Journal Article

FZJ-2017-00018

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Suppressing relaxation in superconducting qubits by quasiparticle pumping

Gustavsson, S. (Corresponding author) ; Yan, F. ; Catelani, G.FZJ* ; Bylander, J. ; Kamal, A. ; Birenbaum, J. ; Hover, D. ; Rosenberg, D. ; Samach, G. ; Sears, A. P. ; Weber, S. J. ; Yoder, J. L. ; Clarke, J. ; Kerman, A. J. ; Yoshihara, F. ; Nakamura, Y. ; Orlando, T. P. ; Oliver, W. D.

2016
American Association for the Advancement of Science64196 Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/science.aah5844

Abstract: 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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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)

Appears in the scientific report 2016

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