Allgemein

Browse all posts in the Allgemein category.

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28MAY 2026
Allgemein
New pre-print “Thermodynamic-limit dispersion relations on trapped-ion quantum hardware”
Computing properties of quantum many-body systems in the thermodynamic limit is of central interest in condensed matter physics, yet classical methods face fundamental limitations for strongly correlated systems. Quantum computers offer a promising way forward, but current devices remain constrained in both qubit number and gate fidelity, restricting direct calculations to small system sizes far […]Computing properties of quantum many-body systems in the thermodynamic limit is of central interest in condensed matter physics, yet classical methods face fundamental limitations for strongly correlated systems. Quantum computers offer a promising way forward, but current devices remain constrained in both qubit number and gate fidelity, restricting direct calculations to small system sizes far […]
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05MAY 2026
Allgemein
New pre-print: “Sample-Based Quantum Diagonalization with Amplitude Amplification”
Recently, sample-based quantum diagonalization (SQD) has emerged as one of the most promising approaches to solve the electronic structure problem on current quantum computers. This method classically diagonalizes a Hamiltonian in a subspace that is spanned by samples obtained from a quantum computer. However, SQD suffers by construction from a fundamental sampling problem, as some […]
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08JAN 2026
Allgemein
New pre-print “Hierarchical divide and conquer quantum approach to combinatorial optimization problems with tunable reduction”
Optimization is one of the areas where quantum computing is expected to change our computational capabilities in a disruptive way. Most industrially relevant combinatorial optimization problems are however too large to fit on current or foreseeable quantum processors. The new preprint, by Mathias Schmid, Naeimeh Mohseni, and Michael J. Hartmann, offers a solution. We propose […]
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18DEC 2025
Allgemein
New pre-print “Ground State Energy via Adiabatic Evolution and Phase Measurement for a Molecular Hamiltonian on an Ion-Trap Quantum Computer”
Ludwig Nützel, alongside Michael J. Hartmann, Henrik Dreyer, and Etienne Granet, have released a new pre-print on the arXiv, titled “Ground State Energy via Adiabatic Evolution and Phase Measurement for a Molecular Hamiltonian on an Ion-Trap Quantum Computer”. In this work, they implement adiabatic state preparation (ASP) and a noise-resilient iterative quantum phase estimation (iQPE) […]
Read more about New pre-print “Ground State Energy via Adiabatic Evolution and Phase Measurement for a Molecular Hamiltonian on an Ion-Trap Quantum Computer”
10DEC 2025
Allgemein
Publication in Quantum Science and Technology: “Cross-talk in superconducting qubit lattices with tunable couplers—comparing transmon and fluxonium architectures”
On December 8th, Quantum Science and Technology published our work on Cross-talk analysis in superconducting qubit architectures: “Cross-talk in superconducting qubit lattices with tunable couplers—comparing transmon and fluxonium architectures”. This work is a collaboration between Florian Lange, Lukas Heunisch, Holger Fehske, David DiVincenzo and Michael Hartmann. We investigate cross-talk effects in an 8-qubit system arranged […]On December 8th, Quantum Science and Technology published our work on Cross-talk analysis in superconducting qubit architectures: “Cross-talk in superconducting qubit lattices with tunable couplers—comparing transmon and fluxonium architectures”. This work is a collaboration between Florian Lange, Lukas Heunisch, Holger Fehske, David DiVincenzo and Michael Hartmann. We investigate cross-talk effects in an 8-qubit system arranged […]
Read more about Publication in Quantum Science and Technology: “Cross-talk in superconducting qubit lattices with tunable couplers—comparing transmon and fluxonium architectures”
08DEC 2025
Allgemein
Publication in Physical Review Research: “Quantum convolutional neural network for phase recognition in two dimensions”
On November 7th, Physical Review Research has published our work which had appeared earlier as a pre-print. This project was jointly realized by Leon C. Sander, Nathan A. McMahon, Petr Zapletal, and Michael J. Hartmann. In this work, we construct a QCNN that can perform phase recognition in two dimensions and correctly identify the phase […]
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