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Claudia Linnhoff-Popien

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#machine learning Preprint Oct 2026

Same Spectrum, Harder First-Order Training: Phase-Locking in Single- versus Multi-Qubit Re-Uploading Circuits

It is proved that this single-qubit re-uploading (serial) circuit represents every function that a multi-qubit circuit with the same encoding budget with the same encoding budget can; it is found that this exchange of width for depth is not free in first-order training.

Michael Poppel, David Bucher, Maximilian Zorn et al. · 0 citations
Preprint Sep 2026

When Can Quantum Extreme Learning Machines Replace Quantum Reservoirs?

A simple two-qubit reservoir is constructed that performs temporal recall exactly, while every fixed-window predictor faces the same positive worst-case error over unbounded delays, regardless of model capacity.

M. Baumann, Gerhard Stenzel, Jonas Stein et al. · 0 citations
Book Open access Aug 2026

On Representation Smoothness for Robust Architecture Discovery of Variational Quantum Circuits

This work analyzes the effect of encoding discontinuities on diversity-driven discovery and introduces two representation refinements: a smooth, continuous mechanism for gate selection and a factorized representation that separates structural discovery from continuous parameter optimization.

Maximilian Zorn, Jonas Stein, Philipp Altmann et al. · 0 citations
#reinforcement learning Open access Aug 2026

Emergent problem-graph alignment in RL-discovered entanglement topologies for QAOA

In the Quantum Approximate Optimization Algorithm (QAOA), the entanglement topology, where qubit pairs are connected by two-qubit gates, is conventionally set equal to the edge set of the problem graph. This coupling ties circuit design to explicit problem knowledge and may not yield the most trainable circuit under li...

Tobias Rohe, Federico Harjes Ruiloba, Markus Baumann et al. · 0 citations
#machine learning Preprint Sep 2026

Variational Quantum Transformer Architecture for Synthetic Language Generation

We propose a compact NISQ-compatible quantum transformer architecture for synthetic QNLP sequence modelling. The model preserves the autoregressive next-token interface of a classical transformer, but replaces attention and feed-forward sublayers with variational quantum encoder blocks, connector circuits, decoder bloc...

Julian Hager, Michael Kölle, Gerhard Stenzel et al. · 0 citations
Preprint Aug 2026

The Organization of Environmental Coupling Shapes What Quantum Reservoirs Remember

For an open quantum reservoir, how the system forgets is part of how it computes. Quantum reservoir computing processes input streams with fixed quantum dynamics and trains only a linear readout. Dissipation can make old inputs fade, but prior studies commonly fix the environmental process and tune only its strength. H...

M. Baumann, Itamar Fink, Johannes Wittmann et al. · 0 citations
Preprint Aug 2026

Implicit Differentiation for Measurement-Efficient Bilevel Quantum-Classical Optimization

This work proposes a bilevel optimization model for diagonal cost Hamiltonians where coefficients depend on a tunable outer parameter and develops correlator-reuse implicit differentiation (CR-ID), which obtains outer gradients by reusing quantum measurements already collected during inner energy estimation, requiring...

Tobias Rohe, M. Baumann, Federico Harjes Ruiloba et al. · 0 citations

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