Characterizing and Optimizing Qubit Coherence Based on SQUID Geometry
Jochen Braumüller, Leon Ding, Antti P. Vepsäläinen, Youngkyu Sung, Morten Kjaergaard, Tim Menke, Roni Winik, David Kim, Bethany M. Niedzielski, Alexander Melville, Jonilyn L. Yoder, Cyrus F. Hirjibehedin, Terry P. Orlando, Simon Gustavsson, William D. Oliver
DOI 10.1103/PhysRevApplied.13.054079 · Physical Review Applied
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Abstract
The dominant source of decoherence in contemporary frequency-tunable superconducting qubits is 1/f flux noise. To understand its origin and find ways to minimize its impact, we systematically study flux noise amplitudes in more than 50 flux qubits with varied superconducting quantum interference device (SQUID) geometry parameters and compare our results to a microscopic model of magnetic spin defects located at the interfaces surrounding the SQUID loops. Our data are in agreement with an extension of the previously proposed model, based on numerical simulations of the current distribution in the investigated SQUIDs. Our results and detailed model provide a guide for minimizing the flux noise susceptibility in future circuits.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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