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arXiv 2304.00799quant-phcond-mat.supr-con
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微波量子二极管

Microwave quantum diode

Rishabh Upadhyay, Dmitry S. Golubev, Yu-Cheng Chang, George Thomas, Andrew Guthrie, Joonas T. Peltonen, Jukka P. Pekola

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13 pages, 8 figures
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AI总结：

本文提出一种利用超导磁通量子比特非线性的紧凑微波量子二极管，实验实现高传输整流比，可支持多读出通道扩展。

摘要：

量子电路的脆弱特性是可扩展量子应用的主要瓶颈。量子电路在低温温度下运行，极易受到放大器反作用和外部噪声的影响。环形器和隔离器等非互易微波器件被用于这一目的。这些器件在低温恒温器中占据相当大的空间，限制了量子电路的可扩展性。我们提出一种紧凑的微波二极管架构，该架构利用超导磁通量子比特的非线性。在量子比特简并点，我们通过实验证明了相反方向传输的功率水平之间存在显著差异。观测结果与所提出的理论模型一致。在 -99 dBm 输入功率下，并在量子比特-谐振器避免交叉区域附近，我们报告在从 6.81 GHz 到 6.86 GHz 的 50 MHz 宽频率范围内，传输整流比超过 90%；在从 6.67 GHz 到 6.91 GHz 的 250 MHz 范围内，传输整流比超过 60%。所提出的架构结构紧凑，并且易于向多个读出通道扩展，有望为量子信息、微波读出和光力学领域带来多种机遇。

英文摘要：

The fragile nature of quantum circuits is a major bottleneck to scalable quantum applications. Operating at cryogenic temperatures, quantum circuits are highly vulnerable to amplifier backaction and external noise. Non-reciprocal microwave devices such as circulators and isolators are used for this purpose. These devices have a considerable footprint in cryostats, limiting the scalability of quantum circuits. We present a compact microwave diode architecture, which exploits the non-linearity of a superconducting flux qubit. At the qubit degeneracy point we experimentally demonstrate a significant difference between the power levels transmitted in opposite directions. The observations align with the proposed theoretical model. At -99 dBm input power, and near the qubit-resonator avoided crossing region, we report the transmission rectification ratio exceeding 90% for a 50 MHz wide frequency range from 6.81 GHz to 6.86 GHz, and over 60% for the 250 MHz range from 6.67 GHz to 6.91 GHz. The presented architecture is compact, and easily scalable towards multiple readout channels, potentially opening up diverse opportunities in quantum information, microwave read-out and optomechanics.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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