Readout of a quantum processor with high dynamic range Josephson parametric amplifiers
Abstract
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device is matched to the 50 environment with a Klopfenstein-taper impedance transformer and achieves a bandwidth of 250-300 MHz, with input saturation powers up to -95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used to benchmark these devices, providing a calibration for readout power, an estimate of amplifier added noise, and a platform for comparison against standard impedance matched parametric amplifiers with a single dc-SQUID. We find that the high power rf-SQUID array design has no adverse effect on system noise, readout fidelity, or qubit dephasing, and we estimate an upper bound on amplifier added noise at 1.6 times the quantum limit. Lastly, amplifiers with this design show no degradation in readout fidelity due to gain compression, which can occur in multi-tone multiplexed readout with traditional JPAs.
Keywords
Cite
@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}
}
Comments
10 pages, 10 figures