Universität Ulm

Evaluating Sample-Based Krylov Quantum Diagonalization for Heisenberg Models with Applications to Materials Science

Roman Firt, Neel Misciasci, Jonathan E. Mueller +4

We evaluate the Sample-based Krylov Quantum Diagonalization (SKQD) algorithm on one- and two-dimensional Heisenberg models, including strongly correlated regimes in which the groun…

Quantum Coherence in Superconducting Vortex States

Ameya Nambisan, Simon Günzler, Dennis Rieger +13

Abrikosov vortices, where the superconducting gap is completely suppressed in the core, are dissipative, semi-classical entities that impact applications from high-current-density…

Approaching the scaling limit of transport through lattices with dephasing

Subhajit Sarkar, Gabriela Wójtowicz, Bartłomiej Gardas +2

We examine the stationary--state equations for lattices with generalized Markovian dephasing and relaxation. When the Hamiltonian is quadratic, the single--particle correlation mat…

FewBodyToolkit.jl: a Julia package for solving quantum few-body problems

Lucas Happ

Few-body physics explores quantum systems of a small number of particles, bridging the gap between single-particle and many-body regimes. To provide an accessible tool for such stu…

PHIP Sequences and Dipolar Fields

Martin C. Korzeczek, Ilai Schwartz, Martin B. Plenio

Para-hydrogen induced polarization (PHIP) achieves efficient hyperpolarisation of nuclear spins with the transfer of the singlet order of parahydrogen to target molecules through c…

Hybrid quantum tensor networks for aeroelastic applications

M. Lautaro Hickmann, Pedro Alves, David Quero +2

We investigate the application of hybrid quantum tensor networks to aeroelastic problems, harnessing the power of Quantum Machine Learning (QML). By combining tensor networks with…

Simulating Electron Transfer on Noisy Quantum Computers

Marvin Gajewski, Alejandro D. Somoza, Gary Schmiedinghoff +3

While simple spin-boson models have been realized on quantum hardware, simulating extended electronic networks with local vibrational environments remains a fundamental challenge i…

Realizing the Petz Recovery Map on an NMR Quantum Processor

Gayatri Singh, Ram Sagar Sahani, Vinayak Jagadish +3

The Petz recovery map is a central construct in quantum information theory, providing an explicit, channel-aware prescription for reversing the effects of noise. Unlike standard qu…

Quantum Fisher information from tensor network integration of Lyapunov equation

Gabriela Wójtowicz, Susana F. Huelga, Marek M. Rams +1

The Quantum Fisher Information (QFI) is a geometric measure of state deformation calculated along the trajectory parameterizing an ensemble of quantum states. It serves as a key co…

quant-ph2025★ 3 cited

Multi-state imaginarity and coherence in qubit systems

Mao-Sheng Li, Rafael Wagner, Lin Zhang

Traditionally, the characterization of quantum resources has focused on individual quantum states. Recent literature, however, has increasingly explored the characterization of res…

quant-ph2025★ 6 cited

Observation of period doubling and higher multiplicities in a driven single-spin system

Dhruv Deshmukh, Raúl B. González, Roberto Sailer +3

One of the prime features of quantum systems strongly driven by external time-periodic fields is the subharmonic response with integer multiples of the drive period $k T_{d}$ due t…

Configurable photonic simulator for quantum field dynamics

Mauro D'Achille, Martin Gärttner, Tobias Haas

Quantum field simulators provide unique opportunities for investigating the dynamics of quantum fields through tabletop experiments. A primary drawback of standard encoding schemes…

Estimation of multivariate traces of states given partial classical information

Kyrylo Simonov, Rafael Wagner, Ernesto Galvão

Bargmann invariants of order $n$ , defined as multivariate traces of quantum states $Tr [ρ_{1} ρ_{2} \dots ρ_{n}]$ , are useful in applications ranging from quantum metrology to cert…

Coherence as a resource for phase estimation

Felix Ahnefeld, Thomas Theurer, Martin B. Plenio

Quantum phase estimation is a core task in quantum technologies ranging from metrology to quantum computing, where it appears as a key subroutine in various algorithms. Here, we qu…

Quantum Cramer-Rao Precision Limit of Noisy Continuous Sensing

Dayou Yang, Moulik Ketkar, Koenraad Audenaert +2

Quantum sensors hold considerable promise for precision measurement, yet their capabilities are inherently constrained by environmental noise. A fundamental task in quantum sensing…

Isoenergetic model for optical downconversion and error-specific limits of the parametric approximation

D. B. Horoshko, V. S. Shchesnovich

Optical downconversion is widely used for generating photon pairs, squeezed and entangled states of light, making it an indispensable tool in quantum optics and quantum information…

Hidden facts in Landau-Zener transitions revealed by the Riccati Equation

Eric P. Glasbrenner, Yannik Gerdes, Sándor Varró +1

We express the dynamics of the two probability amplitudes in the elementary Landau-Zener problem in terms of the solution of the corresponding Riccati differential equation and ide…

Time-resolved second-order autocorrelation function of parametric downconversion

D. B. Horoshko, S. Srivastava, F. Sośnicki +4

We study a possibility of measuring the time-resolved second-order autocorrelation function of one of two beams generated in type-II parametric downconversion by means of temporal…