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Title: Coherent superposition of current flows in an atomtronic quantum interference device
Authors: Aghamalyan, D 
Cominotti, M
Rizzi, M
Rossini, D
Hekking, F
Minguzzi, A
Kwek, L.-C 
Amico, L 
Keywords: Backscattering
Coherent scattering
Forward scattering
Quantum computers
Quantum interference phenomena
Coherent backscattering
Coherent superpositions
Interaction strength
Momentum distributions
One-dimensional bosons
Persistent currents
Strong interaction
Two-level system
Quantum interference devices
Issue Date: 2015
Publisher: Institute of Physics Publishing
Citation: Aghamalyan, D, Cominotti, M, Rizzi, M, Rossini, D, Hekking, F, Minguzzi, A, Kwek, L.-C, Amico, L (2015). Coherent superposition of current flows in an atomtronic quantum interference device. New Journal of Physics 17 : 45023. ScholarBank@NUS Repository.
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. © 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
ISSN: 1367-2630
DOI: 10.1088/1367-2630/17/4/045023
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