Phys. Rev. Lett. 92, 057004 (2004) [4 pages]Effect of Measurement on the Periodicity of the Coulomb Staircase of a Superconducting BoxReceived 14 May 2003; published 5 February 2004 We report on the effect of the backaction of a single Cooper pair transistor electrometer (E) on the charge state of a superconducting box (B). The charge is e periodic in the gate bias of B when E is operated near voltages 2Δ/e or 4Δ/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 backaction and recover 2e-charge periodicity using a new measurement method based on switching-current modulation of E. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.057004
DOI:
10.1103/PhysRevLett.92.057004
PACS:
74.40.+k, 85.25.Hv, 85.35.Gv
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