A5011840878- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Biofield Effects and Biophysics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Quantum many-body systems
- Particle physics theoretical and experimental studies
- Quantum optics and atomic interactions
- Neutrino Physics Research
- Particle Detector Development and Performance
- Noncommutative and Quantum Gravity Theories
- Advanced MRI Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Quantum and electron transport phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Radiation Therapy and Dosimetry
- Statistical Mechanics and Entropy
- Astrophysics and Cosmic Phenomena
University of Vienna
2016-2025
National Centre for Nuclear Research
2022-2023
University of Łódź
2022
AREA Science Park
2015
Masaryk University
2012-2013
Slovak Academy of Sciences
2010-2011
Institute of Physics of the Slovak Academy of Sciences
2011
Sofia University "St. Kliment Ohridski"
2010
Universitat Autònoma de Barcelona
2003-2008
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2008
We investigate correlations among complementary observables. In particular, we show how to take advantage of mutually unbiased bases (MUBs) for the efficient detection entanglement in arbitrarily high-dimensional, multipartite and continuous variable quantum systems. The introduced criteria are relatively easy implement experimentally since they require only a few local measurement settings. addition, establish link between separability problem maximum number -- opening new avenue this...
A detection system of the conventional PET tomograph is set-up to record data from e+ e- annihilation into two photons with energy 511 keV, and it gives information on density distribution a radiopharmaceutical in body object. In this paper we explore possibility performing three gamma imaging based ortho-positronium annihilation, as well positronium mean lifetime J-PET constructed plastic scintillators. For purposes simulations formation its were performed taking account distributions...
The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET built from plastic scintillators.J-PET prototype consists of 192 detection modules arranged axially in three layers forming a cylindrical diagnostic chamber with inner diameter 85 cm and axial field-of-view 50 cm.An arrangement long strips scintillators, their small light attenuation, superior timing properties, relative ease increase opens promising perspectives for cost effective construction whole-body scanner, as well...
Positronium created in a human body during PET scans hallmarks neoplastic tissues.
We derive a general framework to identify genuinely multipartite entangled mixed quantum states in arbitrary-dimensional systems and show exemplary cases that the constructed criteria are stronger than those previously known. Our simple functions of given state detect genuine entanglement had not been identified so far. They experimentally accessible without tomography easily computable as no optimization or eigenvalue evaluation is needed.
The novel whole-body PET system based on plastic scintillators is developed by the {J-PET} Collaboration. It consists of scintillator strips arranged axially in form a cylinder, allowing cost-effective construction total-body PET. In order to determine properties scanner prototype and optimize its geometry, advanced computer simulations using GATE software were performed. spatial resolution, sensitivity, scatter fraction noise equivalent count rate estimated according NEMA norm as function...
Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron-positron bound state (positronium atom) motivate further investigation, including fundamental tests. While CPT noninvariance effects could be manifested non-vanishing angular correlations between final-state photons spin of annihilating positronium, measurements were...
The purpose of the presented research is estimation performance characteristics economic Total-Body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. are estimated according to NEMA NU-2-2018 standards utilizing GATE package. simulated detector consists 24 modules, each built out 32 scintillator strips (each with cross section 6 mm times 30 and length 140 cm or 200 cm) arranged in two layers regular 24-sided polygon circumscribing a circle diameter 78.6 cm. For...
Discrete symmetries play an important role in particle physics with violation of CP connected to the matter-antimatter imbalance Universe. We report most precise test P, T and invariance decays ortho-positronium, performed methodology involving polarization photons from these decays. Positronium, simplest bound state electron positron, is recent interest discrepancies reported between measured hyperfine energy structure theory at level $10^{-4}$ signaling a need for better understanding...
We investigate the state space of bipartite qutrits. For states which are locally maximally mixed we obtain an analog ``magic'' tetrahedron for qubits---a magic simplex $\mathcal{W}$. This is obtained via Weyl group a kind ``quantization'' classical phase space. analyze how this $\mathcal{W}$ embedded in whole two qutrits and discuss symmetries equivalences inside Because explicitly able to construct optimal entanglement witnesses border between separable entangled states. With our method...
We describe the spin and momentum degrees of freedom a system two massive spin-$\frac{1}{2}$ particles as four-qubit system. Then we explicitly show how entanglement changes between different partitions qubits, when considered by inertial observers. Although particle corresponding to partition into Alice's Bob's subsystems is, often stated in literature, invariant under Lorentz boosts, with respect other Hilbert space on hand, is not. It certainly does depend chosen frame initial state...
In this paper, new upper limits on the parameters of Continuous Spontaneous Localization (CSL) collapse model are extracted. To end, X-ray emission data collected by IGEX collaboration analyzed and compared with spectrum spontaneous photon process predicted models. This study allows obtainment most stringent within a relevant range CSL parameters, respect to any other method. The rate $λ$ correlation length $r_C$ mapped, thus allowing exclusion broad parameter space.
Quantum entanglement shared between more than two particles is essential to foundational questions in quantum mechanics, and upcoming information technologies. So far, up 14 two-dimensional qubits have been entangled, an open question remains if one can also demonstrate of higher-dimensional discrete properties particles. A promising route the use photon orbital angular momentum (OAM), which enables implementation novel protocols, study fundamentally new states. To date, only such...
A novel approach to tomographic data processing has been developed and evaluated using the Jagiellonian PET (J-PET) scanner as an example. We propose a system in which there is no need for powerful, local facility, capable reconstruct images on fly. Instead we introduce Field Programmable Gate Array (FPGA) System-on-Chip (SoC) platform connected directly streams coming from scanner, can perform event building, filtering, coincidence search Region-Of-Response (ROR) reconstruction by...
Entanglement and its consequences - in particular the violation of Bell inequalities, which defies our concepts realism locality have been proven to play key roles Nature by many experiments for various quantum systems. can also be found systems not consisting ordinary matter light, i.e. massive meson--antimeson inequalities discussed these systems, but up date no direct experimental test conclusively exclude local was found. This mainly stems from fact that one only has access a restricted...
We present a study of the application Jagiellonian positron emission tomograph (J-PET) for registration gamma quanta from decays ortho-positronium (o-Ps). The J-PET is first tomography scanner based on organic scintillators in contrast to all current PET scanners inorganic crystals. Monte Carlo simulations show that as an axially symmetric and high acceptance can be used multi-purpose detector well suited pursue research including e.g. tests discrete symmetries addition medical imaging....
In living organisms, the positron-electron annihilation (occurring during PET imaging) proceeds in about 30% via creation of a metastable ortho-positronium atom. tissue, due to pick-off and conversion processes, over 98% ortho-positronia annihilate into two 511 keV photons. this article, we assess feasibility for reconstruction mean lifetime image based on annihilations The main objectives work include (i) estimation sensitivity total-body scanners imaging using 2γ (ii) spatial time...
We investigate Bell inequalities for neutral kaon systems from $\ensuremath{\Phi}$ resonance decay to test local realism versus quantum mechanics. emphasize the unitary time evolution of states, which means we also include all product in contrast other authors. Only this guarantees use complete Hilbert space. develop a general formalism including both arbitrary ``quasispin'' states and different times; finally, analyze Wigner-type inequalities. They contain an additional term, correction...
We consider an open quantum system which contains unstable states. The time evolution of the can be described by effective non-hermitian Hamiltonian H_{eff}, in accord with Wigner--Weisskopf approximation, and additional term Lindblad form, socalled dissipator. show that, after enlarging original Hilbert space states represent decay products states, part H_{eff} --the ``particle decay''-- incorporated into dissipator enlarged via a specific operator. Thus new formulation on has hermitian is...
J-PET is a detector optimized for registration of photons from the electron-positron annihilation via plastic scintillators where interact predominantly Compton scattering. Registration both primary and scattered enables to determinate linear polarization photon on event by basis with certain probability. Here we present quantitative results feasibility such measurements decay positronium explore physical limitations resolution determination 511 keV For scattering angles about 82 ∘ (where...
Abstract Background Total‐body (TB) Positron Emission Tomography (PET) is one of the most promising medical diagnostics modalities, opening new perspectives for personalized medicine, low‐dose imaging, multi‐organ dynamic imaging or kinetic modeling. The high sensitivity provided by total‐body technology can be advantageous novel tomography methods like positronium demanding registration triple coincidences. Currently, state‐of‐the‐art PET scanners use inorganic scintillators. However,...
Uncontrolled interactions with the environment introduce errors that remain a significant challenge to reliability of quantum technologies using entanglement. An essential method overcome or mitigate these is entanglement distillation, transformation multiple copies weakly entangled states into smaller number approximately maximally states. We present comparative analysis stabilizer-based two-copy distillation protocol, FIMAX, against other recurrent protocols, including ADGJ, DEJMPS, P1-P2,...
Combining machine learning and quantum computation is a potential path towards powerful applications on devices. Regarding this, neural networks are prominent approach. In this work, we present novel architecture for dissipative (DQNNs) in which each building block can implement any channel, thus introducing clear notion of universality suitable the framework. To end, reformulate DQNNs using isometries instead conventionally used unitaries, thereby reducing number parameters these models. We...
<title>Abstract</title> Two approaches can be utilized to handle the separability problem, finding out whether a given bipartite qudit state is separable or not: direct procedure on space effective tool of entanglement witnesses (EWs). This contribution studies structure EWs. Exploiting very concept mirrored EWs, increasing detection power, we show, in contrast conjecture recent paper (Sci. Rep. 13, 10733 (2023)), there exist pairs optimal which are both non-decomposible, i.e. detect...