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Wyszukujesz frazę "quantum" wg kryterium: Wszystkie pola


Tytuł:
Extending scientific computing system with structural quantum programming capabilities
Autorzy:
Gawron, P.
Klamka, J.
Miszczak, J.
Winiarczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/199942.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum information
quantum programming
models of quantum computation
Opis:
We present the basic high-level structures used for developing quantum programming languages. The presented structures are commonly used in many existing quantum programming languages and we use quantum pseudo-code based on QCL quantum programming language to describe them. We also present the implementation of introduced structures in GNU Octave language for scientific computing. Procedures used in the implementation are available as a package quantum-octave providing library of functions, which facilitates the simulation of quantum computing. This package allows also to incorporate high-level programming concepts into the simulation in GNU Octave and Matlab. As such it connects features unique for higl-level quantum programming languages, with the full palette of efficient computational routines commonly available in modern scientific computing systems. To present the major features of the described package we provide the implementation of selected quantum algorithms. We also show how quantum errors can be taken into account during the simulation of quantum algorithms using quantum-octave package. This is possible thanks to the ability to operate on density matrices implemented in quantum-octave.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 77-88
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum simulation of the tunnel effect
Autorzy:
Ostrowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/201242.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum computations
quantum simulations
tunnel effect
obliczenia kwantowe
symulacje kwantowe
efekt tunelowy
Opis:
In this paper, we examine whether a quantum computer can efficiently simulate quantum processes such as the tunnel effect. We examine a quantum algorithm that calculates the value of transition and reflection coefficients for the Gaussian wave packet scattered on a rectangular potential. We compare the results obtained in this way with the results of classical simulations and analytical calculations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 379-383
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realization of controlled NOT quantum gate via control of a two spin system
Autorzy:
Twardy, M.
Olszewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/201766.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum gates control
CNOT gate
quantum control
Opis:
Physical realization of controlled NOT quantum gate is addressed as a control problem for the system of two interacting spins. The control is carried out by magnetic pulses acting on the spins. The shapes of the appropriate magnetic pulses are computed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 379-390
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiquantum authentication of users resistant to multisession attacks
Autorzy:
Zawadzki, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2086855.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum cryptography
quantum identity authentication
semi-quantum communication
kryptografia kwantowa
kwantowe uwierzytelnianie tożsamości
komunikacja półkwantowa
Opis:
User authentication is an essential element of any communication system. The paper investigates the vulnerability of the recently published first semiquantum identity authentication protocol (Quantum Information Processing 18: 197, 2019) to the introduced herein multisession attacks. The impersonation of the legitimate parties by a proper combination of phishing techniques is demonstrated. The improved version that closes the identified loophole is also introduced.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137729, 1--7
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of quantum computation and quantum programming languages
Autorzy:
Miszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/200159.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
programming languages
models of computation
Turing machine
Opis:
The goal of the presented paper is to provide an introduction to the basic computational models used in quantum information theory. We review various models of quantum Turing machine, quantum circuits and quantum random access machine (QRAM) along with their classical counterparts. We also provide an introduction to quantum programming languages, which are developed using the QRAM model. We review the syntax of several existing quantum programming languages and discuss their features and limitations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 305-324
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the Schrödinger particle non-elastic scattering with emission of photon in the quantum register
Autorzy:
Ostrowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200499.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum simulations
nonelastic scattering
Schrödinger particle
Opis:
This paper investigates whether a quantum computer can efficiently simulate the non-elastic scattering of the Schrödinger particle on a stationary excitable shield. The return of the shield to the ground state is caused by photon emission. An algorithm is presented for simulating the time evolution of such a process, implemented on standard two-input gates. The algorithm is used for the computation of elastic and non-elastic scattering probabilities. The results obtained by our algorithm are compared with those obtained using the standard Cayley’s method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1217-1225
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GPU-based tuning of quantum-inspired genetic algorithm for a combinatorial optimization problem
Autorzy:
Nowotniak, R.
Kucharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/201268.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum-inspired genetic algorithm
evolutionary computing
meta-optimization
parallel algorithms
GPGPU
Opis:
This paper concerns efficient parameters tuning (meta-optimization) of a state-of-the-art metaheuristic, Quantum-Inspired Genetic Algorithm (QIGA), in a GPU-based massively parallel computing environment (NVidia CUDATMtechnology). A novel approach to parallel implementation of the algorithm has been presented. In a block of threads, each thread transforms a separate quantum individual or different quantum gene; In each block, a separate experiment with different population is conducted. The computations have been distributed to eight GPU devices, and over 400× speedup has been gained in comparison to Intel Core i7 2.93GHz CPU. This approach allows efficient meta-optimization of the algorithm parameters. Two criteria for the meta-optimization of the rotation angles in quantum genes state space have been considered. Performance comparison has been performed on combinatorial optimization (knapsack problem), and it has been presented that the tuned algorithm is superior to Simple Genetic Algorithm and to original QIGA algorithm.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 323-330
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmitter with quantum cascade laser for free space optics communication system
Autorzy:
Gutowska, M.
Pierścińska, D.
Nowakowski, M.
Pierciński, K.
Szabra, D.
Mikołajczyk, J.
Wojtas, J.
Bielecki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/200097.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical link
quantum cascade laser
laser communications
Opis:
The paper presents results of experimental tests of the quantum cascade laser from Alpes Lasers company in terms of its application in the optic communication system in an open space. The measurements involved the current – voltage characteristics while measuring also the average power of emitted radiation, and spectral characteristics for different temperatures and different laser pulse durations. The duration of laser pulses was matched to parameters used in telecommunication interfaces. The construction of the transmitter module which uses the tested laser is also presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 419-423
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaAs/AlGaAs (~9.4 žm) quantum cascade lasers operating at 260 K
Autorzy:
Bugajski, M.
Kosiel, K.
Szerling, A.
Kubacka-Traczyk, J.
Sankowska, I.
Karbownik, P.
Trajnerowicz, A.
Pruszy, E.
Pierciński, K.
Pierścińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/200656.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum cascade lasers
pulsed mode
Opis:
The fabrication of Quantum Cascade Lasers (QCLs) emitting at 9.4 um is reported. The devices operated in pulsed mode at up to 260 K. The peak powers recorded in 77 K were over 1 W, and the slope efficiency 0.5–0.6 W/A per uncoated facet. This has been achieved by the use of GaAs/Al0.45Ga0.55As heterostructure, with 3QW anticrossed-diagonal design originally proposed by Page et al. [1]. Double plasmon planar confinement with Al-free waveguide has been used to minimize absorption losses. The double trench lasers were fabricated using standard processing technology, i.e., wet etching and Si3N4 for electrical insulation. The QCL structures have been grown by Molecular Beam Epitaxy (MBE), with Riber Compact 21T reactor. The stringent requirements – placed particularly on the epitaxial technology – and the influence of technological conditions on the device structure properties are presented and discussed in depth.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 471-476
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of performance limits of the HOT HgCdTe photodiodes with colloidal quantum dot infrared detectors
Autorzy:
Rogalski, A.
Kopytko, M.
Martyniuk, P.
Hu, W.
Powiązania:
https://bibliotekanauki.pl/articles/201444.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
colloidal quantum dot infrared photodetectors
HOT infrared detectors
HgCdTe photodiodes
p-i-n depleted photodiodes
BLIP performance
Opis:
In the past decade, there has been significant progress in development of the colloidal quantum dot (CQD) photodetectors. The QCD’s potential advantages include: cheap and easy fabrications, size-tuneable across wide infrared spectral region, and direct coating on silicon electronics for imaging, which potentially reduces array cost and offers new modifications like flexible infrared detectors. The performance of CQD high operating temperature (HOT) photodetectors is lower in comparison with detectors traditionally available on the global market (InGaAs, HgCdTe and type-II superlattices). In several papers their performance is compared with the semiempirical rule, “Rule 07” (specified in 2007) for P-on-n HgCdTe photodiodes. However, at present stage of technology, the fully-depleted background limited HgCdTe photodiodes can achieve the level of room-temperature dark current considerably lower than predicted by Rule 07. In this paper, the performance of HOT CQD photodetectors is compared with that predicted for depleted P-i-N HgCdTe photodiodes. Theoretical estimations are collated with experimental data for both HgCdTe photodiodes and CQD detectors. The presented estimates provide further encouragement for achieving low-cost and high performance MWIR and LWIR HgCdTe focal plane arrays operating in HOT conditions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 845-855
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compact QCL driver for free-space transmitter
Autorzy:
Mikołajczyk, J.
Garlińska, M.
Wesołowski, M.
Wojtas, J.
Bielecki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/201659.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
free space optics
laser communication
quantum cascade lasers
laser driver
Opis:
The paper presents investigations of a free space optical transmitter operating with quantum cascade lasers. The main goal of the research was to determine influence of lasers driver parameters on an optical data link performance. Using some commercial driving devices, the laser pulse limitations of power, repetition rate and time duration have been observed. In the paper, the preliminary results of the designed laser driver are described. The driver was developed at the Institute of Optoelectronics, MUT in cooperation with scientists from the Faculty Electrical Engineering, WUT. It is characterized by high current efficiency, high pulse repetition rate, and compact construction. Additionally, the driver also includes a controller of Peltier modules
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 763-768
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaInNAs quantum-well vertical-cavity surface-emitting lasers emitting at 2.33 μm
Autorzy:
Piskorski, Ł.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/199958.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation of a diode-laser operation
QW VCSELs
mid-infrared radiation
dilute nitrides
Opis:
In the present paper, the comprehensive fully self-consistent optical-electrical-thermal-recombination model is used to determine the optimal structure of the possible GaInNAs quantum-well (QW) tunnel-junction (TJ) vertical-cavity surface-emitting lasers (VCSELs) with single-fundamental-mode operation at 2.33 μm wavelength suited for carbon monoxide sensing applications. From among various considered structures, the diode laser with 4-μm TJ and two 6-nm Ga0.15In0.85N0.015As0.985/Ga0.327In0.673As0.71P0.29 QWs has the lowest threshold current and seems to be optimal for the above applications. Higher threshold currents are obtained for Ga0.15In0.85N0.015As0.985/Al0.138 -Ga0.332In0.530As QW structures but the latter can be grown in reactors without P source which are used for fabrication of GaAs-based devices. Both the modelled VCSELs offer a very promising room temperature continuous wave performance and may represent an alternative choice to GaSb-based lasers.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 737-744
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of QKD multifactor authentication in online banking systems
Autorzy:
Sharma, A.
Lenka, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/953056.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
online banking
authentication
multi-factor authentication
quantum cryptography
QKD
security
bankowość internetowa
uwierzytelnianie
uwierzytelnianie wieloczynnikowe
kryptografia kwantowa
bezpieczeństwo
Opis:
In the present scenario internet usage and the online banking sectors are experiencing spectacular growth. The Internet is the fastest growing banking channel today, both in the fields of corporate and retail banking. Banks prefer their customers to use the online banking facility as it reduces their cost, primarily through labour costs. The online banking system addresses several emerging trends: customers’ demand for anytime, anywhere service, product time-to-market imperatives and increasingly complex back-office integration challenges. Online fraud has become major source of revenue for criminals all over the globe. The challenges that oppose online banking are the concerns of security and privacy of information. This has made detecting and preventing these activities a top priority for every major bank. The use of single-factor authentication, such as a user name and the password, has been inadequate for guarding against account fraud and identity theft, in sensitive online banking systems. In this paper we are going to analyze the QKD multifactor authentication in online banking systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 545-548
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical interpretation of the Cosserat mechanics for a collection of atoms
Autorzy:
Sikoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/201587.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cosserat theory polar atom
mechanical quantum number
statistical mechanics
condensed matter
atom
mechanika kwantowa
mechanika statystyczna
materia skondensowana
teoria ośrodka Cosseratów
Opis:
In this work, the Cosserat medium is analyzes as a set of atoms. These atoms are under the action of a mechanical load. The statistical analysis is preceded by a description of a single atom using classical mechanics and quantum mechanics. The behavior of the atoms in the field generated by mechanical change of the interatomic distance is shown as a phenomenon which can explain the Cosserat mechanics in a continuum.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 333-338
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of quantum cascade lasers to trace gas detection
Autorzy:
Bielecki, Z.
Stacewicz, T.
Wojtas, J.
Mikołajczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/201703.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
absorption spectroscopy
biomarkers
sensors
gas sensors
cavity enhanced spectroscopy
photoacoustic spectroscopy
spektroskopia absorpcyjna
biomarkery
czujniki gazu
spektroskopia wzmocniona
spektroskopia fotoakustyczna
Opis:
The potential of Quantum Cascade Laser technology has been recently harnessed in industry, medicine and military to create a range of original infrared gas sensors. These sensors have opened up many new applications due to compact size, excellent sensitivity, robust construction and low power requirements. They rely on infrared absorption spectroscopy to determine identity and quantity of gases. The measurement of these gases has relied on different technologies including multi-pass spectroscopy, photoacoustic spectroscopy, cavity ring down spectroscopy, and their various modifications. In this review paper some technologies are described in terms of its advantages/disadvantages in many application. The results of own works about methane, ammonia, nitric oxide, nitrous oxide, and carbonyl sulfide detection are presented as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 515-525
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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