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Whispering galleries and the control of artificial atoms

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posted on 17.05.2016 by Derek Michael Forrester, Feodor Kusmartsev
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.

Funding

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”.

History

School

  • Science

Department

  • Physics

Published in

Scientific Reports

Volume

6

Citation

FORRESTER, D.M. and KUSMARTSEV, F.V., 2016. Whispering galleries and the control of artificial atoms. Scientific Reports, 6: 25084.

Publisher

© The Authors. Published by Nature Publishing Group

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VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2016

Notes

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/

eISSN

2045-2322

Language

en

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