TY  - JOUR
AU  - Gustavsson, S.
AU  - Yan, F.
AU  - Catelani, G.
AU  - Bylander, J.
AU  - Kamal, A.
AU  - Birenbaum, J.
AU  - Hover, D.
AU  - Rosenberg, D.
AU  - Samach, G.
AU  - Sears, A. P.
AU  - Weber, S. J.
AU  - Yoder, J. L.
AU  - Clarke, J.
AU  - Kerman, A. J.
AU  - Yoshihara, F.
AU  - Nakamura, Y.
AU  - Orlando, T. P.
AU  - Oliver, W. D.
TI  - Suppressing relaxation in superconducting qubits by quasiparticle pumping
JO  - Science
VL  - 354
IS  - 6319
SN  - 1095-9203
CY  - Washington, DC [u.a.]
PB  - American Association for the Advancement of Science64196
M1  - FZJ-2017-00018
SP  - 1573 - 1577
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000390254300049
C6  - pmid:27940578
DO  - DOI:10.1126/science.aah5844
UR  - https://juser.fz-juelich.de/record/825701
ER  -