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- W4384643835 abstract "High fidelity qubit readout is critical in order to obtain the thresholds needed to implement quantum error correction protocols and achieve fault-tolerant quantum computing. Large-scale silicon qubit devices will have densely-packed arrays of quantum dots with multiple charge sensors that are, on average, farther away from the quantum dots, entailing a reduction in readout fidelities. Here, we present a readout technique that enhances the readout fidelity in a linear SiMOS 4-dot array by amplifying correlations between a pair of single-electron transistors, known as a twin SET. By recording and subsequently correlating the twin SET traces as we modulate the dot detuning across a charge transition, we demonstrate a reduction in the charge readout infidelity by over one order of magnitude compared to traditional readout methods. We also study the spin-to-charge conversion errors introduced by the modulation technique, and conclude that faster modulation frequencies avoid relaxation-induced errors without introducing significant spin flip errors, favouring the use of the technique at short integration times. This method not only allows for faster and higher fidelity qubit measurements, but it also enhances the signal corresponding to charge transitions that take place farther away from the sensors, enabling a way to circumvent the reduction in readout fidelities in large arrays of qubits." @default.
- W4384643835 created "2023-07-19" @default.
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- W4384643835 date "2023-07-15" @default.
- W4384643835 modified "2023-10-18" @default.
- W4384643835 title "Improved Single-Shot Qubit Readout Using Twin RF-SET Charge Correlations" @default.
- W4384643835 doi "https://doi.org/10.48550/arxiv.2307.07724" @default.
- W4384643835 hasPublicationYear "2023" @default.
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