26 citations · 138 across the 26 of their papers we have counts for
26 papers
Limits of Stochastic Semigroups and Block-Triangular Majorisation
Fabio Deelan Cunden, Jakub Czartowski, Giovanni Gramegna +1
We investigate limits of semigroups of stochastic matrices defined by their invariant distribution. Given probability vectors depending on a parameter , we introduce a no…
Manipulating heterogeneous quantum resources over a network
Ray Ganardi, Jeongrak Son, Jakub Czartowski +2
Quantum information processing relies on a variety of resources, including entanglement, coherence, non-Gaussianity, and magic. In realistic settings, protocols run on networks of…
Approximate pushforward designs and image bounds on approximations
Jakub Czartowski, Adam Sawicki, Karol Życzkowski
We extend the framework of quantum pushforward designs to the approximate setting, in which moment operators agree only up to finite precision. We first formulate a general transfe…
Trading athermality for nonstabiliserness
A. de Oliveira Junior, Rafael A. Macedo, Jakub Czartowski +2
Quantum advantage arises from quantum states that cannot be efficiently simulated on a classical computer. Such states are characterised by a property known as nonstabiliserness. I…
Efficient state estimation on quantum processors
Victor Gonzalez Avella, Abraham Vega Vargas, Tomas Merlo Vergara +6
We present two scalable and entanglement-free methods for estimating the collective state of an n-qubit quantum computer. The first method consists of a fixed set of five quantum c…
Comment and correction for "On Explicit Construction of Simplex -designs" by M. S. Baladram
Jakub Czartowski
In [Bal18] a new method of constructing simplex designs based on cyclic group on elements has been proposed. One of the claims put forward therein is existence of 3-point simpl…
Quantum Pushforward Designs
Jakub Czartowski, Karol Życzkowski
Designs, structures connected to averaging with respect to a given measure using finite sets of points, have proven themselves as invaluable tools across the field of quantum infor…
Relative volume of comparable pairs under semigroup majorization
Fabio Deelan Cunden, Jakub Czartowski, Giovanni Gramegna +1
Any semigroup of stochastic matrices induces a semigroup majorization relation on the set of probability -vectors. Pick at ra…
Cyclic measurements and simplified quantum state tomography
Victor Gonzalez Avella, Jakub Czartowski, Dardo Goyeneche +1
Tomographic reconstruction of quantum states plays a fundamental role in benchmarking quantum systems and accessing information encoded in quantum-mechanical systems. Among the inf…
Entanglement generation from athermality
A. de Oliveira Junior, Jeongrak Son, Jakub Czartowski +1
We investigate the thermodynamic constraints on the pivotal task of entanglement generation using out-of-equilibrium states through a model-independent framework with minimal assum…
Catalytic transformations for thermal operations
Jakub Czartowski, A. de Oliveira Junior
What are the fundamental limits and advantages of using a catalyst to aid thermodynamic transformations between quantum systems? In this work, we answer this question by focusing o…
Quantum convolutional channels and multiparameter families of 2-unitary matrices
Rafał Bistroń, Jakub Czartowski, Karol Życzkowski
Many alternative approaches to construct quantum channels with large entangling capacity were proposed in the past decade, resulting in multiple isolated gates. In this work, we pu…
Iso-entangled bases and joint measurements
Flavio Del Santo, Jakub Czartowski, Karol Życzkowski +1
While entanglement between distant parties has been extensively studied, entangled measurements have received relatively little attention despite their significance in understandin…
Thermal recall: Memory-assisted Markovian thermal processes
Jakub Czartowski, A. de Oliveira Junior, Kamil Korzekwa
We develop a resource-theoretic framework that allows one to bridge the gap between two approaches to quantum thermodynamics based on Markovian thermal processes (which model memor…
Minimal-noise estimation of noncommuting rotations of a spin
Jakub Czartowski, Karol Życzkowski, Daniel Braun
We propose an analogue of interferometry to measure rotation of a spin by using two-spin squeezed states. Attainability of the Heisenberg limit for the estimation…
Geometric structure of thermal cones
A. de Oliveira Junior, Jakub Czartowski, Karol Życzkowski +1
The second law of thermodynamics imposes a fundamental asymmetry in the flow of events. The so-called thermodynamic arrow of time introduces an ordering that divides the system's s…
Resource theory of Absolute Negativity
Roberto Salazar, Jakub Czartowski, A. de Oliveira Junior
A crucial goal of quantum information is to find new ways to exploit the properties of quantum devices as resources. One of the prominent properties of quantum devices of particula…
Confident entanglement detection via separable numerical range
Timo Simnacher, Jakub Czartowski, Konrad Szymański +1
We investigate the joint (separable) numerical range of multiple measurements, i.e., the regions of expectation values accessible with (separable) quantum states for given observab…
Entanglement in highly symmetric multipartite quantum states
Adam Burchardt, Jakub Czartowski, Karol Życzkowski
We present a construction of genuinely entangled multipartite quantum states based on the group theory. Analyzed states resemble the Dicke states, whereas the interactions occur on…
Perfect quantum-state synchronization
Jakub Czartowski, Ronny Müller, Karol Zyczkowski +1
We investigate the most general mechanisms that lead to perfect synchronization of the quantum states of all subsystems of an open quantum system starting from an arbitrary initial…
Bipartite quantum measurements with optimal single-sided distinguishability
Jakub Czartowski, Karol Życzkowski
We analyse orthogonal bases in a composite Hilbert space describing a bipartite quantum system and look for a basis with optimal single-sided mutual state distinguishab…
Optimal allocation of quantum resources
Roberto Salazar, Tanmoy Biswas, Jakub Czartowski +2
The optimal allocation of resources is a crucial task for their efficient use in a wide range of practical applications in science and engineering. This paper investigates the opti…
Trade--off relations for operation entropy of complementary quantum channels
Jakub Czartowski, Daniel Braun, Karol Życzkowski
The entropy of a quantum operation, defined as the von Neumann entropy of the corresponding Choi-Jamiołkowski state, characterizes the coupling of the principal system with the env…
Iso-entangled mutually unbiased bases, symmetric quantum measurements and mixed-state designs
Jakub Czartowski, Dardo Goyeneche, Markus Grassl +1
Discrete structures in Hilbert space play a crucial role in finding optimal schemes for quantum measurements. We solve the problem whether a complete set of five iso-entangled mutu…