The Josephson Bifurcation Amplifier for Quantum Measurements
A new type of amplifier whose primary purpose is the readout of superconducting quantum bits is constructed. 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, bifurcation amplification in nanofabricated Al junctions is demonstrated and the performance predicted by theory is verified.
KeywordsQuantum Measurement Signal Phase Oscillation State Escape Rate Dynamical Switching
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