RF-driven Josephson bifurcation amplifier for quantum measurement |
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Authors: | Siddiqi I Vijay R Pierre F Wilson C M Metcalfe M Rigetti C Frunzio L Devoret M H |
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Affiliation: | Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520-8284, USA. |
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Abstract: | We have constructed a new type of amplifier whose primary purpose is the readout of superconducting quantum bits. It is based on the transition of a rf-driven Josephson junction between two distinct oscillation states near a dynamical bifurcation point. The main advantages of this new amplifier are speed, high sensitivity, low backaction, and the absence of on-chip dissipation. Pulsed microwave reflection measurements on nanofabricated Al junctions show that actual devices attain the performance predicted by theory. |
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