Effects of Laser-Annealing on Fixed-Frequency Superconducting Qubits
- URL: http://arxiv.org/abs/2206.03099v1
- Date: Tue, 7 Jun 2022 08:23:03 GMT
- Title: Effects of Laser-Annealing on Fixed-Frequency Superconducting Qubits
- Authors: Hyunseong Kim, Christian J\"unger, Alexis Morvan, Edward S. Barnard,
William P. Livingston, M. Virginia P. Alto\'e, Yosep Kim, Chengyu Song, Larry
Chen, John Mark Kreikebaum, D. Frank Ogletree, David I. Santiago, Irfan
Siddiqi
- Abstract summary: We present an automated laser-annealing apparatus based on conventional microscopy components.
In one case, we observe a two-fold increase in coherence after laser-annealing.
- Score: 3.6579903484461567
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: As superconducting quantum processors increase in complexity, techniques to
overcome constraints on frequency crowding are needed. The recently developed
method of laser-annealing provides an effective post-fabrication method to
adjust the frequency of superconducting qubits. Here, we present an automated
laser-annealing apparatus based on conventional microscopy components and
demonstrate preservation of highly coherent transmons. In one case, we observe
a two-fold increase in coherence after laser-annealing and perform noise
spectroscopy on this qubit to investigate the change in defect features, in
particular two-level system defects. Finally, we present a local heating model
as well as demonstrate aging stability for laser-annealing on the wafer scale.
Our work constitutes an important first step towards both understanding the
underlying physical mechanism and scaling up laser-annealing of superconducting
qubits.
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