Research on the Bias Network of Energy-Efficient Single Flux Quantum Circuits

Li, Guanqun; Ren, Jie; Wu, Yu; Ying, Liliang; Niu, Minghui; Chen, Liyun; Wang, Zhen

doi:10.1109/tasc.2019.2910049

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…We replace the bias resistor of the RSFQ cells in the SIMIT Nb03 cell library with the large bias inductor (L > 500 pH) and the overdamped Josephson junction (β C = 0.5) to obtain the ERSFQ cells. Subsequently, we applied the ERSFQ cells to the SQCC design [2,17,18]. Compared to the RSFQ and LV-RSFQ circuits, the ERSFQ circuit requires additional feeding JTL (FJTL) to provide a regulated voltage source for ERSFQ operation.…”

Section: Ersfq Designmentioning

confidence: 99%

“…First, we selected the low-voltage rapid single flux quantum (LV-RSFQ) circuit whose cells are compatible with those in the SIMIT Nb03 RSFQ cell library [15,16]. Then we optimized the design with an energy-efficient rapid single flux quantum (ERSFQ) circuit without static power consumption to further lessen power consumption [2,17,18]. The designed LV-RSFQ and ERSFQ SQCCs were fabricated under the SIMIT-Nb03 process [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Low power single flux quantum qubit control circuit without high-frequency input

Weng

Peng

Ren

2023

Supercond. Sci. Technol.

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The use of high-frequency input signals from room-temperature microwave sources makes it difficult to scale up the number of quantum bits in universal quantum computers. To address this issue, superconducting single flux quantum (SFQ) integrated circuits are being explored as suitable candidates for qubit manipulation in universal quantum computers. This paper deals with a scalable SFQ qubit control circuit (SQCC) structure that requires only low-frequency input. The circuit mainly consists of a pulse generator and a counter, that output the SFQ pulse train with adjustable frequency and a controllable number of pulses, which is applicable to control single-qubit Clifford operations. The design of low-voltage rapid single flux quantum (LV-RSFQ) and Energy-efficient rapid single flux quantum (ERSFQ) for the SQCC achieves low power consumption and provides a basis for scaling up SQCC to control more qubits. The proposed circuits are fabricated under SIMIT-Nb03 process and successfully pass test verification. The achieved test results reveal that the adjustable output frequency ranges of the SQCC based on the LV-RSFQ and ERSFQ designs in order are [2.40, 8.11] GHz and [4.81, 5.14] GHz. In the operating frequency range, the circuit is able to generate the correct number of SFQ pulses under control. The controllable number range is from 1 to 128. When the circuits operate at 5 GHz, the total power consumptions of the above circuits in order are 23.88 μW and 6.2 μW. All input signals are low-frequency signals, which frees the control of large-scale qubits from limitations caused by high-frequency inputs produced by room-temperature microwave sources.

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Section: Ersfq Designmentioning

confidence: 99%