Readout of a quantum processor with high dynamic range Josephson parametric amplifiers
Author:
White Theodore1ORCID, Opremcak Alex1, Sterling George1ORCID, Korotkov Alexander1, Sank Daniel1ORCID, Acharya Rajeev1, Ansmann Markus1ORCID, Arute Frank1ORCID, Arya Kunal1ORCID, Bardin Joseph C.12, Bengtsson Andreas1ORCID, Bourassa Alexandre1ORCID, Bovaird Jenna1ORCID, Brill Leon1, Buckley Bob B.1, Buell David A.1, Burger Tim1ORCID, Burkett Brian1ORCID, Bushnell Nicholas1, Chen Zijun1, Chiaro Ben1, Cogan Josh1, Collins Roberto1, Crook Alexander L.1ORCID, Curtin Ben1ORCID, Demura Sean1, Dunsworth Andrew1ORCID, Erickson Catherine1ORCID, Fatemi Reza1ORCID, Burgos Leslie Flores1, Forati Ebrahim1, Foxen Brooks1ORCID, Giang William1, Giustina Marissa1ORCID, Grajales Dau Alejandro1ORCID, Hamilton Michael C.13ORCID, Harrington Sean D.1ORCID, Hilton Jeremy1, Hoffmann Markus1ORCID, Hong Sabrina1, Huang Trent1, Huff Ashley1, Iveland Justin1ORCID, Jeffrey Evan1ORCID, Kieferová Mária1ORCID, Kim Seon1ORCID, Klimov Paul V.1ORCID, Kostritsa Fedor1, Kreikebaum John Mark1ORCID, Landhuis David1ORCID, Laptev Pavel1, Laws Lily1, Lee Kenny1, Lester Brian J.1ORCID, Lill Alexander1ORCID, Liu Wayne1, Locharla Aditya1, Lucero Erik1ORCID, McCourt Trevor1ORCID, McEwen Matt14ORCID, Mi Xiao1ORCID, Miao Kevin C.1ORCID, Montazeri Shirin1ORCID, Morvan Alexis1ORCID, Neeley Matthew1ORCID, Neill Charles1, Nersisyan Ani1ORCID, Ng Jiun How1, Nguyen Anthony1ORCID, Nguyen Murray1, Potter Rebecca1, Quintana Chris1, Roushan Pedram1ORCID, Sankaragomathi Kannan1ORCID, Satzinger Kevin J.1ORCID, Schuster Christopher1, Shearn Michael J.1ORCID, Shorter Aaron1, Shvarts Vladimir1, Skruzny Jindra1, Smith W. Clarke1ORCID, Szalay Marco1, Torres Alfredo1, Woo Bryan W. K.1ORCID, Yao Z. Jamie1, Yeh Ping1, Yoo Juhwan1, Young Grayson1, Zhu Ningfeng1ORCID, Zobrist Nicholas1ORCID, Chen Yu1, Megrant Anthony1, Kelly Julian1, Naaman Ofer1ORCID
Affiliation:
1. Google Quantum AI 1 , Goleta, California 93117, USA 2. Department of Electrical and Computer Engineering, University of Massachusetts 2 , Amherst Massachusetts 01003, USA 3. Department of Electrical and Computer Engineering, Auburn University 3 , Auburn, Alabama 36849, USA 4. Department of Physics, University of California 4 , Santa Barbara, California 93106, USA
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 Ω 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 estimation 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. Finally, 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.
Subject
Physics and Astronomy (miscellaneous)
Cited by
17 articles.
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