Josephson Amplifier for Qubit Readout

Baleegh Abdo; Flavius Schackert; Michael Hatridge; Chad Rigetti; Michel Devoret

doi:10.1063/1.3653473

Josephson Amplifier for Qubit Readout

Superconductivity 2015-05-27 v2 Instrumentation and Detectors Quantum Physics

Authors: Baleegh Abdo , Flavius Schackert , Michael Hatridge , Chad Rigetti , Michel Devoret

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Abstract

We report on measurements of a Josephson amplifier (J-amp) suitable for quantum-state qubit readout in the microwave domain. It consists of two microstrip resonators which intersect at a Josephson ring modulator. A maximum gain of about 20 dB, a bandwidth of 9 MHz, and a center-frequency tunability of about 60 MHz with gain in excess of 10 dB have been attained for idler and signal of frequencies 6.4 GHz and 8.1 GHz, in accordance with theory. Maximum input power measurements of the J-amp show a relatively good agreement with theoretical prediction. We discuss how the amplifier characteristics can be improved.

Keywords

parametric amplifier

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@article{arxiv.1103.1405,
  title  = {Josephson Amplifier for Qubit Readout},
  author = {Baleegh Abdo and Flavius Schackert and Michael Hatridge and Chad Rigetti and Michel Devoret},
  journal= {arXiv preprint arXiv:1103.1405},
  year   = {2015}
}

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9 pages, 4 figures

Josephson Amplifier for Qubit Readout

Abstract

Keywords

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