Year: 2018
Type: article
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.
Source: Physical Review A
Authors: Tobias Haug, Joel Tan, Mark Theng, Rainer Dumke, Leong-Chuan Kwek, Luigi Amico
Institutions: Centre for Quantum Technologies, National University of Singapore, Nanyang Technological University, Centre National de la Recherche Scientifique, National Institute of Education, UMI MajuLab, University of Catania, Istituto Nazionale di Fisica Nucleare, Sezione di Catania, National Research Council, Institute for Microelectronics and Microsystems, Université Grenoble Alpes
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2740328873