TY  - JOUR
AU  - Berke, Christoph
AU  - Varvelis, Evangelos
AU  - Trebst, Simon
AU  - Altland, Alexander
AU  - DiVincenzo, David P.
TI  - Transmon platform for quantum computing challenged by chaotic fluctuations
JO  - Nature Communications
VL  - 13
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - FZJ-2022-02202
SP  - 2495
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:35523783
UR  - <Go to ISI:>//WOS:000791826000025
DO  - DOI:10.1038/s41467-022-29940-y
UR  - https://juser.fz-juelich.de/record/907773
ER  -