838 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Forschungszentrum JülichDE268 papers
- University of WuppertalDE96 papers
- RWTH Aachen UniversityDE58 papers
- Eötvös Loránd UniversityHU57 papers
- University of GroningenNL48 papers
- University of RegensburgDE41 papers
- Zernike Institute for Advanced MaterialsNL37 papers
- University of EdinburghGB25 papers
- Deutsches Elektronen-Synchrotron DESYDE23 papers
- University of LiverpoolGB21 papers
- Centre National de la Recherche ScientifiqueFR20 papers
- The University of AdelaideAU19 papers
40 papers · 1 filter
On the experimental verification of the uncertainty principle of position and momentum
Thomas Schürmann, Ingo Hoffmann, Winfrid Görlich
Historically, Kennard was the first to choose the standard deviation as a quantitative measure of uncertainty, and neither he nor Heisenberg explicitly explained why this choice sh…
Unbalanced penalization: A new approach to encode inequality constraints of combinatorial problems for quantum optimization algorithms
Alejandro Montanez-Barrera, Dennis Willsch, Alberto Maldonado-Romo +1
Solving combinatorial optimization problems of the kind that can be codified by quadratic unconstrained binary optimization (QUBO) is a promising application of quantum computation…
On the fragility of gate-error metrics in simulation models of flux-tunable transmon quantum computers
Hannes Lagemann, Dennis Willsch, Madita Willsch +3
Constructing a quantum computer requires immensely precise control over a quantum system. A lack of precision is often quantified by gate-error metrics, such as the average infidel…
On the hardness of quadratic unconstrained binary optimization problems
Vrinda Mehta, Fengping Jin, Kristel Michielsen +1
We use exact enumeration to characterize the solutions of quadratic unconstrained binary optimization problems of less than 21 variables in terms of their distributions of Hamming…
Folding lattice proteins with quantum annealing
Anders Irbäck, Lucas Knuthson, Sandipan Mohanty +1
Quantum annealing is a promising approach for obtaining good approximate solutions to difficult optimization problems. Folding a protein sequence into its minimum-energy structure…
Improved variational quantum eigensolver via quasi-dynamical evolution
Manpreet Singh Jattana, Fengping Jin, Hans De Raedt +1
The variational quantum eigensolver (VQE) is a hybrid quantum-classical algorithm designed for current and near-term quantum devices. Despite its initial success, there is a lack o…
Quantum annealing for hard 2-SAT problems : Distribution and scaling of minimum energy gap and success probability
Vrinda Mehta, Fengping Jin, Hans De Raedt +1
In recent years, quantum annealing has gained the status of being a promising candidate for solving various optimization problems. Using a set of hard 2-satisfiabilty (2-SAT) probl…
Assessment of the variational quantum eigensolver: application to the Heisenberg model
Manpreet Singh Jattana, Fengping Jin, Hans De Raedt +1
We present and analyze large-scale simulation results of a hybrid quantum-classical variational method to calculate the ground state energy of the anti-ferromagnetic Heisenberg mod…
Numerical analysis of effective models for flux-tunable transmon systems
Hannes Lagemann, Dennis Willsch, Madita Willsch +3
Simulations and analytical calculations that aim to describe flux-tunable transmons are usually based on effective models of the corresponding lumped-element model. However, when a…
On momentum operators given by Killing vectors whose integral curves are geodesics
Thomas Schürmann
We consider momentum operators on intrinsically curved manifolds. Given that the momentum operators are Killing vector fields whose integral curves are geodesics, it is shown that…
Benchmarking Advantage and D-Wave 2000Q quantum annealers with exact cover problems
Dennis Willsch, Madita Willsch, Carlos D. Gonzalez Calaza +4
We benchmark the quantum processing units of the largest quantum annealers to date, the 5000+ qubit quantum annealer Advantage and its 2000+ qubit predecessor D-Wave 2000Q, using t…
GPU-accelerated simulations of quantum annealing and the quantum approximate optimization algorithm
Dennis Willsch, Madita Willsch, Fengping Jin +2
We study large-scale applications using a GPU-accelerated version of the massively parallel Jülich universal quantum computer simulator (JUQCS--G). First, we benchmark JUWELS Boost…
Garden optimization problems for benchmarking quantum annealers
Carlos D. Gonzalez Calaza, Dennis Willsch, Kristel Michielsen
We benchmark the 5000+ qubit system Advantage coupled with the Hybrid Solver Service 2 released by D-Wave Systems Inc. in September 2020 by using a new class of optimization proble…
Random State Technology
Fengping Jin, Dennis Willsch, Madita Willsch +3
We review and extend, in a self-contained way, the mathematical foundations of numerical simulation methods that are based on the use of random states. The power and versatility of…
Quantum non-demolition dispersive readout of a superconducting artificial atom using large photon numbers
Daria Gusenkova, Martin Spiecker, Richard Gebauer +13
Reading out the state of superconducting artificial atoms typically relies on dispersive coupling to a readout resonator. For a given system noise temperature, increasing the circu…
Long-Time Correlations in Single-Neutron Interferometry Data
M. Willsch, D. Willsch, K. Michielsen +5
We present a detailed analysis of the time series of time-stamped neutron counts obtained by single-neutron interferometry. The neutron counting statistics display the usual Poisso…
Benchmarking the Quantum Approximate Optimization Algorithm
Madita Willsch, Dennis Willsch, Fengping Jin +2
The performance of the quantum approximate optimization algorithm is evaluated by using three different measures: the probability of finding the ground state, the energy expectatio…
Real-time simulation of flux qubits used for quantum annealing
Madita Willsch, Dennis Willsch, Fengping Jin +2
The real-time flux dynamics of up to three superconducting quantum interference devices (SQUIDs) are studied by numerically solving the time-dependent Schrödinger equation. The num…
PennyLane: Automatic differentiation of hybrid quantum-classical computations
Ville Bergholm, Josh Izaac, Maria Schuld +65
PennyLane is a Python 3 software framework for differentiable programming of quantum computers. The library provides a unified architecture for near-term quantum computing devices,…
Separation of conditions as a prerequisite for quantum theory
Hans De Raedt, Mikhail I. Katsnelson, Dennis Willsch +1
We introduce the notion of "separation of conditions" meaning that a description of statistical data obtained from experiments, performed under a set of different conditions, allow…
Testing quantum fault tolerance on small systems
D. Willsch, M. Willsch, F. Jin +2
We extensively test a recent protocol to demonstrate quantum fault tolerance on three systems: (1) a real-time simulation of five spin qubits coupled to an environment with two-lev…
Massively parallel quantum computer simulator, eleven years later
Hans De Raedt, Fengping Jin, Dennis Willsch +5
A revised version of the massively parallel simulator of a universal quantum computer, described in this journal eleven years ago, is used to benchmark various gate-based quantum a…
Analysis of Wigner's Set Theoretical Proof for Bell-type inequalities
Karl Hess, Hans De Raedt, Kristel Michielsen
We present a detailed analysis of the set theoretical proof of Wigner for Bell type inequalities with the following result. Wigner introduced a crucial assumption that is not relat…
From Boole to Leggett-Garg: Epistemology of Bell-type Inequalities
Karl Hess, Hans De Raedt, Kristel Michielsen
In 1862, George Boole derived an inequality for variables, now known as Boolean variables, that in his opinion represents a demarcation line between possible and impossible experie…