Publication

A major bottleneck of current NISQ hardware is low fidelity of 2 qubit gates. A component to improve this is the possibility to completely switch off interactions between qubits. In our pre-print we derive conditions for the coupler to suppress all parasitic interactions, i.e. state delocalization a...

In our latest pre-print, we introduce a variational algorithm for Hamiltonian simulation. As quantum optimization faces fundamental problem when performed on a quantum machine, we studied optimization on a classical computer. As opposed to prior work, the presented algorithm is applicable to any loc...

Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger, Zoë Holmes Quantum systems subject to periodic driving exhibit a diverse set of phenomena both of fundamental and technological interest. However, such dynamical systems are mor...

IOPscience's Quantum Science and Technology has accepted and published a new article by Refik Mansuroglu, Timo Eckstein, Ludwig Nützel, Samuel A Wilkinson, and Michael J Hartmann, which introduces a novel technique to efficiently scale variational quantum algorithms to larger systems. The article ca...

The paper “Variational Quantum Eigensolver Ansatz for the J1-J2-model”, a work of our PhD candidate Verena Feulner, was published in Physical Review B. The J1-J2 quantum spin model goes one step beyond a nearest-neighbor interacting system by introducing next-nearest neighbor interactions along t...

The iX magazine, a well-established format by the German Heise publishing company for a professional IT audience, was putting together a comprehensive introduction on quantum computing from a practical computing perspective as a special edition. It was release on 10th June 2021 (https://www.heise.de...

The paper "Quantum approximate optimization of non-planar graph problems on a planar superconducting processor", on which Michael Streif, a PhD candidate in the Michael J Hartmann theory group, is a co-author, was published in Nature Physics. In this work, Google’s Sycamore quantum processor was ...

A new Publication by Michael J. Hartmann and Frank Deppe in the german journal "Physik in unserer Zeit" introducing Google Quantum AI's Sycamore quantum processor.

New publication together with Google AI Quantum team and collaborators: "Quantum supremacy using a programmable superconducting processor” now published in Nature , see https://www.nature.com/articles/s41586-019-1666-5 For coverage, see also: Google AI blog by John Martinis and Sergio Boixo ...