2017/07/31 by Tobias Haug, Joel W. Q. Tan, Joel Tan +5 · 47 citations
Physics and Astronomy · #Bose–Einstein condensate #Coherence (philosophical gambling strategy) #Cold Atom Physics and Bose-Einstein Condensates #Electrical engineering #Interference (communication) #Persistent current #Physics #Quantum #Quantum mechanics #Quantum, superfluid, helium dynamics #Qubit #Ring (chemistry) #Strong Light-Matter Interactions #Superconductivity #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.1103/physreva.97.013633
published in Physical Review A 97(1) (American Physical Society)
openalex publication_date 2018/01/30 · arxiv created 2018/02/10 · arxiv updated 2018/02/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.