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  • Letter
  • Open Access

Coherent phase slips in coupled matter-wave circuits

A. Pérez-Obiol1,*,†, J. Polo2,*,‡, and L. Amico3,4,5,§

  • 1Barcelona Supercomputing Center, 08034 Barcelona, Spain
  • 2Quantum Research Centre, Technology Innovation Institute, Abu Dhabi, United Arab Emirates
  • 3INFN-Sezione di Catania, Via Santa Sofia 64, 95127 Catania, Italy
  • 4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
  • 5LANEF “Chaire d'Excellence”, Université Grenoble-Alpes & CNRS, F-38000 Grenoble, France

  • *These authors contributed equally to this work.
  • †axel.perezobiol@bsc.es
  • ‡juan.polo@tii.ae
  • §On leave from Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Catania, Italy.
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Phys. Rev. Research 4, L022038 – Published 17 May, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L022038

Abstract

Quantum phase slips are a dual process of particle tunneling in coherent networks. Besides being of central interest to condensed matter physics, quantum phase slips are resources that are sought to be manipulated in quantum circuits. Here, we devise a specific matter-wave circuit enlightening quantum phase slips. Specifically, we investigate the quantum many-body dynamics of two side-by-side ring-shaped neutral bosonic systems coupled through a weak link. By imparting a suitable magnetic flux, persistent currents flow in each ring with given winding numbers. We demonstrate that coherent phase slips occur as winding number transfer among the two rings, with the populations in each ring remaining nearly constant. Such a phenomenon occurs as a result of a specific entanglement of circulating states, that, as such, cannot be captured by a mean-field treatment of the system. Our work can be relevant for the observation of quantum phase slips in cold-atom experiments and their manipulation in matter-wave circuits. To make contact with the field, we show that the phenomenon has clear signatures in the momentum distribution of the system providing the time-of-flight image of the condensate.

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Phys. Rev. Research 4, L022038– Published 17 May, 2022
  • Received 20 December 2021
  • Accepted 18 March 2022
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