使用高动态范围约瑟夫森参量放大器读取量子处理器
量子物理
2023-01-04 v2 超导电性
应用物理
摘要
我们展示了一种高动态范围约瑟夫森参量放大器（JPA），其有源非线性元件由 rf-SQUID 阵列实现。该器件通过 Klopfenstein 锥形阻抗变换器匹配至 50 Ω 环境，实现了 250–300 MHz 带宽，在 20 dB 增益下输入饱和功率高达 -95 dBm。我们使用 54 量子比特 Sycamore 处理器对这些器件进行基准测试，提供了读取功率的校准、放大器附加噪声的估计，以及与采用单个 dc-SQUID 的标准阻抗匹配参量放大器进行比较的平台。我们发现高功率 rf-SQUID 阵列设计对系统噪声、读取保真度或量子比特退相干均无不利影响，并估计放大器附加噪声的上界为量子极限的 1.6 倍。最后，采用该设计的放大器在读取保真度上未因增益压缩而退化，而增益压缩在传统 JPA 的多音复用读取中可能出现。
引用
@article{arxiv.2209.07757,
title = {Readout of a quantum processor with high dynamic range Josephson parametric amplifiers},
author = {T. C. White and Alex Opremcak and George Sterling and Alexander Korotkov and Daniel Sank and Rajeev Acharya and Markus Ansmann and Frank Arute and Kunal Arya and Joseph C. Bardin and Andreas Bengtsson and Alexandre Bourassa and Jenna Bovaird and Leon Brill and Bob B. Buckley and David A. Buell and Tim Burger and Brian Burkett and Nicholas Bushnell and Zijun Chen and Ben Chiaro and Josh Cogan and Roberto Collins and Alexander L. Crook and Ben Curtin and Sean Demura and Andrew Dunsworth and Catherine Erickson and Reza Fatemi and Leslie Flores-Burgos and Ebrahim Forati and Brooks Foxen and William Giang and Marissa Giustina and Alejandro Grajales Dau and Michael C. Hamilton and Sean D. Harrington and Jeremy Hilton and Markus Hoffmann and Sabrina Hong and Trent Huang and Ashley Huff and Justin Iveland and Evan Jeffrey and Márika Kieferová and Seon Kim and Paul V. Klimov and Fedor Kostritsa and John Mark Kreikebaum and David Landhuis and Pavel Laptev and Lily Laws and Kenny Lee and Brian J. Lester and Alexander Lill and Wayne Liu and Aditya Locharla and Erik Lucero and Trevor McCourt and Matt McEwen and Xiao Mi and Kevin C. Miao and Shirin Montazeri and Alexis Morvan and Matthew Neeley and Charles Neill and Ani Nersisyan and Jiun How Ng and Anthony Nguyen and Murray Nguyen and Rebecca Potter and Chris Quintana and Pedram Roushan and Kannan Sankaragomathi and Kevin J. Satzinger and Christopher Schuster and Michael J. Shearn and Aaron Shorter and Vladimir Shvarts and Jindra Skruzny and W. Clarke Smith and Marco Szalay and Alfredo Torres and Bryan Woo and Z. Jamie Yao and Ping Yeh and Juhwan Yoo and Grayson Young and Ningfeng Zhu and Nicholas Zobrist and Yu Chen and Anthony Megrant and Julian Kelly and Ofer Naaman},
journal= {arXiv preprint arXiv:2209.07757},
year = {2023}
}
备注
10 pages, 10 figures