Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long Phase Coherence Time and Number Squeezing of two Bose-Einstein
  Condensates on an Atom Chip   We measured the relative phase of two Bose-Einstein condensates confined in
an radio frequency induced double well potential on an atom chip. We observed
phase coherence between the separated condensates for times up to 200 ms after
splitting, a factor of 10 beyond the phase diffusion limit expected for a
coherent state in our experimental conditions (20 ms). The enhanced coherence
time is attributed to number squeezing of the initial state by a factor of 10.
In addition, we demonstrated a rotationally sensitive (Sagnac) geometry for a
guided atom interferometer by propagating the split condensates.

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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph