Fast readout of a single Cooper-pair box using its quantum capacitance

Details Fast readout of a single Cooper-pair box using its quantum capacitance Fast readout of a single Cooper-pair box using its quantum capacitance

2010-04-19

arxiv.org/abs/1004.3279v1

Phys. Rev. B 82, 134533 (2010)

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.134533

We have fabricated a single Cooper-pair box (SCB) together with an on-chip lumped element resonator. By utilizing the quantum capacitance of the SCB, its state can be read out by detecting the phase of a radio-frequency (rf) signal reflected off the resonator. The resonator was optimized for fast readout. By studying quasiparticle tunneling events in the SCB, we have characterized the performance of the readout and found that we can perform a single shot parity measurement in approximately 50 ns. This is an order of magnitude faster than previously reported measurements.

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