Suppressing relaxation in superconducting qubits by quasiparticle pumping
Name
1612.08462.pdf
Description
Accepted version
Size
1.42 MB
Format
Adobe PDF
Checksum (MD5)
81a1a2b8d5ce3bdcab4ebb9c57015e22
Author(s)
Gustavsson, Simon
Yan, Fei
Catelani, Gianluigi
Bylander, Jonas
Kamal, Archana
Birenbaum, Jeffrey
Hover, David
Rosenberg, Danna
Samach, Gabriel
Sears, Adam P
Date Issued
2016
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Version
Author's final manuscript
Abstract
Copyright 2016 by the American Association for the Advancement of Science; all rights reserved. Dynamical error suppression techniques are commonly used to improve coherence in quantum systems.They reduce dephasing errors by applying control pulses designed to reverse erroneous coherent evolution driven by environmental noise. However, such methods cannot correct for irreversible processes such as energy relaxation.We investigate a complementary, stochastic approach to reducing errors: Instead of deterministically reversing the unwanted qubit evolution, we use control pulses to shape the noise environment dynamically. In the context of superconducting qubits, we implement a pumping sequence to reduce the number of unpaired electrons (quasiparticles) in close proximity to the device. A 70%reduction in the quasiparticle density results in a threefold enhancement in qubit relaxation times and a comparable reduction in coherence variability.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/SCIENCE.AAH5844
