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Year  Points  List 

Year 2024  100  Ministry scored journals list 2024 
Year  Points  List 

2024  100  Ministry scored journals list 2024 
2023  140  Ministry Scored Journals List 
2022  100  Ministry Scored Journals List 20192022 
2021  100  Ministry Scored Journals List 20192022 
2020  100  Ministry Scored Journals List 20192022 
2019  100  Ministry Scored Journals List 20192022 
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2017  35  A 
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2015  35  A 
2014  35  A 
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Year 2022  5.4 
Year  Points 

2022  5.4 
2021  5.7 
2020  5.3 
2019  5.3 
2018  5.2 
2017  5.1 
2016  6.7 
2015  5.3 
2014  5.4 
2013  5.5 
2012  5.2 
2011  5 
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total: 113
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Year 2022

Dynamical nonlocality in quantum time via modular operators
PublicationWe formalize the concept of the modular energy operator within the Page and Wootters timeless framework. As a result, this operator is elevated to the same status as the more studied modular operators of position and momentum. In analogy with dynamical nonlocality in space associated with the modular momentum, we introduce and analyze the nonlocality in time associated with the modular energy operator. Some applications of our...

Joint experimental and theoretical study on lowenergy elastic electron scattering by gaseous alkynes: Differential cross sections, shape resonances, and methylation effects
PublicationA detailed comparison of experimental and theoretical elastic cross sections for lowenergy electron scattering by ethyne, taken earlier in our group by Gauf et al. [Phys. Rev. A 87, 012710 (2013)], and some of its methylated derivatives, propyne, and the isomers 1butyne and 2butyne, taken here, are presented. The present differential cross sections were measured at incident electron energies ranging from 1 eV to 30 eV and...

Negative result about the construction of genuinely entangled subspaces from unextendible product bases
PublicationUnextendible product bases (UPBs) provide a versatile tool with various applications across different areas of quantum information theory. Their comprehensive characterization is thus of great importance and has been a subject of vital interest for over two decades now. An open question asks about the existence of UPBs, which are genuinely unextendible, i.e., they are not extendible even with biproduct vectors. In other words,...
Year 2020

Blurred quantum Darwinism across quantum reference frames
PublicationQuantum Darwinism describes objectivity of quantum systems via their correlations with their environmentinformation that hypothetical observers can recover by measuring the environments. However, observations are done with respect to a frame of reference. Here, we take the formalism of [Giacomini, CastroRuiz, & Brukner. Nat Commun 10, 494 (2019)], and consider the repercussions on objectivity when changing quantum reference...

Experimental test of nonclassicality with arbitrarily low detection efficiency
PublicationWe theoretically introduce and experimentally demonstrate the realization of a nonclassicality test that allows for arbitrarily low detection efficiency without invoking an extra assumption of independence of the devices. Our test and its implementation is set in a prepareandmeasure scenario with an upper limit on the classical communication capacity of the channel through which the systems are communicated. The essence for our...
Year 2019

Continuum wave functions for estimating the electric dipole moment: Calculation based on a multiconfiguration DiracHartreeFock approximation
PublicationThe multiconfiguration DiracHartreeFock method is employed to calculate the continuum electron wave functions, which are then used to estimate their contribution to the atomic electric dipole moment (EDM) of 129Xe. The EDM arises from (P,T)odd electronnucleon tensorpseudotensor and pseudoscalarscalar interactions, the nuclear Schiff moment, the interaction of the electron electric dipole moment with nuclear magnetic moments,...

Elastic scattering of electrons from chloroform
PublicationWe present experimental and theoretical cross sections for elastic electron scattering from CHCl3. This is an important target because of its relevance to environmental chemistry and the plasma etching industry as a source of chlorine radicals. The experimental results were obtained at incident electron energies ranging from 0.5 to 800 eV in the 10deg130deg scattering angle range. Theoretically, the scattering cross sections in...

Entanglement of genuinely entangled subspaces and states: Exact, approximate, and numerical results
PublicationGenuinely entangled subspaces (GESs) are those subspaces of multipartite Hilbert spaces that consist only of genuinely multiparty entangled pure states. They are natural generalizations of the wellknown notion of completely entangled subspaces, which by definition are void of fully product vectors. Entangled subspaces are an important tool of quantum information theory as they directly lead to constructions of entangled states,...

Experimental determination of H2 mass stopping powers for lowenergy electrons
PublicationWe present experimental mass stopping powers of electrons in gaseous H2 obtained with an electron time offlight spectrometer, for the incident electron energy range of 11 to 25 eV. In our procedure, the average energy loss is derived from conversion of the measured electron timeofflight spectra into equivalent electron energyloss spectra. Our present results are compared with the only available experimental measurement and...

Experimentally feasible semideviceindependent certification of fouroutcome positiveoperatorvalued measurements
PublicationRecently the quantum information science community devoted a lot of attention to the theoretical and practical aspects of generalized measurements, the formalism of all possible quantum operations leading to acquisition of classical information. On the other hand, due to imperfections present in quantum devices, and limited thrust to them, a trend of formulating quantum information tasks in a semideviceindependent manner emerged....

Reexamination of the decoherence of spin registers
PublicationWe revisit the decoherence process of a multiqubit register interacting with a thermal bosonic bath. We generalize the previous studies by considering not only the register’s behavior but also a part of its environment. In particular, we are interested in information flow from the register to the environment, which we describe using recently introduced multipartite quantum state structures called spectrum broadcast structures....
Year 2018

Constructing genuinely entangled multipartite states with applications to local hidden variables and local hidden states models
PublicationBuilding upon the results of R. Augusiak et al. [Phys. Rev. Lett. 115, 030404 (2015)] we develop a general approach to the generation of genuinely entangled multipartite states of any number of parties from genuinely entangled states of a fixed number of parties, in particular, the bipartite entangled ones. In our approach, certain isometries whose output subspaces are either symmetric or genuinely entangled in some multipartite...

Electron collisions with cyanoacetylene HC3N : Vibrational excitation and dissociative electron attachment
PublicationWe experimentally probe electron collisions with HC3N in the energy range from 0 to 10 eV with the focus on vibrational excitation and dissociative electron attachment. The vibrational excitation cross sections show a number of resonances which are mode specific: the two dominant π∗ resonances are visible in the excitation of all the vibrational modes; however, broad σ ∗ resonances are visible only in certain bondstretching vibrational...

Entangled Histories vs. the TwoStateVector Formalism  Towards a Better Understanding of Quantum Temporal Correlations
PublicationThe TwoStateVector formalism and the Entangled Histories formalism are attempts to betterunderstand quantum correlations in time. Both formalisms share some similarities, but they are notidentical, having subtle differences in their interpretation and manipulation of quantum temporalstructures. However, the main objective of this paper is to prove that, with appropriately definedscalar products, both formalisms can be...

From unextendible product bases to genuinely entangled subspaces
PublicationUnextendible product bases (UPBs) are interesting mathematical objects arising in composite Hilbert spaces that have found various applications in quantum information theory, for instance in a construction of bound entangled states or Bell inequalities without quantum violation. They are closely related to another important notion, completely entangled subspaces (CESs), which are those that do not contain any fully separable pure...

Lowenergy electron scattering from molecular hydrogen: Excitation of the X1Σg+ to b3Σu+ transition
PublicationWe present timeofflight differential crosssection measurements and convergent closecoupling calculations of differential cross sections for the electronimpact excitation of the X 1 g + → b 3 u + transition in molecular hydrogen. A part of this work was recently published [M. Zawadzki et al., Phys. Rev. A 97, 050702(R) (2018)]. In this work, agreement between theory and experiment is excellent overall, and marks a transition...

Redundant information encoding in QED during decoherence
PublicationBroadly understood decoherence processes in quantum electrodynamics, induced by neglecting either the radiation [L. Landau, Z. Phys. 45, 430 (1927)] or the charged matter [N. Bohr and L. Rosenfeld, K. Danske Vidensk. Selsk, Math.Fys. Medd. XII, 8 (1933)], have been studied from the dawn of the theory. However, what happens in between, when a part of the radiation may be observed, as is the case in many reallife situations, has...

Secondorder Stark effect and polarizability of a relativistic twodimensional hydrogenlike atom in the ground state
PublicationThe secondorder Stark effect for a planar Dirac oneelectron atom in the ground state is analyzed within the framework of the RayleighSchrödinger perturbation theory, with the use of the Sturmian series expansion of the generalized DiracCoulomb Green's function. A closedform analytical expression for the static dipole polarizability of that system is found. The formula involves the generalized hypergeometric function ${}_{3}F_{2}$...

Static magnetic multipole susceptibilities of the relativistic hydrogenlike atom in the ground state: Application of the Sturmian expansion of the generalized DiracCoulomb Green function
PublicationWe study far and nearfield magnetic and electric multipole moments induced in the ground state of the Dirac oneelectron atom placed in a weak 2Lpole magnetostatic field. The analysis is carried out within the framework of the firstorder RayleighSchrödinger perturbation theory, with the use of the Sturmian expansion of the generalized DiracCoulomb Green function [Szmytkowski, J. Phys. B 30, 825 (1997);J. Phys. B 30, 2747(E)...

System information propagation for composite structures
PublicationWe study in details decoherence process of a spin register, coupled to a spin environment. We use recently developed methods of information transfer study in open quantum systems to analyze information flow between the register and its environment. We show that there are regimes when not only the register decoheres effectively to a classical bit string, but this bit string is redundantly encoded in the environment, making it available...

Timeofflight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X1Σ+g→b3Σ+u transition
PublicationThe electron impact X1Σ+g to b3Σ+u transition in molecular hydrogen is one of the most important dissociation pathways to forming atomic hydrogen atoms, and is of great importance in modeling astrophysical and industrial plasmas where molecular hydrogen is a substantial constituent. Recently it has been found that the convergent closecoupling (CCC) cross sections of Zammit et al. [Phys. Rev. A 95, 022708 (2017)] are up to a factor...

Tradeoffs in multiparty Bellinequality violations in qubit networks
PublicationTwo overlapping bipartite binary input Bell inequalities cannot be simultaneously violated as this would contradict the usual nosignalling principle. This property is known as monogamy of Bell inequality violations and generally Bell monogamy relations refer to tradeoffs between simultaneous violations of multiple inequalities. It turns out that multipartite Bell inequalities admit weaker forms of monogamies that allow for violations...
Year 2017

Complementarity between entanglementassisted and quantum distributed random access code
PublicationCollaborative communication tasks such as random access codes (RACs) employing quantum resources have manifested great potential in enhancing information processing capabilities beyond the classical limitations. The two quantum variants of RACs, namely, quantum random access code (QRAC) and the entanglementassisted random access code (EARAC), have demonstrated equal prowess for a number of tasks. However, there do exist specific...

Generic appearance of objective results in quantum measurements
PublicationMeasurement is of central interest in quantum mechanics as it provides the link between the quantum world and the world of everyday experience. One of the features of everyday experience is its robust, objective character, contrasting the delicate nature of quantum systems. Here we analyze in a completely modelindependent way the celebrated von Neumann measurement process, using recent techniques of information flow, studied in...

Information content of systems as a physical principle
PublicationTo explain the conceptual gap between classical and quantum and other, hypothetical descriptions of the world, several principles have been proposed. So far, all these principles have not explicitly included the uncertainty relation. Here we introduce an information content principle ( ICP ) which represents a constrained uncertainty principle. The principle, by taking into account the encoding and decoding properties of a single physical...

Objectivity in the nonMarkovian spinboson model
PublicationObjectivity constitutes one of the main features of the macroscopic classical world. An important aspect of the quantumtoclassical transition issue is to explain how such a property arises from the microscopic quantum theory. Recently, within the framework of open quantum systems, there has been proposed such a mechanism in terms of the socalled spectrum broadcast structures. These are multipartite quantum states of the system...
Year 2016

Closedform expression for the magnetic shielding constant of the relativistic hydrogenlike atom in an arbitrary discrete energy eigenstate: Application of the Sturmian expansion of the generalized Dirac–Coulomb Green function
PublicationWe present analytical derivation of the closedform expression for the dipole magnetic shielding constant of a Dirac oneelectron atom being in an arbitrary discrete energy eigenstate. The external magnetic field, by which the atomic state is perturbed, is assumed to be weak, uniform, and time independent. With respect to the atomic nucleus we assume that it is pointlike, spinless, motionless, and of charge Ze. Calculations are...

Electron scattering from 2methyl–1,3butadiene,C5H8, molecules: Role of methylation
PublicationWe report crosssection results from experimental and theoretical investigations into electron collisions with the 2methyl–1,3butadiene [C5H8] molecule. The current results are compared with our previous results for the 1,3butadiene [C4H6] molecule, a structural homologue of 2methyl–1,3butadiene, to investigate how the methylation (the substitution of hydrogen atom by a methyl group) affects the shape and/or magnitude of the...

Magneticfieldinduced electric quadrupole moments for relativistic hydrogenlike atoms: Application of the Sturmian expansion of the generalized DiracCoulomb Green function
PublicationWe consider a Dirac oneelectron atom placed in a weak, static, uniform magnetic field. We show that, to the first order in the strength of the external field, the only electric multipole moments, which are induced by the perturbation in the atom, are those of an even order. Using the Sturmian expansion of the generalized DiracCoulomb Green function we derive a closedform expression for the electric quadrupole moment induced...

Static electric multipole susceptibilities of the relativistic hydrogenlike atom in the ground state: Application of the Sturmian expansion of the generalized DiracCoulomb Green function
PublicationThe ground state of the Dirac oneelectron atom, placed in a weak, static electric field of definite $2^{L}$ polarity, is studied within the framework of the firstorder perturbation theory. The Sturmian expansion of the generalized DiracCoulomb Green function [R. Szmytkowski, J. Phys. B: At. Mol. Opt. Phys. 30, 825 (1997); erratum R. Szmytkowski, J. Phys. B: At. Mol. Opt. Phys. 30, 2747 (1997)] is used to derive closedform analytical...
Year 2015

Bound on Bell inequalities by fraction of determinism and reverse triangle inequality
PublicationIt is an established fact that entanglement is a resource. Sharing an entangled state leads to nonlocal correlations and to violations of Bell inequalities. Such nonlocal correlations illustrate the advantage of quantum resources over classical resources. In this paper, we quantitatively study Bell inequalities with 2 × n inputs. As found in Gisin et al. [Int. J. Quantum. Inform. 05, 525 (2007)], quantum mechanical correlations...

Deviceindependent quantum key distribution based on measurement inputs
PublicationWe provide an analysis of a family of deviceindependent quantum key distribution (QKD) protocols that has the following features. (a) The bits used for the secret key do not come from the results of the measurements on an entangled state but from the choices of settings. (b) Instead of a single security parameter (a violation of some Bell inequality) a set of them is used to estimate the level of trust in the secrecy of the key....

Distributed correlations and information flows within a hybrid multipartite quantumclassical system
PublicationUnderstanding the nonMarkovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative interpretations have been given by either the role of the environment as a control device or the concept of hidden entanglement. We address this issue from an informationtheoretic point of view. To this aim, we consider a paradigmatic tripartite...

Inequivalence of entanglement, steering, and Bell nonlocality for general measurements
PublicationEinsteinPodolskyRosen steering is a form of inseparability in quantum theory commonly acknowledged to be intermediate between entanglement and Bell nonlocality. However, this statement has so far only been proven for a restricted class of measurements, namely, projective measurements. Here we prove that entanglement, oneway steering, twoway steering, and nonlocality are genuinely different considering general measurements,...

Magnetizability of the relativistic hydrogenlike atom in an arbitrary discrete energy eigenstate: Application of the Sturmian expansion of the generalized DiracCoulomb Green function
PublicationThe Sturmian expansion of the generalized DiracCoulomb Green function [R.\/~Szmytkowski, J.\ Phys.\ B 30 (1997) 825; erratum 30 (1997) 2747] is exploited to derive a closedform expression for the magnetizability of an arbitrary discrete state of the relativistic oneelectron atom with a pointlike, spinless and motionless nucleus of charge $Ze$. The result has the form of a double finite sum involving the generalized hypergeometric...

Method for universal detection of twophoton polarization entanglement
PublicationDetecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing. Surprisingly, no direct (i.e., without quantum tomography) universal experimental implementation of a necessary and sufficient test of entanglement has been designed even for a general twoqubit state. Here we propose an experimental method for detecting a collective universal...

Positron scattering on molecular hydrogen: Analysis of experimental and theoretical uncertainties
PublicationExperiments performed in recent years on positron scattering from molecular hydrogen indicated a rise of the total cross section in the limit of zero energy, but essentially disagree on the amplitude of this rise. Mitroy and collaborators [J.Y. Zhang et al., Phys. Rev. Lett. 103, 223202 (2009)] predicted a scattering length somewhat different from values deduced experimentally. Using a Markov chain Monte Carlo modified effective...

Progress towards a unified approach to entanglement distribution
PublicationEntanglement distribution is key to the success of secure communication schemes based on quantum mechanics, and there is a strong need for an ultimate architecture able to overcome the limitations of recent proposals such as those based on entanglement percolation or quantum repeaters. In this work we provide a broad theoretical background for the development of such technologies. In particular, we investigate the question of whether...

Quantum metrology: Heisenberg limit with bound entanglement
PublicationQuantum entanglement may provide a huge boost in the precision of parameter estimation. However, quantum metrology seems to be extremely sensitive to noise in the probe state. There is an important still open question: What type of entanglement is useful as a resource in quantum metrology? Here we raise this question in relation to entanglement distillation. We provide a counterintuitive example of a family of bound entangled states...

Quantum origins of objectivity
PublicationIn spite of all of its successes, quantum mechanics leaves us with a central problem: How does nature create a bridge from fragile quanta to the objective world of everyday experience? Here we find that a basic structure within quantum mechanics that leads to the perceived objectivity is a socalled spectrum broadcast structure. We uncover this based on minimal assumptions, without referring to any dynamical details or a concrete...

Robust amplification of SanthaVazirani sources with three devices
PublicationWe demonstrate that amplification of arbitrarily weak randomness is possible using quantum resources. We present a randomness amplification protocol that involves Bell experiments. We find a Bell inequality which can amplify arbitrarily weak randomness and give a detailed analysis of the protocol involving it. Our analysis includes finding a sufficient violation of Bell inequality as a function of the initial quality of randomness....
Year 2014

Electricfieldinduced magnetic quadrupole moment in the ground state of the relativistic hydrogenlike atom: Application of the Sturmian expansion of the generalized DiracCoulomb Green function
PublicationStosując rozwinięcie sturmowskie uogólnionej funkcji GreenaDiracaCoulomba, znaleziono wyrażenie analityczne dla magnetycznego momentu kwadrupolowego, indukowanego przez zewnętrzne słabe, stałe, jednorodne pole elektryczne w stanie podstawowym relatywistycznego atomujednoelektronowego.

Electronscattering cross sections for selected alkyne molecules: Measurements and calculations
PublicationWe report crosssection results from experimental and theoretical studies on electron collisions with 1butyne (HC≡C–CH2CH3) and acetylene (HC≡CH) molecules and from computations for a propyne (HC≡C–CH3) molecule. Absolute grand total electronscattering cross sections (TCSs) were measured at impact energies ranging from about 0.5 to 300 eV using the linear electrontransmission method. The TCS energy curve for 1butyne has a...

Elemental and tight monogamy relations in nonsignaling theories
PublicationPhysical principles constrain the way nonlocal correlations can be distributed among distant parties. These constraints are usually expressed by monogamy relations that bound the amount of Bell inequality violation observed among a set of parties by the violation observed by a different set of parties. We prove here that much stronger monogamy relations are possible for nonsignaling correlations by showing how nonlocal correlations...

Free randomness amplification using bipartite chain correlations
PublicationA direct analysis of the task of randomness amplification from SanthaVazirani sources using the violation of the chained Bell inequality is performed in terms of the convex combination of nosignaling boxes required to simulate quantum violation of the inequality. This analysis is used to find the exact threshold value of the initial randomness parameter from which perfect randomness can be extracted in the asymptotic limit of...

Longdistance quantum communication over noisy networks without longtime quantum memory
PublicationThe problem of sharing entanglement over large distances is crucial for implementations of quantum cryptography. A possible scheme for longdistance entanglement sharing and quantum communication exploits networks whose nodes share EinsteinPodolskyRosen (EPR) pairs. In Perseguers et al. [Phys. Rev. A 78, 062324 (2008)] the authors put forward an important isomorphism between storing quantum information in a dimension D and transmission...

Properties of dimension witnesses and their semidefinite programming relaxations
PublicationIn this paper we develop a method for investigating semideviceindependent randomness expansion protocols that was introduced in Li et al. [H.W. Li, P. Mironowicz, M. Pawłowski, Z.Q. Yin, Y.C. Wu, S. Wang, W. Chen, H.G. Hu, G.C. Guo, and Z.F. Han, Phys. Rev. A 87, 020302(R) (2013)]. This method allows us to lower bound, with semidefinite programming, the randomness obtained from random number generators based on dimension...

Quantumstate transfer in spin chains via isolated resonance of terminal spins
PublicationWe propose a quantumstate transfer protocol in a spin chain that requires only the control of the spins at the ends of the quantum wire. The protocol is to a large extent insensitive to inhomogeneity caused by local magnetic fields and perturbation of exchange couplings. Moreover, apart from the free evolution regime, it allows one to induce an adiabatic spin transfer, which provides the possibility of performing the transfer...

Sensitivity of entanglement decay of quantumdot spin qubits to the external magnetic field
PublicationWe study the decay of entanglement of quantumdot electronspin qubits under hyperfineinteractionmediated decoherence.We show that twoqubit entanglement of a single entangled initial state may exhibit decay characteristic of two disentanglement regimes in a single sample, when the externalmagnetic field is changed. The transition is manifested by the suppression of timedependent entanglement oscillations which are superimposed...
Year 2013

Anomalous decay of quantum correlations of quantumdot qubits
PublicationWe study the evolution of quantum correlations, quantified by the geometric discord, of two excitonic quantumdot qubits under the influence of the phonon environment. We show that the decay of these correlations differs substantially from the decay of entanglement. Instead of displaying suddendeathtype behavior, the geometric discord shows a tendency to undergo transitions between different types of decay, is sensitive to nonlocal...
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