Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/105951
Title: Coherent superposition of current flows in an atomtronic quantum interference device
Authors: Aghamalyan, Davit
Cominotti, Marco
Rizzi, Matteo
Rossini, Davide
Hekking, Frank
Minguzzi, Anna
Kwek, Leong-Chuan
Amico, Luigi
Keywords: DRNTU::Science::Physics::Atomic physics
Issue Date: 2015
Source: Aghamalyan, D., Cominotti, M., Rizzi, M., Rossini, D., Hekking, F., Minguzzi, A., et al. (2015). Coherent superposition of current flows in an atomtronic quantum interference device. New Journal of Physics, 17, 045023-.
Series/Report no.: New Journal of Physics
Abstract: We consider a correlated Bose gas tightly confined into a ring shaped lattice, in the presence of an artificial gauge potential inducing a persistent current through it. A weak link painted on the ring acts as a source of coherent back-scattering for the propagating gas, interfering with the forward scattered current. This system defines an atomic counterpart of the rf-SQUID: the atomtronics quantum interference device. The goal of the present study is to corroborate the emergence of an effective two-level system in such a setup and to assess its quality, in terms of its inner resolution and its separation from the rest of the many-body spectrum, across the different physical regimes. In order to achieve this aim, we examine the dependence of the qubit energy gap on the bosonic density, the interaction strength, and the barrier depth, and we show how the superposition between current states appears in the momentum distribution (time-of-flight) images. A mesoscopic ring lattice with intermediate-to-strong interactions and weak barrier depth is found to be a favorable candidate for setting up, manipulating and probing a qubit in the next generation of atomic experiments.
URI: https://hdl.handle.net/10356/105951
http://hdl.handle.net/10220/26066
ISSN: 1367-2630
DOI: 10.1088/1367-2630/17/4/045023
Research Centres: Institute of Advanced Studies 
Rights: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:IAS Journal Articles

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