Readout of the atomtronic quantum interference device

Tobias Haug, Joel Tan, Mark Theng, Rainer Dumke, Leong-Chuan Kwek, and Luigi Amico
Phys. Rev. A 97, 013633 – Published 30 January 2018

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.

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  • Received 9 August 2017

DOI:https://doi.org/10.1103/PhysRevA.97.013633

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Tobias Haug1, Joel Tan1, Mark Theng1, Rainer Dumke1,2, Leong-Chuan Kwek1,3,4,5, and Luigi Amico1,3,6,7,8

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
  • 2Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
  • 3MajuLab, Centre National de la Recherche Scientifique, UNS-NUS-NTU International Joint Research Unit, UMI 3654 Singapore, Singapore
  • 4Institute of Advanced Studies, Nanyang Technological University, 60 Nanyang View, Singapore 639673, Singapore
  • 5National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore
  • 6Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, 95127 Catania, Italy
  • 7Consiglio Nazionale delle Ricerche, MATIS-IMM and Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Via Santa Sofia 64, 95127 Catania, Italy
  • 8LANEF “Chaire d'excellence,” Universitè Grenoble-Alpes and Centre National de la Recherche Scientifique, F-38000 Grenoble, France

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Issue

Vol. 97, Iss. 1 — January 2018

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