Fast high-fidelity charge readout by operating the cavity-embedded Cooper pair transistor in the Kerr bistable regime

• URL: http://arxiv.org/abs/2301.00110v1
• Date: Sat, 31 Dec 2022 03:44:10 GMT
• Title: Fast high-fidelity charge readout by operating the cavity-embedded Cooper pair transistor in the Kerr bistable regime
• Authors: Bhargava Thyagarajan, Sisira Kanhirathingal, Benjamin L. Brock, Juliang Li, Miles P. Blencowe and Alexander J. Rimberg
• Abstract summary: We demonstrate single-shot resolution between two charge states that are $0.09e$ apart. The measurement is performed with 94$%$ fidelity in a duration of 3 $mu$s.
• Score: 55.41644538483948
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Operating the cavity-embedded Cooper pair transistor (cCPT) in the Kerr bistable regime, we demonstrate single-shot resolution between two charge states that are $0.09e$ apart. The measurement is performed with 94$\%$ fidelity in a duration of 3 $\mu$s. The drive power at which the measurement is performed corresponds to only 20 intracavity photons on average in the high oscillation amplitude state of the cCPT, which is orders-of-magnitude smaller than that in rf-SETs. We find that the limiting factor for this mode of operation of the cCPT is the spontaneous fluctuation-induced switching between the two metastable oscillation amplitude states. We present empirical data on the variation of the switching dynamics with drive parameters and cCPT DC bias.

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