Probing Majorana edge states with a flux qubit

A pair of counter-propagating Majorana edge modes appears in chiral p-wave superconductors and in other superconducting systems belonging to the same universality class. These modes can be described by an Ising conformal field theory. We show how a superconducting flux qubit attached to such a system couples to the two chiral edge modes via the disorder field of the Ising model. Due to this coupling, measuring the back-action of the edge states on the qubit allows to probe the properties of Majorana edge modes.

74.20.Mn
73.23.-b
74.50.+r
superconductivity
fermion: Majorana
propagator: correction
vortex: excited state
energy: renormalization
correlation function
flux

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