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Article overview
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Large quantum superpositions of a nanoparticle immersed in superfluid helium | | Oleg Lychkovskiy
; | | Date: |
2 Apr 2015 | | Abstract: | Preparing and detecting spatially extended quantum superpositions of a
massive object comprises an important fundamental test of quantum theory.
State-of-the-art experiments demonstrate quantum interference of
nanometer-sized molecules with mass $sim 10^4$ amu. A number of experiments
have been proposed to push the mass limit several orders of magnitude further.
All the experimental setups considered up to date require that the nanoparticle
is isolated in a sufficiently high vacuum in order to avoid collisional
decoherence. We argue that superfluid helium is a viable alternative to vacuum
as a low-decoherence medium. Indeed, for an object moving in a pure superfluid
at zero temperature with a velocity less than the critical one decoherence is
absent since the object can not create any excitations of the superfluid. In
real life impurities and thermal excitations will cause decoherence. We show
that it is low enough to permit interference experiments with nanoparticles
well beyond the current mass limit. While the robustness of spatial
superpositions of an objects surrounded by dense medium is remarkable in its
own right, performing interference experiments in superfluid helium can provide
some practical advantages compared to conventional schemes, e.g. effective
cooling and compensation of gravity by the buoyancy force. | | Source: | arXiv, 1504.0682 | | Services: | Forum | Review | PDF | Favorites | |
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