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Title: Readout of the atomtronic quantum interference device
Authors: Haug, Tobias
Tan, Joel
Theng, Mark
Dumke, Rainer
Kwek, Leong-Chuan
Amico, Luigi
Keywords: Atomtronic Quantum Interference Device
Issue Date: 2018
Source: 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(1), 013633-.
Series/Report no.: Physical Review A
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.
ISSN: 2469-9926
Rights: © 2018 American Physical Society. This paper was published in Physical Review A and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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