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

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

2003-05-08

arxiv.org/abs/cond-mat/0305190v2

Phys. Rev. Lett. 92, 057004 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, revised version

Scientific paper

10.1103/PhysRevLett.92.057004

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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