72 citations · 331 across the 29 of their papers we have counts for
30 papers · 1 filter
Multinegativity and single-letter formulas for asymptotic entanglement
Raphael Brinster, Tulja Varun Kondra, Hermann Kampermann +2
The study of entanglement inevitably leads to the concept of regularization, where measures are evaluated on infinitely many copies of a state. Single-letter formulas try to make t…
Sharp Quantum Capacity Thresholds: Exponential Strong Converses for Degradable and Antidegradable Channels
Tulja Varun Kondra, Raphael Brinster, Hermann Kampermann +2
The quantum capacity of a noisy channel quantifies the maximum rate at which quantum information can be transmitted reliably. For general channels, its evaluation requires an optim…
Very Strong Irreversibility of Quantum Entanglement
Tulja Varun Kondra, Raphael Brinster, Hermann Kampermann +2
The manipulation of quantum entanglement is fundamentally irreversible: some mixed entangled states require pure entanglement for their preparation, although no pure entanglement c…
Quantum coherence as randomness under classical control
Gabriele Cobucci, Nicola D'Alessandro, Raphael Brinster +3
Quantum states that do not commute exhibit coherence, but only when the device preparing them is assumed to be unaffected by classical parameters inaccessible to the experimenter.…
Entanglement quantification with randomized measurements is maximally difficult
Julian Eisfeld, Nikolai Wyderka
The certification of quantum systems is essential for emerging quantum technologies, particularly in quantum communication, networks, and distributed computing, where maintaining a…
Robust certification of non-projective measurements: theory and experiment
Raphael Brinster, Peter Tirler, Shishir Khandelwal +7
Determining the conditions under which positive operator-valued measures (POVMs), the most general class of quantum measurements, outperform projective measurements remains a chall…
Maximally non-projective measurements are not always symmetric informationally complete
Gabriele Cobucci, Raphael Brinster, Shishir Khandelwal +4
Standard quantum measurements are projective. However, the full scope of quantum measurements is represented by positive operator-valued measures (POVMs) and many of these break th…
Multiplexed multipartite quantum repeater rates in the stationary regime
Julia A. Kunzelmann, Anton Trushechkin, Nikolai Wyderka +2
Multipartite quantum repeaters play an important role in quantum communication networks enabling the transmission of quantum information over larger distances. To increase the rate…
No quantum advantage without classical communication: fundamental limitations of quantum networks
Justus Neumann, Tulja Varun Kondra, Kiara Hansenne +5
Quantum networks connect systems at separate locations via quantum links, enabling a wide range of quantum information tasks between distant parties. Large-scale networks have the…
High-dimensional quantum key distribution rates for multiple measurement bases
Nikolai Wyderka, Giovanni Chesi, Hermann Kampermann +2
We investigate the advantages of high-dimensional encoding for a quantum key distribution protocol. In particular, we address a BBM92-like protocol where the dimension of the syste…
High-dimensional quantum key distribution with resource-efficient detection
Maciej Ogrodnik, Adam Widomski, Dagmar Bruß +7
While quantum key distribution (QKD) based on two-dimensional (qubit) encoding is a mature, field-tested technology, its performance is lacking for many cryptographic applications.…
Quantum Key Distribution with Basis-Dependent Detection Probability
Federico Grasselli, Giovanni Chesi, Nathan Walk +7
Quantum Key Distribution (QKD) is a promising technology for secure communication. Nevertheless, QKD is still treated with caution in certain contexts due to potential gaps between…
Bound entangled Bell diagonal states of unequal local dimensions, and their witnesses
Johannes Moerland, Nikolai Wyderka, Hermann Kampermann +1
Bell diagonal states constitute a well-studied family of bipartite quantum states that arise naturally in various contexts in quantum information. In this paper we generalize the n…
Experimental verification of bound and multiparticle entanglement with the randomized measurement toolbox
Chao Zhang, Yuan-Yuan Zhao, Nikolai Wyderka +10
In recent years, analysis methods for quantum states based on randomized measurements have been investigated extensively. Still, in the experimental implementations these methods w…
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…
Continuity of robustness measures in quantum resource theories
Jonathan Schluck, Gláucia Murta, Hermann Kampermann +2
Robustness measures are increasingly prominent resource quantifiers that have been introduced for quantum resource theories such as entanglement and coherence. Despite the generali…
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…
Refuting spectral compatibility of quantum marginals
Felix Huber, Nikolai Wyderka
The spectral variant of the quantum marginal problem asks: Given prescribed spectra for a set of overlapping quantum marginals, does there exist a compatible joint state? The main…
Construction of efficient Schmidt number witnesses for high-dimensional quantum states
Nikolai Wyderka, Giovanni Chesi, Hermann Kampermann +2
Recent progress in quantum optics has led to setups that are able to prepare high-dimensional quantum states for quantum information processing tasks. As such, it is of importance…
Shor-Laflamme distributions of graph states and noise robustness of entanglement
Daniel Miller, Daniel Loss, Ivano Tavernelli +3
The Shor-Laflamme distribution (SLD) of a quantum state is a collection of local unitary invariants that quantify -body correlations. We show that the SLD of graph states can be…
Statistically significant tests of multiparticle quantum correlations based on randomized measurements
Andreas Ketterer, Satoya Imai, Nikolai Wyderka +1
We consider statistical methods based on finite samples of locally randomized measurements in order to certify different degrees of multiparticle entanglement in intermediate-scale…
A complete hierarchy for the pure state marginal problem in quantum mechanics
Xiao-Dong Yu, Timo Simnacher, Nikolai Wyderka +2
Clarifying the relation between the whole and its parts is crucial for many problems in science. In quantum mechanics, this question manifests itself in the quantum marginal proble…
Entanglement characterization using quantum designs
Andreas Ketterer, Nikolai Wyderka, Otfried Gühne
We present in detail a statistical approach for the reference-frame-independent detection and characterization of multipartite entanglement based on moments of randomly measured co…
Characterizing quantum states via sector lengths
Nikolai Wyderka, Otfried Gühne
Correlations in multiparticle systems are constrained by restrictions from quantum mechanics. A prominent example for these restrictions are monogamy relations, limiting the amount…