Abstract
We propose to generate localized artificial magnetic fields using two thin Raman laser beams intersected at a narrow region of a two-leg ladder, where the frequency difference must approximately match the energy offset between the two legs. Based on this method, we investigate the single-atom transport in a two-leg ladder with only two rungs, which, together with the legs, enclose a localized artificial magnetic flux. Here, the atoms on the two legs (channels) possess different onsite energies that produce another energy offset. We find that the atom incoming from the left channel can experience from blockade to transparency via modifying the onsite energy, tunneling strength, or magnetic flux, which can be potentially used for a quantum switcher. Furthermore, the atom incoming from the left channel can also be perfectly routed into the right leg, when, intriguingly, the outgoing atom in the right channel possesses a quasimomentum that can be modulated by the magnetic flux. The result may be potentially used for the interface that controls the communication between two individual quantum devices of cold atoms. The method can also be generalized to other artificial quantum systems, such as superconducting quantum circuit systems, optical systems, etc.2 MoreReceived 10 April 2020Accepted 19 August 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.033484Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCoherent controlScattering theoryAtomic, Molecular & OpticalQuantum Information
Highlights
The artificial tunability has made ultracold atoms an attractive platform for conducting research on quantum information processing [1,2,3,4] and high-precision instruments [5,6,7,8,9]
We find that the atom incoming from the left channel can experience from blockade to transparency via modifying the onsite energy, tunneling strength, or magnetic flux, which can be potentially used for a quantum switcher
The result may be potentially used for the interface that controls the communication between two individual quantum devices of cold atoms
Summary
The artificial tunability has made ultracold atoms an attractive platform for conducting research on quantum information processing [1,2,3,4] and high-precision instruments [5,6,7,8,9]. We will explore a single-atom quantum switcher and router controlled by the localized artificial magnetic fields that coherently couple two individual atomic channels together, which model is equivalent to a two-leg ladder [50] with only two rungs. The transport properties will be studied for the incident single-atom plane wave with respect to the varying of energy offset and artificial magnetic flux. L to Eq (4), such that the time dependence therein can be removed After this transformation, we obtain the Hamiltonian of the two-rung two-leg ladder penetrated by a localized artificial magnetic flux [see Fig. 1(b)], i.e.,.
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