Fast Gate-Based Readout of Silicon Quantum Dots Using Josephson Parametric Amplification.,Physical Review Letters

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Fast Gate-Based Readout of Silicon Quantum Dots Using Josephson Parametric Amplification.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-02-14 , DOI: 10.1103/physrevlett.124.067701
S Schaal ₁ , I Ahmed ₂ , J A Haigh ₃ , L Hutin ₄ , B Bertrand ₄ , S Barraud ₄ , M Vinet ₄ , C-M Lee ₅ , N Stelmashenko ₅ , J W A Robinson ₅ , J Y Qiu ₆ , S Hacohen-Gourgy ₆ , I Siddiqi ₆ , M F Gonzalez-Zalba ₃ , J J L Morton _{1,

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Affiliation

Spins in silicon quantum devices are promising candidates for large-scale quantum computing. Gate-based sensing of spin qubits offers a compact and scalable readout with high fidelity, however, further improvements in sensitivity are required to meet the fidelity thresholds and measurement timescales needed for the implementation of fast feedback in error correction protocols. Here, we combine radio-frequency gate-based sensing at 622 MHz with a Josephson parametric amplifier, that operates in the 500-800 MHz band, to reduce the integration time required to read the state of a silicon double quantum dot formed in a nanowire transistor. Based on our achieved signal-to-noise ratio, we estimate that singlet-triplet single-shot readout with an average fidelity of 99.7% could be performed in 1 μs, well below the requirements for fault-tolerant readout and 30 times faster than without the Josephson parametric amplifier. Additionally, the Josephson parametric amplifier allows operation at a lower radio-frequency power while maintaining identical signal-to-noise ratio. We determine a noise temperature of 200 mK with a contribution from the Josephson parametric amplifier (25%), cryogenic amplifier (25%) and the resonator (50%), showing routes to further increase the readout speed.

中文翻译：

使用约瑟夫森参数放大技术快速基于栅极的硅量子点读数。

硅量子器件中的自旋是大规模量子计算的有希望的候选者。基于门的自旋量子位感测提供了具有高保真度的紧凑且可扩展的读数，但是，需要进一步提高灵敏度才能满足在纠错协议中实现快速反馈所需的保真度阈值和测量时标。在这里，我们将622 MHz的基于射频门的感应与可在500-800 MHz频段工作的Josephson参数放大器相结合，以减少读取纳米线中形成的硅双量子点状态所需的积分时间晶体管。根据我们获得的信噪比，我们估计可以在1μs内执行平均三重峰单次读出的平均保真度为99.7％，远低于容错读出的要求，并且比没有约瑟夫森参数放大器的速度快30倍。另外，约瑟夫森参数放大器允许在较低的射频功率下工作，同时保持相同的信噪比。我们确定约200 mK的噪声温度，这归因于约瑟夫森参数放大器（25％），低温放大器（25％）和谐振器（50％），显示了进一步提高读出速度的途径。

更新日期：2020-02-14

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