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Title: Whispering galleries and the control of artificial atoms
Authors: Forrester, Michael
Kusmartsev, F.V.
Issue Date: 2016
Publisher: © The Authors. Published by Nature Publishing Group
Citation: FORRESTER, D.M. and KUSMARTSEV, F.V., 2016. Whispering galleries and the control of artificial atoms. Scientific Reports, 6: 25084.
Abstract: Quantum computation using artificial-atoms, such as novel superconducting circuits, can be sensitively controlled by external electromagnetic fields. These fields and the self-fields attributable to the coupled artificial-atoms influence the amount of quantum correlation in the system. However, control elements that can operate without complete destruction of the entanglement of the quantum-bits are difficult to engineer. Here we investigate the possibility of using closely-spaced-linear arrays of metallic-elliptical discs as whispering gallery waveguides to control artificial-atoms. The discs confine and guide radiation through the array with small notches etched into their sides that act as scatterers. We focus on Ï €-ring artificial-atoms, which can generate their own spontaneous fluxes. We find that the micro-discs of the waveguides can be excited by terahertz frequency fields to exhibit whispering-modes and that a quantum-phase-gate composed of Ï €-rings can be operated under their influence. Furthermore, we gauge the level of entanglement through the concurrence measure and show that under certain magnetic conditions a series of entanglement sudden-deaths and revivals occur between the two qubits. This is important for understanding the stability and life-time of qubit operations using, for example, a phase gate in a hybrid of quantum technologies composed of control elements and artificial-atoms.
Description: This is an Open Access Article. It is published by Nature Publishing under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work has been supported by the European Science Foundation (ESF) in the framework of the network program “Arrays of Quantum Dots and Josephson Junctions” and the EPSRC KTA grant - “Developing prototypes and a commercial strategy for nanoblade Technology”.
Version: Published
DOI: 10.1038/srep25084
URI: https://dspace.lboro.ac.uk/2134/21260
Publisher Link: http://dx.doi.org/10.1038/srep25084
Appears in Collections:Published Articles (Physics)
Published Articles (Chemical Engineering)

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