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Wednesday 2 November 2022 at 11:00-12:00hrs CET
QuTech Colloquium by David DiVincenzo
Title: Transmon platform for quantum computing challnged by chaotic fluctuations
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, considering cases of both 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.

TU Delft, Faculty Applied Sciences
Building 22
Room E (F005)
Lorentzweg 1
2628 CJ Delft

Also possible to join by Zoom
Meeting ID: 811 027 4270
Passcode: 9eN3A2

Previous speakers

Martin van den Brink (ASML)
Klaus Molmer (Aarhus University)

Jelena Vuckovic (Stanford University)
Oliver Dial (IBM)
Jens Eisert (Freie Universität Berlin)

Sae Woo Nam (NIST)
Steven M. Girvin (Yale Quantum Institute, Yale University)
Andrea Morello (University of New South Wales)
Peter Zoller (University of Innsbruck)

Andrew Childs (University of Maryland, QuICS)
Joerg Wrachtrup (Universität Stuttgart)
Reiner Blatt (University of Innsbruck)
Alexandre Blais (Université de Sherbrooke)
Pablo Jarillo-Herrero (MIT)

Nicolas Gisin (University of Geneva)
Christopher Monroe (JQI and University of Maryland)
John Morton (Centre for Nanotechnology)
Matthias Troyer (ETH Zurich)

Renato Renner (ETH Zurich)