Suppressing relaxation in superconducting qubits by quasiparticle pumping
Artikel i vetenskaplig tidskrift, 2016

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.
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Publicerad i

Science

00368075 (ISSN) 10959203 (eISSN)

Vol. 354 Nummer/häfte 6319 s. 1573-1577

Kategorisering

Ämneskategorier (SSIF 2011)

Nanoteknik

Den kondenserade materiens fysik

Identifikatorer

DOI

10.1126/science.aah5844

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Senast uppdaterat

2018-06-19