Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

• URL: http://arxiv.org/abs/2009.00781v4
• Date: Wed, 23 Sep 2020 14:31:05 GMT
• Title: Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
• Authors: Jared B. Hertzberg, Eric J. Zhang, Sami Rosenblatt, Easwar Magesan, John A. Smolin, Jeng-Bang Yau, Vivekananda P. Adiga, Martin Sandberg, Markus Brink, Jerry M. Chow, Jason S. Orcutt
• Abstract summary: We show a nearly ten-fold improvement in the precision of setting qubit frequencies. We identify the types of 'frequency collisions' that will impair a transmon qubit and cross-resonance gate architecture. We find that without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0.
• Score: 4.522152274205814
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly ten-fold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of 'frequency collisions' that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.

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