Search results for: DOPED QUANTUM DOTS - Bridge of Knowledge

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Search results for: DOPED QUANTUM DOTS

Search results for: DOPED QUANTUM DOTS

  • Experimentally feasible semi-device-independent certification of four-outcome positive-operator-valued measurements

    Publication

    - PHYSICAL REVIEW A - Year 2019

    Recently 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 semi-device-independent manner emerged....

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  • The rovibrational energy levels of the diatomic silver anion and neutral silver dimer

    The process of a two-channel decay of the diatomic silver anion (Ag2-), namely the spontaneous electron ejection giving Ag2 + e- and the dissociation leading to Ag- + Ag is theoretically studied. The ground state potential energy curves (PECs) of the neutral silver dimer and anionic silver diatomic molecule are calculated using the single reference...

  • Hemocompatibility of nanocrystalline diamond layers

    Open Research Data
    version 1.4 open access

    The biocompatibility of the diamond films were investigated with whole human blood samples. Blood used in this study was drawn from 10 healthy human patients of different age, sex, and blood group. A 2 ml samples were collected into standard tubes with EDTA anticoagulation agent. Blood was used within 6 hours from the collection time. A reference blood...

  • Scanning electron microscopy (SEM) images of the boron-dopied carbon nanowalls surfaces

    Open Research Data

    The dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of boron-doped carbon nanowalls electrodes on silicon substrates. The surface is characterized by nano-walled structures. The obtained electrodes were doped with boron at the level of [B]/[C] = 1200ppm  in the gas atmosphere during the synthesis.

  • High temperature XRD diffraction patterns collected during the reoxidation process of SFM-based compounds

    Open Research Data
    embargo - series: SFM

    This dataset contains three file folders for SFM, LSFM (La-doped) and SFMNb (Nb-doped) respectively. Samples were reduced prior to the XRD measurements. The measurements were performed on Philipps X’Pert Pro diffractometer using a high-temperature Anthon Paar HT-1200 oven adapter. Scans were performed each 50 deg. in air. The data in dataset were already...

  • QOLAPS Quantum resources: conceptuals and applications

    Projects

    Project manager: prof. dr hab. Paweł Horodecki   Financial Program Name: 7 PROGRAM RAMOWY UE

    Project realized in Faculty of Applied Physics and Mathematics according to GA 291348 agreement from 2011-12-21

  • Universal construction of genuinely entangled subspaces of any size

    Publication

    We put forward a simple construction of genuinely entangled subspaces – subspaces supporting only genuinely multipartite entangled states – of any permissible dimensionality for any number of parties and local dimensions. The method uses nonorthogonal product bases, which are built from totally nonsingular matrices with a certain structure. We give an explicit basis for the constructed subspaces. An immediate consequence of our...

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  • QUEUE I

    Events

    26-09-2022 10:12 - 30-09-2022 10:12

    Faculty of Applied Physics and Mathematics of Gdańsk Tech invites international students to the next summer school - Quantum and Molecules I (QUEUE I), organized within the ScienceApp project.

  • DIAMDOP Domieszkowane struktury nanodiamentowe do zastosowań w sensoryce elektrochemicznej

    Projects

    Project manager: dr hab. inż. Robert Bogdanowicz   Financial Program Name: LIDER II

    Project realized in Gdańsk University of Technology according to LIDER/20/91/L-2/10/NCBiR/2011 agreement from 2011-09-01

  • Method for universal detection of two-photon polarization entanglement

    Publication
    • K. Bartkiewicz
    • P. Horodecki
    • K. Lemr
    • A. Miranowicz
    • K. Życzkowski

    - PHYSICAL REVIEW A - Year 2015

    Detecting 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 two-qubit state. Here we propose an experimental method for detecting a collective universal...

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  • Objectivity in the non-Markovian spin-boson model

    Publication

    - PHYSICAL REVIEW A - Year 2017

    Objectivity constitutes one of the main features of the macroscopic classical world. An important aspect of the quantum-to-classical 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 so-called spectrum broadcast structures. These are multipartite quantum states of the system...

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  • Monitoring of the Process of System Information Broadcasting in Time

    One of the problems of quantum physics is how a measurement turns quantum, noncopyable data, towards copyable classical knowledge. We use the quantum state discrimination in a central system model to show how its evolution leads to the broadcasting of the information, and how orthogonalization and decoherence factors allow us to monitor the distance of the state in question to the one perfectly broadcasting information, in any...

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  • Swapping Space for Time: An Alternative to Time-Domain Interferometry

    Publication

    Young's double-slit experiment [1] requires two waves produced simultaneously at two different points in space. In quantum mechanics the waves correspond to a single quantum object, even as complex as a big molecule. An interference is present as long as one cannot tell for sure which slit is chosen by the object. The more we know about the path, the worse the interference. In the paper we show that quantum mechanics allows for...

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  • Hidden Tensor Structures

    Publication

    - ENTROPY - Year 2024

    Any single system whose space of states is given by a separable Hilbert space is automatically equipped with infinitely many hidden tensor-like structures. This includes all quantum mechanical systems as well as classical field theories and classical signal analysis. Accordingly, systems as simple as a single one-dimensional harmonic oscillator, an infinite potential well, or a classical finite-amplitude signal of finite duration...

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  • Characterizing the Performance of <span class="sc">xor</span> Games and the Shannon Capacity of Graphs

    Publication

    - PHYSICAL REVIEW LETTERS - Year 2014

    In this Letter we give a set of necessary and sufficient conditions such that quantum players of a two-party xor game cannot perform any better than classical players. With any such game, we associate a graph and examine its zero-error communication capacity. This allows us to specify a broad new class of graphs for which the Shannon capacity can be calculated. The conditions also enable the parametrization of new families of games...

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  • Konzetrationslöschung durch Energieübertragung bei der Lumineszenz von Lösungen

    Publication
    • C. Bojarski
    • J. Kuśba
    • G. Obermüller

    - Year 1971

    The absorption spectra and quantum yields of the fluorescence of rhodamine 6 G are investigated in two different water-glycerol mixtures as a function of the rhodamine concentration. The observed concentration quenching is attributed to the formation of rhodamine dimers and the decrease in quantum yield is compared with theoretical concepts about concentration quenching by energy transfer to the dimers.

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  • Unconditionally blue: Curing epoxy with polyethylene glycol (PEG) surface-functionalized Zn Fe3-O4 magnetic nanoparticles

    Publication
    • M. Jouyandeh
    • S. M. Hamad
    • I. Karimzadeh
    • M. Aghazadeh
    • Z. Karami
    • V. Akbari
    • F. Shammiry
    • K. Formela
    • M. Saeb
    • Z. Ranjbar
    • M. Ganjali

    - PROGRESS IN ORGANIC COATINGS - Year 2019

    Nanoparticles govern early (chemical-controlled) and late (diffusion-controlled) stages of epoxy crosslinking, respectively. Surface functionalization of nanoparticles with macromolecules was recognized as an effective route to compensate for inadequate diffusion-controlled crosslinking. However, the effect of bulk composition amended with cations having catalytic effect towards epoxy ring opening has remained hitherto undescribed....

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  • Increased Certification of Semi-device Independent Random Numbers using Many Inputs and More Postprocessing

    Publication
    • P. A. Mironowicz
    • A. Tavakoli
    • A. Hameedi
    • B. Marques
    • M. Pawłowski
    • M. Bourennane

    - NEW JOURNAL OF PHYSICS - Year 2016

    Quantum communication with systems of dimension larger than two provides advantages in information processing tasks. Examples include higher rates of key distribution and random number generation. The main disadvantage of using such multi-dimensional quantum systems is the increased complexity of the experimental setup. Here, we analyze a not-so-obvious problem: the relation between randomness certification and computational requirements...

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  • Vibrational Quenching of Optically Pumped Carbon Dimer Anions

    Publication
    • M. Nötzold
    • R. Wild
    • C. Lochmann
    • T. Rahim
    • S. P. Melath
    • K. Dulitz
    • B. P. Mant
    • J. Franz
    • F. A. Gianturco
    • R. Wester

    - PHYSICAL REVIEW LETTERS - Year 2023

    Careful control of quantum states is a gateway to research in many areas of science such as quantum information, quantum-controlled chemistry, and astrophysical processes. Precise optical control of molecular ions remains a challenge due to the scarcity of suitable level schemes, and direct laser cooling has not yet been achieved for either positive or negative molecular ions. Using a cryogenic wire trap, we show how the internal...

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  • Entangled rendezvous: a possible application of Bell non-locality for mobile agents on networks

    Publication

    Rendezvous is an old problem of assuring that two or more parties, initially separated, not knowing the position of each other, and not allowed to communicate, are striving to meet without pre-agreement on the meeting point. This problem has been extensively studied in classical computer science and has vivid importance to modern and future applications. Quantum non-locality, like Bell inequality violation, has shown that in many...

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  • Probing Local Structural Changes by Sharp Luminescent Infrared Nanophosphor for Application in Light-Emitting Diodes

    Publication
    • D. Kreft
    • S. Mahlik
    • N. Majewska
    • M. Fang
    • H. Jia-yu
    • R. Chung
    • S. Hwo-shuenn
    • L. Jyh-fu

    - CHEMISTRY OF MATERIALS - Year 2022

    Cr3+-doped infrared phosphors are promising candidates for next-generation phosphor-converted infrared light-emitting diodes (LEDs) because they can, in principle, tune and convert the luminescence spectra from an LED chip. However, most studies focus on broad-band Cr3+-doped phosphors, and the control mechanism of Cr3+-doped phosphors with sharp line emissions remains ambiguous. Here, we report LiGa5(1–x)Al5xO8:Cr3+ phosphors...

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  • UAV Survey Images - 3D Model - Zukowo Church

    Open Research Data
    open access - series: UAV Survey Images

    Dataset description: Raw images from photogrammetric survey. Object: Parafia Wniebowzięcia Najświętszej Maryi Panny w ŻukowieLocation: Żukowo, Pomorskie, Kartuski County, PolandDrone type: DJI Mavic Pro.Flight plan: CircleTarget Product: 3D ModelDate: 21.04.2018Direct georeferencing: yesMetadata data: yes/GPSGCP: NoGCP: No Camera Name: DJI FC220Model...

  • UAV Survey Images - orthophotomap - Zukowo City

    Open Research Data
    open access - series: UAV Survey Images

    Dataset description: Raw images from photogrammetric survey.Location: Żukowo, Pomorskie, Kartuski County, PolandDrone type: DJI Mavic Pro.Flight plan: Single gridTarget Product: OrthophotomapDate: 22.04.2018Direct georeferencing: yesMetadata data: yes/GPSGCP: yes (description and location in file)\GCP: RTK Camera Name: DJI FC220Model type: PerspectiveImage...

  • Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3-delta SOFC anodes

    In order to find a relationship between structural and electrical properties, niobium and yttrium doped SrTiO3 ceramics were prepared via solid-state reaction. The samples were sintered in hydrogen and air conditions. The samples were also fabricated with a pore-former to obtain highly porous specimens. The electrical properties of Nb-doped SrTiO3 samples and yttrium and niobium co-doped SrTiO3 were compared. The comparable electrical...

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  • Jerzy Konorski dr hab. inż.

    Jerzy Konorski received his M. Sc. degree in telecommunications from Gdansk University of Technology, Poland, and his Ph. D. degree in computer science from the Polish Academy of Sciences, Warsaw, Poland. In 2007, he defended his D. Sc. thesis at the Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology. He has authored over 150 papers, led scientific projects funded by the European Union,...

  • Bound on Bell inequalities by fraction of determinism and reverse triangle inequality

    Publication
    • P. Joshi
    • K. Horodecki
    • M. Horodecki
    • P. Horodecki
    • R. Horodecki
    • B. Li
    • S. Szarek
    • T. Szarek

    - PHYSICAL REVIEW A - Year 2015

    It 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...

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  • Bell-Type Inequalities from the Perspective of Non-Newtonian Calculus

    Publication

    A class of quantum probabilities is reformulated in terms of non-Newtonian calculus and projective arithmetic. The model generalizes spin-1/2 singlet state probabilities discussed in Czachor (Acta Physica Polonica:139 70–83, 2021) to arbitrary spins s. For s → ∞ the formalism reduces to ordinary arithmetic and calculus. Accordingly, the limit “non-Newtonian to Newtonian” becomes analogous to the classical limit of a quantum theory

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  • Towards Resource Theory of Coherence in Distributed Scenarios

    Publication

    - Physical Review X - Year 2017

    The search for a simple description of fundamental physical processes is an important part of quantum theory. One example for such an abstraction can be found in the distance lab paradigm: if two separated parties are connected via a classical channel, it is notoriously difficult to characterize all possible operations these parties can perform. This class of operations is widely known as local operations and classical communication....

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  • Effect of Cr and Mn doping on ferroelectric and dielectric properties of Li1.72Na0.28Ge4O9 single crystals

    Publication

    - PHASE TRANSITIONS - Year 2013

    Li1.72Na0.28Ge4O9 single crystals pure and slightly doped with chromium and manganese, obtained by Czochralski growth, were investigated for their ferroelectric and dielectric properties. The change in stoichometry of Li2− x Na x Ge4O9 (x = 0.28) crystals doped with Cr and Mn (0.1 mol.%) had an influence on the value of ferroelectric-to-paraelectric phase transition temperature, T c. The applied doping affects the T c value by...

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  • Low-Coherence Interferometer with Nanocrystalline Diamond Films with Potential Application to Measure Small Biological Samples

    The study investigates a case of a low-coherence fiber-optic Fabry–Prerot interferometer with a nanocrystalline diamond (NCD) mirror. The method of achieving double density of interference fringes is proposed by the application of birefringent material in the cavity of the interferometer. It can be used to reduce sample volume in comparison to conventional interferometers. The use of a biocompatible diamond mirror makes it specifically...

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  • On thermal stability of topological qubit in Kitaev's 4D model

    Publication

    - OPEN SYSTEMS & INFORMATION DYNAMICS - Year 2010

    We analyse stability of the four-dimensional Kitaev model-a candidate for scalable quantum memory - in finite temperature within the weak coupling Markovian limit. It is shown that, below a critical temperature, certain topological qubit observables X and Z possess relaxation times exponentially long in the size of the system. Their construction involves polynomial in system size algorithm which uses as an input the results of...

  • Collective Uncertainty Entanglement Test

    Publication

    - PHYSICAL REVIEW LETTERS - Year 2011

    For a given pure state of a composite quantum system we analyze the product of its projections onto aset of locally orthogonal separable pure states. We derive a bound for this product analogous to theentropic uncertainty relations. For bipartite systems the bound is saturated for maximally entangled statesand it allows us to construct a family of entanglement measures, we shall call collectibility. As thesequantities are experimentally...

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  • Progress towards a unified approach to entanglement distribution

    Publication

    - PHYSICAL REVIEW A - Year 2015

    Entanglement 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...

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  • NO-BROADCASTING OF NON-SIGNALLING BOXES VIA OPERATIONS WHICH TRANSFORM LOCAL BOXES INTO LOCAL ONES

    Publication
    • P. Joshi
    • A. Grudka
    • K. Horodecki
    • M. Horodecki
    • P. Horodecki
    • R. Horodecki

    - QUANTUM INFORMATION & COMPUTATION - Year 2013

    We deal with families of probability distributions satisfying non-signalling condition, called non-signalling boxes and consider a class of operations that transform local boxes into local ones (the one that admit LHV model). We prove that any operation from this class cannot broadcast a bipartite non-local box with 2 binary inputs and outputs. We consider a function called anti-Robustness which can not decrease under these operations....

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  • Shrinking-shifting and amplifying-shifting device using transformation optics

    Publication

    - OPTICAL AND QUANTUM ELECTRONICS - Year 2022

    Based on transformation optics (TO), this paper uses geometric divisions and linear coordinate transformations to design “shrinking-shifting—and reshaping”, and “amplifying-shifting—and reshaping” devices. The proposed devices can reshape the sizes and locations of the wrapped-objects inside the core-region. The shrinking-shifting device shrinks the larger object into a smaller one and shifts it to different location, whereas the...

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  • Lattice-commensurate skyrmion texture in a centrosymmetric breathing kagome magnet

    Publication
    • M. Hirschberger
    • B. G. Szigeti
    • M. Hemmida
    • M. M. Hirschmann
    • S. Esser
    • H. Ohsumi
    • Y. Tanaka
    • L. Spitz
    • S. Gao
    • K. Kolincio... and 8 others

    - npj Quantum Materials - Year 2024

    Skyrmion lattices (SkL) in centrosymmetric materials typically have a magnetic period on the nanometer-scale, so that the coupling between magnetic superstructures and the underlying crystal lattice cannot be neglected. We reveal the commensurate locking of a SkL to the atomic lattice in Gd3Ru4Al12 via high-resolution resonant elastic x-ray scattering (REXS). Weak easy-plane magnetic anisotropy, demonstrated here by a combination...

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  • The role of low-energy electrons in the charging process of LISA test masses

    Publication
    • S. Taioli
    • M. Dapor
    • F. Dimiccoli
    • M. Fabi
    • V. Ferroni
    • C. Grimani
    • M. Villani
    • W. J. Weber

    - CLASSICAL AND QUANTUM GRAVITY - Year 2023

    The estimate of the total electron yield is fundamental for our understanding of the test-mass charging associated with cosmic rays in the Laser Interferometer Space Antenna (LISA) Pathfinder mission and in the forthcoming gravitational wave observatory LISA. To unveil the role of low energy electrons in this process owing to galactic and solar energetic particle events, in this work we study the interaction of keV and sub-keV...

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  • Karolina Lademann mgr

    People

    Curriculum vitae

  • Al-DIAMOND SCHOTTKY TUNNEL DIODES WITH BARRIER HEIGHT CONTROL

    Publication

    - Year 2013

    Few-nanometer-thick very highly boron-doped p-type layers were fabricated at metal-semiconductor interfaces of Schottky barrier diodes formed with aluminum on polycrystalline diamond. Preliminary results show that hermionically-assisted tunneling mechanism results in lower voltage drops at forward biasing of these diodes than expected for the Al-diamond metal-semiconductor potential barrier B. The effective barrier height Bpeff...

  • SEM images of SFM, LSFM and SFMNb in as-prepared state and reduced

    Open Research Data
    embargo - series: SFM

    This dataset contains SEM images taken for pristine strontium ferrite molybdate, as well as ones doped with lanthanum or niobium. Materials were characterized in powder, under high vacuum in secondary electron mode. The images are divided into folders for as-prepared samples and reduced (H2, 800 deg, 4 h) ones. 

  • Refined theoretical study of radiative association: Cross sections and rate constants for the formation of SiN

    Publication
    • M. Gustafsson
    • S. Antipov
    • J. Franz
    • G. Nyman

    - JOURNAL OF CHEMICAL PHYSICS - Year 2012

    Radiative association of silicon mononitride (SiN) in its two lowest molecular electronic states is studied through quantum and classical dynamics. Special attention is paid to the behavior of the cross section at high collision energies. A modified expression for the semiclassical cross section is presented which excludes transitions to continuum states. This gives improved agreement with quantum mechanical perturbation theory...

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  • Teleportation of geometric structures in 3D

    The simplest quantum teleportation algorithms can be represented in geometric terms in spaces of dimensions 3 (for real state vectors) and 4 (for complex state vectors). The geometric representation is based on geometric-algebra coding, a geometric alternative to the tensor-product coding typical of quantum mechanics. We discuss all the elementary ingredients of the geometric version of the algorithm: geometric analogs of states...

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  • XPS analysis of strontium titanate ceramics

    Open Research Data
    open access

    The chemical composition of the strontium titanite doped with yttrium and iron ceramic samples was investigated. Samples of Y0.07Sr0.93Ti0.8Fe0.2 were prepared by solid phase reaction and sintered for 24 and 48 hours. Chemical composition was measured by UHV OmicronNanotechnology XPS system.  The analysis confirmed the chemical composition of the ceramics...

  • Linear game non-contextuality and Bell inequalities—a graph-theoretic approach

    Publication

    - NEW JOURNAL OF PHYSICS - Year 2016

    We study the classical and quantum values of a class of one-and two-party unique games, that generalizes the well-known XOR games to the case of non-binary outcomes. In the bipartite case the generalized XOR(XOR-d) games we study are a subclass of the well-known linear games. We introduce a 'constraint graph' associated to such a game, with the constraints defining the game represented by an edge-coloring of the graph. We use the...

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  • Optical measurements of LTO:Cu sol-gel derived thin films

    Open Research Data
    open access

    Lithium titanate doped by copper thin films were manufactured by chemical, sol-gel method. Flms were deposited on a Corning glass substrated by spin coater. To calculated optical band gap and other optcal parameters, UV-VIS spectroscopy measurements were performed. For measurements selected samples with various content of Cu.

  • Morphology of the sol-gel derived LTO:Cu films

    Open Research Data
    open access

    Morphology of the lithium titanate doped by Cu thin films were investigated by SEM microscope. Films were deposited by spin-coater from sol-gel derived sol. SEM images showed a high porous structure, tipaciall for sol-gel based films. For measurements samples with a various content of Cu were selected.

  • Obrony prac doktorskich na Wydziale Chemicznym

    Events

    26-04-2022 08:30 - 26-04-2022 11:30

    Dn. 26.04.2022 r. o godz. 8.30 w Audytorium 1.4 Wydziału Chemicznego PG (budynek nr 5) odbędzie się w trybie hybrydowym obrona pracy doktorskiej mgr inż. Karoliny Grajewskiej.

  • Robust amplification of Santha-Vazirani sources with three devices

    Publication

    - PHYSICAL REVIEW A - Year 2015

    We 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....

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  • Sol-gel derived TeO2:RE powders

    Open Research Data
    open access

    Tellurium dioxide powders doped by Europium or Dysprosium were prepared by sol-gel method. Samples were annealed in ix of Ar and O2 atomosphere at 600 degrees. Presence of rare earth dopants and Te4+ phase was confirmed by X-Ray Photoemission Spectroscopy method (XPS). For XPS measurements samples with 1 atomic % and 5 atomic % of dopand were selected.

  • PHOTON LUMINESCENCE STUDIES OF TETRAHYDROFURAN FOLLOWING TRIHYDROGEN CATIONS IMPACT IN THE 20–1000 EV ENERGY RANGE

    Publication

    Photon emission arising during tetrahydrofuran (C4H8O, THF) fragmentation initiated by H3 + ion impact has been studied experimentally. Luminescence fragmentation spectra and the relative emission cross-sections of the excited fragments have been measured using collision-induced emission spectroscopy in the 20–1000 eV energy range. The main features in the spectra are the H Balmer series lines, whose intensities decrease with increasing...

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