensate (BEC) in a three-well system. In particular, we generalize stimulated Raman adiabatic passage (STIRAP) to adiabatically transport a BEC of 2000 7Li^{7}\mathrm{Li}7Li atoms between two wells with minimal occupation in the intervening well. This protocol paves the way for a robust method of control in atom-optical devices.
A scheme for addressing individual atoms in one- or two-dimensional optical lattices loaded with one atom per site is proposed. The scheme is based on position-dependent atomic population transfer induced by several standing-wave driving fields. This allows various operations important in quantum-information processing, such as manipulation and measurement of any single-atom, two-qubit operations between any pair of adjacent atoms, and patterned loading of the lattice with one atom per every nth site for arbitrary n. The proposed scheme is robust against considerable imperfections and actually within reach of current technology.