Speaker
Marios Samiotis
(QuTech & Kavli Institute of Nanoscience, Delft University of Technology)
Description
We investigate qubit error bursts in 5- and 7-transmon processors of similar design, fabrication and packaging, but with different types of qubit Josephson junctions. The duration and rate of bursts are device specific but within the range of prior experiments and consistent with ionizing radiation. We observe two unforeseen signatures specifically in the processor with Dolan junctions. First, increasing the rate of π pulsing in the detection scheme shortens the recovery time to equilibrium, which is explained by a quasiparticle pumping mechanism. The second signature is an anomalous time dependence in the burst rate: a surge happens days or weeks after cooldown, followed by a strong suppression that persists until thermal cycling.
Authors
Marios Samiotis
(QuTech & Kavli Institute of Nanoscience, Delft University of Technology)
Giuseppe Ruggero Di Carlo
(QuTech and Kavli Institute of Nanoscience, Delft University of Technology)
Co-authors
Anand Kamlapure
(QuTech and Kavli Institute of Nanoscience, Delft University of Technology)
Matvey Finkel
(QuTech and Kavli Institute of Nanoscience, Delft University of Technology)
Nandini Muthusubramanian
(AWS Center for Quantum Computing, California Institute of Technology)
Marc W. Beekman
(Netherlands Organisation for Applied Scientific Research (TNO))
Nadia Haider
(QuTech and Faculty of Electrical Engineering, Mathematics, and Computer Science, Delft University of Technology)
Miguel S. Moreira
(Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology)
Jorge F. Marques
(AWS Center for Quantum Computing, California Institute of Technology)
Bart Segers
(Quantware B.V.)
Santiago Vallés-Sanclemente
(QuTech and Kavli Institute of Nanoscience, Delft University of Technology)
Leonardo DiCarlo
(QuTech and Kavli Institute of Nanoscience, Delft University of Technology)
