Journal Article

FZJ-2022-02202

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Transmon platform for quantum computing challenged by chaotic fluctuations

Berke, C. (Corresponding author) ; Varvelis, E. ; Trebst, S. ; Altland, A. ; DiVincenzo, D. P.FZJ*

2022
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/31204  doi:10.1038/s41467-022-29940-y

Abstract: From the perspective of many-body physics, the transmon qubit architectures currently developed for quantum computing are systems of coupled nonlinear quantum resonators. A certain amount of intentional frequency detuning (‘disorder’) is crucially required to protect individual qubit states against the destabilizing effects of nonlinear resonator coupling. Here we investigate the stability of this variant of a many-body localized phase for system parameters relevant to current quantum processors developed by the IBM, Delft, and Google consortia, considering the cases of natural or engineered disorder. Applying three independent diagnostics of localization theory — a Kullback–Leibler analysis of spectral statistics, statistics of many-body wave functions (inverse participation ratios), and a Walsh transform of the many-body spectrum — we find that some of these computing platforms are dangerously close to a phase of uncontrollable chaotic fluctuations.

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Contributing Institute(s):

1. JARA Institut Quanteninformation (PGI-11)
2. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 5224 - Quantum Networking (POF4-522) (POF4-522)

Appears in the scientific report 2022

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