The Josephson Bifurcation Amplifier for Quantum Measurements

Details The Josephson Bifurcation Amplifier for Quantum Measurements The Josephson Bifurcation Amplifier for Quantum Measurements

2005-07-11

arxiv.org/abs/cond-mat/0507248v1

Physics

Condensed Matter

Superconductivity

To be published in the proceedings of the 2004 MQC2 conference

Scientific paper

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 an 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 back-action, and the absence of on-chip dissipation. Using pulsed microwave techniques, we demonstrate bifurcation amplification in nanofabricated Al junctions and verify that the performance predicted by theory is attained.

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