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We have controlled the measurement strength of the qubit readout process byusing a Josephson bifurcation amplifier (JBA : an AC-driven SQUID). The optimumreadout pulse changes the superposition state into an eigenstate. To clarifyhow a sufficiently strong measurement causes a projection phenomenon, we havestudied the projection conditions in the JBA readout. We found that theprojection 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 JBAreadout process.

Readout strength dependence of state projection in superconducting qubit