Journal
IEEE SOLID-STATE CIRCUITS LETTERS
Volume 6, Issue -, Pages 185-188Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSSC.2023.3292523
Keywords
Cryogenic current measurement; cryogenic readout; quantum computer (QC); semiconductor spin qubit
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A fully integrated CMOS readout operating at cryogenic temperature for semiconductor spin qubits is developed and tested, which can resolve a variation of the sensing current of 250 pA with a submicrosecond time resolution and a fidelity of 99.86%. Our solution does not require off-chip components and the handling of microwave signals, providing a more compact and reliable readout system.
A fully integrated CMOS readout operating at cryogenic temperature for semiconductor spin qubits is fabricated and characterized. The readout is based on a direct spin-to-digital conversion, consisting of integrating the spin-dependent current from a sensing single-electron transistor and an accurate comparator to provide a 1-bit digital output related to the qubit state. The cryogenic comparator uses floating-gate transistors to obtain a low power, compact, and self-calibrated threshold. The readout can resolve a variation of the sensing current of 250 pA with a submicrosecond time resolution and a fidelity of 99.86% for a total power consumption of 1.2 mW and an occupation area of less than 0.04 mm(2). Compared to the most common RF-reflectometry readout techniques, our solution does not require off-chip components and the handling of microwave signals, paving the way for a more compact and reliable readout system.
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