Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/19571
Title: 
Authors: 
Issue Date: 
2018
Citation: 
Haug, T., Tan, J., Theng, M., Dumke, R., Kwek, L. C., & Amico, L. (2018). Readout of the atomtronic quantum interference device. Physical Review A, 97, Article 013633. http://doi.org/10.1103/PhysRevA.97.013633
Abstract: 
A Bose-Einstein condensate confined in ring shaped lattices interrupted by a weak link and pierced by an
effective magnetic flux defines the atomic counterpart of the superconducting quantum interference device: the
atomtronic quantum interference device (AQUID). In this paper, we report on the detection of current states in
the system through a self-heterodyne protocol. Following the original proposal of the NIST and Paris groups,
the ring-condensate many-body wave function interferes with a reference condensate expanding from the center of the ring. We focus on the rf AQUID which realizes effective qubit dynamics. Both the Bose-Hubbard and Gross-Pitaevskii dynamics are studied. For the Bose-Hubbard dynamics, we demonstrate that the self-heterodyne protocol can be applied, but higher-order correlations in the evolution of the interfering condensates are measured to readout of the current states of the system. We study how states with macroscopic quantum coherence can be told apart analyzing the noise in the time of flight of the ring condensate.
URI: 
ISSN: 
2469-9926 (print)
2469-9934 (online)
DOI: 
File Permission: 
Open
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