Readout of a quantum processor with high dynamic range Josephson
parametric amplifiers
- URL: http://arxiv.org/abs/2209.07757v2
- Date: Wed, 23 Nov 2022 00:22:11 GMT
- Title: Readout of a quantum processor with high dynamic range Josephson
parametric amplifiers
- Authors: T.C. White, Alex Opremcak, George Sterling, Alexander Korotkov, Daniel
Sank, Rajeev Acharya, Markus Ansmann, Frank Arute, Kunal Arya, Joseph C.
Bardin, Andreas Bengtsson, Alexandre Bourassa, Jenna Bovaird, Leon Brill, Bob
B. Buckley, David A. Buell, Tim Burger, Brian Burkett, Nicholas Bushnell,
Zijun Chen, Ben Chiaro, Josh Cogan, Roberto Collins, Alexander L. Crook, Ben
Curtin, Sean Demura, Andrew Dunsworth, Catherine Erickson, Reza Fatemi,
Leslie Flores-Burgos, Ebrahim Forati, Brooks Foxen, William Giang, Marissa
Giustina, Alejandro Grajales Dau, Michael C. Hamilton, Sean D. Harrington,
Jeremy Hilton, Markus Hoffmann, Sabrina Hong, Trent Huang, Ashley Huff,
Justin Iveland, Evan Jeffrey, M\'arika Kieferov\'a, Seon Kim, Paul V. Klimov,
Fedor Kostritsa, John Mark Kreikebaum, David Landhuis, Pavel Laptev, Lily
Laws, Kenny Lee, Brian J. Lester, Alexander Lill, Wayne Liu, Aditya Locharla,
Erik Lucero, Trevor McCourt, Matt McEwen, Xiao Mi, Kevin C. Miao, Shirin
Montazeri, Alexis Morvan, Matthew Neeley, Charles Neill, Ani Nersisyan, Jiun
How Ng, Anthony Nguyen, Murray Nguyen, Rebecca Potter, Chris Quintana, Pedram
Roushan, Kannan Sankaragomathi, Kevin J. Satzinger, Christopher Schuster,
Michael J. Shearn, Aaron Shorter, Vladimir Shvarts, Jindra Skruzny, W. Clarke
Smith, Marco Szalay, Alfredo Torres, Bryan Woo, Z. Jamie Yao, Ping Yeh,
Juhwan Yoo, Grayson Young, Ningfeng Zhu, Nicholas Zobrist, Yu Chen, Anthony
Megrant, Julian Kelly, Ofer Naaman
- Abstract summary: Device is matched to the 50 $Omega$ environment with 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.
Design has no adverse effect on system noise, readout fidelity, or qubit dephasing.
- Score: 132.67289832617647
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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 $\Omega$ 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.
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