RF-driven Josephson bifurcation amplifier for quantum measurement

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...

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Bibliographic Details
Published in:Physical review letters 2004-11, Vol.93 (20), p.207002.1-207002.4, Article 207002
Main Authors: SIDDIQI, I, VIJAY, R, PIERRE, F, WILSON, C. M, METCALFE, M, RIGETTI, C, FRUNZIO, L, DEVORET, M. H
Format: Article
Language:English
Subjects:
Applied sciences
Condensed Matter
Electronics
Exact sciences and technology
Mesoscopic Systems and Quantum Hall Effect
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.207002