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Readout strength dependence of state projection in superconducting qubit

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arxiv 1004.0182 v2 pith:K3IYSOMA submitted 2010-04-01 cond-mat.supr-con

Readout strength dependence of state projection in superconducting qubit

K. Kakuyanagi , H. Nakano , S. Kagei , R. Koibuchi , S. Saito , A. Lupascu , K. Semba This is my paper
classification cond-mat.supr-con
keywords readoutprojectionstrengthmeasurementprocesspulsequbitstate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have controlled the measurement strength of the qubit readout process by using a Josephson bifurcation amplifier (JBA : an AC-driven SQUID). The optimum readout pulse changes the superposition state into an eigenstate. To clarify how a sufficiently strong measurement causes a projection phenomenon, we have studied the projection conditions in the JBA readout. We found that the projection occurs above the pulse height at which visibility starts to appear. Furthermore, the projection continues to occur as readout strength increases, even though the visibility vanishes. This result helps us understanding the JBA readout process.

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