105 citations · 428 across the 25 of their papers we have counts for
26 papers
Inter-qubit correlation dynamics driven by mutual interactions
Aleksandra Kwiatkowska, Waldemar Kłobus
A particularly useful tool for characterizing multi-qubit systems is the correlation tensor, providing an experimentally friendly and theoretically concise representation of quantu…
Exploring Many-body Interactions Through Quantum Fisher Information
Paweł Cieśliński, Paweł Kurzyński, Tomasz Sowiński +2
The investigation of many-body interactions holds significant importance in both quantum foundations and information. Hamiltonians coupling multiple particles at once, beyond other…
The fastest generation of multipartite entanglement with natural interactions
Paweł Cieśliński, Waldemar Kłobus, Paweł Kurzyński +2
Natural interactions among multiple quantum objects are fundamentally composed of two-body terms only. In contradistinction, single global unitaries that generate highly entangled…
Salient signatures of entanglement in the surrounding environment
Łukasz Rudnicki, Waldemar Kłobus, Otavio A. D. Molitor +1
We develop a model in which presence of entanglement in a quantum system can be confirmed through coarse observations of the environment surrounding the system. This counter-intuit…
Valid and efficient entanglement verification with finite copies of a quantum state
Pawel Cieslinski, Jan Dziewior, Lukas Knips +5
Detecting entanglement in multipartite quantum states is an inherently probabilistic process, typically with a few measured samples. The level of confidence in entanglement detecti…
Transition from order to chaos in reduced quantum dynamics
Waldemar Kłobus, Paweł Kurzyński, Marek Kuś +3
We study a damped kicked top dynamics of a large number of qubits () and focus on an evolution of a reduced single-qubit subsystem. Each subsystem is subjecte…
Gaussian state entanglement witnessing through lossy compression
Waldemar Klobus, Pawel Cieslinski, Lukas Knips +2
We propose a method to witness entanglement between two continuous-variable systems in a Gaussian state. Its key ingredient is a local lossy state transfer from the original spatia…
Cooperation and dependencies in multipartite systems
Waldemar Klobus, Marek Miller, Mahasweta Pandit +7
We propose an information-theoretic quantifier for the advantage gained from cooperation that captures the degree of dependency between subsystems of a global system. The quantifie…
Multipartite Entanglement Analysis From Random Correlations
Lukas Knips, Jan Dziewior, Waldemar Kłobus +5
Quantum entanglement is usually revealed via a well aligned, carefully chosen set of measurements. Yet, under a number of experimental conditions, for example in communication with…
-uniform mixed states
Waldemar Klobus, Adam Burchardt, Adrian Kolodziejski +4
We investigate the maximum purity that can be achieved by k-uniform mixed states of N parties. Such N-party states have the property that all their k-party reduced states are maxim…
Higher dimensional entanglement without correlations
Waldemar Klobus, Wieslaw Laskowski, Tomasz Paterek +2
It has been demonstrated both theoretically and experimentally that genuine multipartite entanglement between qubits can exist even in the absence of multipartite correlations. Her…
Measurement uncertainty from no-signaling and non-locality
Justyna Łodyga, Waldemar Kłobus, Ravishankar Ramanathan +3
One of the formulations of Heisenberg uncertainty principle, concerning so-called measurement uncertainty, states that the measurement of one observable modifies the statistics of…
No-signaling versus quantum constraints for spatio-temporal correlations caused by weak measurement
Justyna Łodyga, Waldemar Kłobus, Andrzej Grudka +2
One of the formulations of Heisenberg uncertainty principle, concerning so-called measurement uncertainty, states that the measurement of one observable modifies the statistics of…
The Conditional Uncertainty Principle
Gilad Gour, Andrzej Grudka, Michał Horodecki +3
We develop a general operational framework that formalizes the concept of conditional uncertainty in a measure-independent fashion. Our formalism is built upon a mathematical relat…
Axiomatic approach to contextuality and nonlocality
Karol Horodecki, Andrzej Grudka, Pankaj Joshi +2
We present a unified axiomatic approach to contextuality and non-locality based on the fact that both are resource theories. In those theories the main objects are consistent boxes…
Some exact results for the zero-bandwidth extended Hubbard model with intersite charge and magnetic interactions
Konrad Jerzy Kapcia, Waldemar Kłobus, Stanisław Robaszkiewicz
The extended Hubbard model in the zero-bandwidth limit is studied. The effective Hamiltonian consists of (i) on-site interaction and intersite (ii) density-density interaction…
Communication strength of correlations violating monogamy relations
Waldemar Kłobus, Michał Oszmaniec, Remigiusz Augusiak +1
In any theory satisfying the no-signaling principle correlations generated among spatially separated parties in a Bell-type experiment are subject to certain constraints known as m…
Entanglement witnessing and quantum cryptography with non-ideal ferromagnetic detectors
Waldemar Kłobus, Andrzej Grudka, Andreas Baumgartner +3
We investigate theoretically the use of non-ideal ferromagnetic contacts as a mean to detect quantum entanglement of electron spins in transport experiments. We use a designated en…
When Are Popescu-Rohrlich Boxes and Random Access Codes Equivalent?
Andrzej Grudka, Karol Horodecki, Michał Horodecki +2
We study a problem of interconvertibility of two supra-quantum resources: one is so called PR-box, which violates CHSH inequality up to maximal algebraic bound, and second is so ca…
Conjectured strong complementary-correlations tradeoff
Andrzej Grudka, Michał Horodecki, Paweł Horodecki +3
We conjecture new uncertainty relations which restrict correlations between results of measurements performed by two separated parties on a shared quantum state. The first uncertai…
Quantifying Contextuality
A. Grudka, K. Horodecki, M. Horodecki +5
Contextuality is central to both the foundations of quantum theory and to the novel information processing tasks. Although it was recognized before Bell's nonlocality, despite some…
Nonlocality activation in entanglement swapping chains
Waldemar Kłobus, Wiesław Laskowski, Marcin Markiewicz +1
We consider multiple entanglement swappings performed on a chain of bipartite states. Each state does not violate CHSH inequality. We show that before some critical number of entan…
Interplay between charge and magnetic orderings in the zero-bandwidth limit of the extended Hubbard model for strong on-site repulsion
Konrad Kapcia, Waldemar Kłobus, Stanisław Robaszkiewicz
A simple effective model of charge ordered and (or) magnetically ordered insulators is studied. The tight binding Hamiltonian analyzed consists of (i) the effective on-site interac…
Comment on "Information flow of quantum states interacting with closed timelike curves"
Waldemar Klobus, Andrzej Grudka, Antoni Wojcik
We show that recent results on the interaction of causality-respecting particles with particles on closed timelike curves derived in [Phys. Rev. A 82, 062330 (2010)] depend on ambi…