Measuring the Decoherence of a Quantronium Qubit with the Cavity Bifurcation Amplifier - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: Dispersive readouts for superconducting qubits have the advantage of speedand minimal invasiveness. We have developed such an amplifier, the CavityBifurcation Amplifier CBA 10, and applied it to the readout of thequantronium qubit 2. It consists of a Josephson junction embedded in amicrowave on-chip resonator. In contrast with the Josephson bifurcationamplifier 17, which has an on-chip capacitor shunting a junction, theresonator is based on a simple coplanar waveguide imposing a pre-determinedfrequency and whose other RF characteristics like the quality factor are easilycontrolled and optimized. Under proper microwave irradiation conditions, theCBA has two metastable states. Which state is adopted by the CBA depends on thestate of a quantronium qubit coupled to the CBA-s junction. Due to the MHzrepetition rate and large signal to noise ratio we can show directly that thecoherence is limited by 1-f gate charge noise when biased at the sweet spot - apoint insensitive to first order gate charge fluctuations. This architecturelends itself to scalable quantum computing using a multi-resonator chip withmultiplexed readouts.



Autor: M. Metcalfe, E. Boaknin, V. Manucharyan, R. Vijay, I. Siddiqi, C. Rigetti, L. Frunzio, R. J. Schoelkopf, M. H. Devoret

Fuente: https://arxiv.org/



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