Toroidal qubits: naturally-decoupled quiet artificial atoms
journal contributionposted on 17.12.2015 by Alexandre Zagoskin, Arkadi Chipouline, E. Il’ichev, J. Robert Johansson, Franco Nori
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The requirements of quantum computations impose high demands on the level of qubit protection from perturbations; in particular, from those produced by the environment. Here we propose a superconducting flux qubit design that is naturally protected from ambient noise. This decoupling is due to the qubit interacting with the electromagnetic field only through its toroidal moment, which provides an unusual qubit-field interaction, which is suppressed at low frequencies.
A.Z. was supported in part by the EPSRC grant EP/M006581/1 and by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUSTMISiS(No. K2-2014-015). A.C. acknowledges financial support by the Federal Ministry of Education and Research in the frame of a PhoNa Project. E.I. acknowledges funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under Grant No. 270843 (iQIT)