Theoretical proposal for a broadband on-chip multistage quantum amplifier

Superconductor Science and Technology Pub Date : 2024-07-14 DOI:10.1088/1361-6668/ad44e1

Rutian Huang, Yunfan Shi, Jianshe Liu and Wei Chen

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Abstract

A broadband on-chip multistage quantum amplifier (MQA) for reading out multiple superconducting qubits is proposed. The bandwidth of quantum amplifier is enhanced by concatenating amplifiers with modular nonreciprocal elements, which are superconducting isolators and circulators based on tunable inductor bridge. The circuit model of MQA is built and simulated. The variation of bandwidth, gain and gain-bandwidth product (GBP) of MQA with the number of stages and bandpass of the constitutive amplifiers are simulated. It is revealed that the bandwidth can be as large as ∼3.2 GHz with a gain of 20 dB at 4–8 GHz frequency range. For a 4-stage MQA composed of four quantum amplifiers with 20 dB gain and 0.3 GHz BW-pass, the bandwidth is 2.14 GHz at 20 dB gain, which is quite cost-efficient. Due to its non-reciprocity, MQA can effectively prevent signals from reflecting to quantum processors. In addition, MQA breaks the limitation of GBP and is easy to integrate with superconducting circuits. The MQA would play a crucial role in the high-fidelity readout of multiple qubits in large-scale superconducting quantum computers.

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宽带片上多级量子放大器的理论建议

本文提出了一种用于读出多个超导量子比特的宽带片上多级量子放大器（MQA）。通过将放大器与模块化非互易元件（即基于可调电感桥的超导隔离器和环行器）连接起来，量子放大器的带宽得到了增强。建立并模拟了 MQA 的电路模型。模拟了 MQA 的带宽、增益和增益带宽乘积（GBP）随构成放大器的级数和带通的变化。结果表明，在 4-8 GHz 频率范围内，带宽可高达 ∼ 3.2 GHz，增益为 20 dB。对于由四个增益为 20 dB、BW-pass 为 0.3 GHz 的量子放大器组成的四级 MQA，增益为 20 dB 时的带宽为 2.14 GHz，具有相当高的成本效益。由于其非互易性，MQA 可以有效防止信号反射到量子处理器。此外，MQA 打破了 GBP 的限制，易于与超导电路集成。MQA 将在大规模超导量子计算机的多量子比特高保真读出中发挥重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Superconductor Science and Technology

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