59 research outputs found
Comment on "Force-field functor theory" [arXiv:1306.4332]
This comment regards a recently published preprint by R.Babbush,
J.A.Parkhill, and A.Aspuru-Guzik, arXiv:1306.4332.Comment: 2 page
Newton's cradle analogue with Bose-Einstein condensates
We propose a possible experimental realization of a quantum analogue of
Newton's cradle using a configuration which starts from a Bose-Einstein
condensate. The system consists of atoms with two internal states trapped in a
one dimensional tube with a longitudinal optical lattice and maintained in a
strong Tonks-Girardeau regime at maximal filling. In each site the wave
function is a superposition of the two atomic states and a disturbance of the
wave function propagates along the chain in analogy with the propagation of
momentum in the classical Newton's cradle. The quantum travelling signal is
generally deteriorated by dispersion, which is large for a uniform chain and is
known to be zero for a suitably engineered chain, but the latter is hardly
realizable in practice. Starting from these opposite situations we show how the
coherent behaviour can be enhanced with minimal experimental effort.Comment: To appear in Journal of Physics
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