Sample and hold strategy for quantum measurements of Josephson charge qubits
V. Schöllmann, P. Ågren, D. B. Haviland, T. H. Hansson, A. Karlhede
DOI 10.1103/PhysRevB.65.020505 · Physical Review B
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Abstract
We present a design for a charge qubit, and an associated “quantum sample and hold” measurement scheme. Using arrays of superconducting islands, connected by tunable tunnel junctions, we can “sample” the charge states by turning off the Josephson coupling, and then “hold” a Cooper pair on an island for a very long time. This allows for a slow readout using a conventional weakly coupled low-frequency single-electron transistor.
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