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Effect of Measurement on the Periodicity of the Coulomb Staircase of a Superconducting Box

J. Mannik·J. E. Lukens
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Abstract

We report on the effect of the back-action of a Single Cooper Pair Transistor electrometer (E) on the measurement of charge on the island of a superconducting box (B). The charge is e-periodic in the gate bias of B when E is operated near voltages 2Delta/e or 4Delta/e. We show that this is due to quasiparticle poisoning of B at a rate proportional to the number of quasiparticle tunneling events in E per second. We are able to eliminate this back action and recover 2e charge periodicity using a new measurement method based on switching current modulation of E.

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J. Mannik, J. E. Lukens. 2003-11-06. Effect of Measurement on the Periodicity of the Coulomb Staircase of a Superconducting Box. https://doi.org/10.1103/physrevlett.92.057004

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