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Quantum Physics
Title: Fast high-fidelity charge readout by operating the cavity-embedded Cooper pair transistor in the Kerr bistable regime
(Submitted on 31 Dec 2022)
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.
Submission history
From: Bhargava Thyagarajan [view email][v1] Sat, 31 Dec 2022 03:44:10 GMT (13777kb,D)
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