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Bulletin of the American Physical Society

Near quantum limited amplification from inelastic Cooper-pair tunneling

M. Hofheinz, Salha Jebari, Florian Blanchet, Alexander Grimm, Dibyendu Hazra, Romain Albert, F. Portier

Published Mar 14, 2017• 0 citations
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We experimentally show that the inelastic cooper-pair tunneling amplifier (ICTA), implementing a DC-powered parametric amplification scheme, can achieve gain and noise performance similar to that of AC-powered Josephson parametric amplifiers. Using experimental data and simulations, we show that the ICTA has near-quantum-limited noise as long as low-frequency voltage noise, expressed as broadening of the Josephson frequency line, is narrower than the amplification bandwidth. We observe a gain of 20 dB across a 11 MHz bandwidth with noise below 1.7 times the quantum limit when the full width at half maximum of the Josephson frequency linewidth is 5.6 MHz.