KIP-Veröffentlichungen

Jahr 2015
Autor(en) R. Mathew, A. Kumar, S. Eckel, F. Jendrzejewski, G. K. Campbell, Mark Edwards, E. Tiesinga
Titel Self-heterodyne detection of the in-situ phase of an atomic superconducting quantum interference device
KIP-Gruppe(n) F21
Dokumentart Paper
Keywords (angezeigt) JQI
Quelle Phys. Rev. A 92 (2015) 033602
doi 10.1103/PhysRevA.92.033602
Abstract (en)

We present theoretical and experimental analysis of an interferometric measurement of the in situ phase drop across and current flow through a rotating barrier in a toroidal Bose-Einstein condensate (BEC). This experiment is the atomic analog of the rf-superconducting quantum interference device (SQUID). The phase drop is extracted from a spiral-shaped density profile created by the spatial interference of the expanding toroidal BEC and a reference BEC after release from all trapping potentials.We characterize the interferometer when it contains a single particle, which is initially in a coherent superposition of a torus and reference state, as well as when it contains a many-body state in the mean-field approximation. The single-particle picture is sufficient to explain the origin of the spirals, to relate the phase-drop across the barrier to the geometry of a spiral, and to bound the expansion times for which the in situ phase can be accurately determined. Mean-field estimates and numerical simulations show that the interatomic interactions shorten the expansion time scales compared to the single-particle case. Finally, we compare themean-field simulations with our experimental data and confirm that the interferometer indeed accurately measures the in situ phase drop.

bibtex
@article{Mathew2015,
  author   = {R. Mathew, A. Kumar, S. Eckel, F. Jendrzejewski, G. K. Campbell, Mark Edwards, E. Tiesinga},
  title    = {Self-heterodyne detection of the in-situ phase of an atomic superconducting quantum interference device},
  journal  = {Phys. Rev. A},
  year     = {2015},
  volume   = {92},
  pages    = {033602},
  doi      = {10.1103/PhysRevA.92.033602},
  url      = {http://link.aps.org/doi/10.1103/PhysRevA.92.033602}
}
Beispielbild
URL Mathew2015
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