Qubit dispersive readout scheme with a microstrip superconducting quantum interference device amplifier

Michotte, Sébastien
(2009) Applied Physics Letters — Vol. 94, n° 12 (2009)

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  • Michotte, SébastienUCLouvain
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Abstract
A flux qubit readout scheme involving a dispersive technique coupled to a microstrip superconducting quantum interference device (SQUID) amplifier has been tested experimentally. Thanks to the almost quantum limited noise of this amplifier at low temperature, this readout device is very promising for a design with actual qubits. Its proof of principle and low noise performance have been tested by simulating the qubit presence by applying a tiny flux change in the input SQUID. The resonant frequency of the amplifier is adjusted in situ with a varactor diode to approach the frequency of the tank circuit. Two operating modes (crossing or anticrossing regime) were identified.
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Michotte, S. (2009). Qubit dispersive readout scheme with a microstrip superconducting quantum interference device amplifier. Applied Physics Letters, 94(12). https://doi.org/10.1063/1.3109793 (Original work published 2009)