Coherent superposition of current flows in an atomtronic quantum interference device
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...
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sg-ntu-dr.10356-1059512020-09-26T21:56:46Z Coherent superposition of current flows in an atomtronic quantum interference device Aghamalyan, Davit Cominotti, Marco Rizzi, Matteo Rossini, Davide Hekking, Frank Minguzzi, Anna Kwek, Leong-Chuan Amico, Luigi Institute of Advanced Studies DRNTU::Science::Physics::Atomic physics 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. Published version 2015-06-25T02:45:52Z 2019-12-06T22:01:24Z 2015-06-25T02:45:52Z 2019-12-06T22:01:24Z 2015 2015 Journal Article 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-. 1367-2630 https://hdl.handle.net/10356/105951 http://hdl.handle.net/10220/26066 10.1088/1367-2630/17/4/045023 en New Journal of Physics 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. application/pdf |
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DRNTU::Science::Physics::Atomic physics Aghamalyan, Davit Cominotti, Marco Rizzi, Matteo Rossini, Davide Hekking, Frank Minguzzi, Anna Kwek, Leong-Chuan Amico, Luigi Coherent superposition of current flows in an atomtronic quantum interference device |
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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. |
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Institute of Advanced Studies |
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Institute of Advanced Studies Aghamalyan, Davit Cominotti, Marco Rizzi, Matteo Rossini, Davide Hekking, Frank Minguzzi, Anna Kwek, Leong-Chuan Amico, Luigi |
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Article |
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Aghamalyan, Davit Cominotti, Marco Rizzi, Matteo Rossini, Davide Hekking, Frank Minguzzi, Anna Kwek, Leong-Chuan Amico, Luigi |
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Aghamalyan, Davit |
title |
Coherent superposition of current flows in an atomtronic quantum interference device |
title_short |
Coherent superposition of current flows in an atomtronic quantum interference device |
title_full |
Coherent superposition of current flows in an atomtronic quantum interference device |
title_fullStr |
Coherent superposition of current flows in an atomtronic quantum interference device |
title_full_unstemmed |
Coherent superposition of current flows in an atomtronic quantum interference device |
title_sort |
coherent superposition of current flows in an atomtronic quantum interference device |
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2015 |
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https://hdl.handle.net/10356/105951 http://hdl.handle.net/10220/26066 |
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