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} } |
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URL | Mathew2015 |