122 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Karlsruhe Institute of TechnologyDE7 papers
- University of FreiburgDE7 papers
- RMIT UniversityAU6 papers
- Institut NéelFR5 papers
- University of StuttgartDE5 papers
- Centre National de la Recherche ScientifiqueFR4 papers
- ETH ZurichCH4 papers
- National Institutes for Quantum Science and TechnologyJP4 papers
- Universität UlmDE3 papers
- Université Grenoble AlpesFR3 papers
- Cardiff UniversityGB2 papers
- Center for Integrated Quantum Science and TechnologyDE2 papers
25 papers · 1 filter
Learning Reduced Representations for Quantum Classifiers
Patrick Odagiu, Vasilis Belis, Lennart Schulze +6
Data sets that are specified by a large number of features are currently outside the area of applicability for quantum machine learning algorithms. An immediate solution to this im…
Reconfigurable dissipative entanglement between many spin ensembles: from robust quantum sensing to many-body state engineering
Anjun Chu, Mikhail Mamaev, Martin Koppenhöfer +2
An attractive approach for stabilizing entangled many-body spin states is to employ engineered dissipation. Most existing proposals either target relatively simple collective spin…
Readout of a solid state spin ensemble at the projection noise limit
Rouven Maier, Cheng-I Ho, Andrej Denisenko +4
Spin ensembles are central to quantum science, from frequency standards and fundamental physics searches to magnetic resonance spectroscopy and quantum sensing. Their performance i…
Extrapolation method to optimize linear-ramp QAOA parameters: Evaluation of QAOA runtime scaling
Vanessa Dehn, Martin Zaefferer, Gerhard Hellstern +3
The Quantum Approximate Optimization Algorithm (QAOA) has been suggested as a promising candidate for the solution of combinatorial optimization problems. Yet, whether - or under w…
Learning agent-based approach to the characterization of open quantum systems
Lorenzo Fioroni, Ivan Rojkov, Florentin Reiter
Characterizing quantum processes is crucial for the execution of quantum algorithms on available quantum devices. A powerful framework for this purpose is the Quantum Model Learnin…
Stabilization of cat-state manifolds using nonlinear reservoir engineering
Ivan Rojkov, Matteo Simoni, Elias Zapusek +2
We introduce a novel reservoir engineering approach for stabilizing multi-component Schrödinger's cat manifolds. The fundamental principle of the method lies in the destructive int…
Non-Gaussian generalized two-mode squeezing: applications to two-ensemble spin squeezing and beyond
Mikhail Mamaev, Martin Koppenhöfer, Andrew Pocklington +1
Bosonic two-mode squeezed states are paradigmatic entangled Gaussian states that have wide utility in quantum information and metrology. Here, we show that the basic structure of t…
Inverted-circuit zero-noise extrapolation for quantum gate error mitigation
Kathrin F. Koenig, Finn Reinecke, Walter Hahn +1
A common approach to deal with gate errors in modern quantum-computing hardware is zero-noise extrapolation. By artificially amplifying errors and extrapolating the expectation val…
Spin coherence in strongly coupled spin baths in quasi-two-dimensional layers
Philip Schätzle, Reyhaneh Ghassemizadeh, Daniel F. Urban +5
We investigate the spin-coherence decay of NV-spins interacting with the strongly-coupled bath of nitrogen defects in diamond layers. For thin diamond layers, we demonstrate th…
Improving the Performance of Digitized Counterdiabatic Quantum Optimization via Algorithm-Oriented Qubit Mapping
Yanjun Ji, Kathrin F. Koenig, Ilia Polian
This paper presents strategies to improve the performance of digitized counterdiabatic quantum optimization algorithms by cooptimizing gate sequences, algorithm parameters, and qub…
Characterization of coherent errors in gate layers with robustness to Pauli noise
Noah Kaufmann, Ivan Rojkov, Florentin Reiter
Characterization of quantum devices generates insights into their sources of disturbances. State-of-the-art characterization protocols often focus on incoherent noise and eliminate…
Exploring Quantum Synchronization with a Composite Two-Qubit Oscillator
Gaurav M. Vaidya, Arvind Mamgain, Samarth Hawaldar +4
Synchronization has recently been explored deep in the quantum regime with elementary few-level quantum oscillators such as qudits and weakly pumped quantum Van der Pol oscillators…
Characterizing crosstalk of superconducting transmon processors
Andreas Ketterer, Thomas Wellens
Currently available quantum computing hardware based on superconducting transmon architectures realizes networks of hundreds of qubits with the possibility of controlled nearest-ne…
Absorption and birefringence study for reduced optical losses in diamond with high NV concentration
T. Luo, F. A. Hahl, J. Langer +8
The use of diamond color centers such as the nitrogen-vacancy (NV) center is increasingly enabling quantum sensing and computing applications. Novel concepts like cavity coupling a…
Optimizing Quantum Algorithms on Bipotent Architectures
Yanjun Ji, Kathrin F. Koenig, Ilia Polian
Vigorous optimization of quantum gates has led to bipotent quantum architectures, where the optimized gates are available for some qubits but not for others. However, such gate-lev…
Special Session: Noisy Intermediate-Scale Quantum (NISQ) Computers -- How They Work, How They Fail, How to Test Them?
Sebastian Brandhofer, Simon Devitt, Thomas Wellens +1
First quantum computers very recently have demonstrated "quantum supremacy" or "quantum advantage": Executing a computation that would have been impossible on a classical machine.…
Complete characterization of quantum correlations by randomized measurements
Nikolai Wyderka, Andreas Ketterer, Satoya Imai +5
The fact that quantum mechanics predicts stronger correlations than classical physics is an essential cornerstone of quantum information processing. Indeed, these quantum correlati…
Probing the geometry of correlation matrices with randomized measurements
Nikolai Wyderka, Andreas Ketterer
The generalized Bloch decomposition of a bipartite quantum state gives rise to a correlation matrix whose singular values provide rich information about non-local properties of the…
Rapid determination of single substitutional nitrogen N concentration in diamond from UV-Vis spectroscopy
T. Luo, L. Lindner, R. Blinder +6
Single substitutional nitrogen atoms N are the prerequisite to create nitrogen-vacancy (NV) centers in diamonds. They serve as the electron donors to create the desired NV$^-…
Quantifying multiparticle entanglement with randomized measurements
Sophia Ohnemus, Heinz-Peter Breuer, Andreas Ketterer
Randomized measurements constitute a simple measurement primitive that exploits the information encoded in the outcome statistics of samples of local quantum measurements defined t…
Benchmarking the performance of portfolio optimization with QAOA
Sebastian Brandhofer, Daniel Braun, Vanessa Dehn +6
We present a detailed study of portfolio optimization using different versions of the quantum approximate optimization algorithm (QAOA). For a given list of assets, the portfolio o…
Proximal nitrogen reduces the fluorescence quantum yield of nitrogen-vacancy centres in diamond
Marco Capelli, Lukas Lindner, Tingpeng Luo +10
The nitrogen-vacancy colour centre in diamond is emerging as one of the most important solid-state quantum systems. It has applications to fields including high-precision sensing,…
Creation of nitrogen-vacancy centers in chemical vapor deposition diamond for sensing applications
T. Luo, L. Lindner, J. Langer +12
The nitrogen-vacancy (NV) center in diamond is a promising quantum system for magnetometry applications exhibiting optical readout of minute energy shifts in its spin sub-levels. K…
Development of All-Diamond Scanning Probes Based on Faraday Cage Angled Etching Techniques
C. Giese, P. Quellmalz, P. Knittel
We are proposing a novel fabrication method for single crystal diamond scanning probes, exploiting the method of Faraday cage angled etching (FCAE). Electron-beam lithography (EBL)…