The study of amplitude and phase relaxation impact on the quality of quantum information technologies

The influence of amplitude and phase relaxation on evolution of quantum states within the formalism of quantum operations is considered. The model of polarizing qubits where noises are determined by the existence of spectral degree of freedom that shows up during the light propagation inside anisotropic mediums with dispersion is studied. Approximate analytic model for calculation of phase plate impact on polarizing state with dispersion influence taken into consideration is suggested.Comment: 7 pages, 4 figures, report for the International Symposium "Quantum Informatics-2014" (QI-2014), Zvenigorod, Moscow region, October 06-10, 201

Numerical and analytical research of the impact of decoherence on quantum circuits

Three different levels of noisy quantum schemes modeling are considered: vectors, density matrices and Choi-Jamiolkowski related states. The implementations for personal computers and supercomputers are described, and the corresponding results are shown. For the level of density matrices, we present the technique of the fixed rank approximation and show some analytical estimates of the fidelity level.Comment: 11 pages, 9 figures, report for the International Symposium "Quantum Informatics-2014" (QI-2014), Zvenigorod, Moscow region, October 06-10, 201

High-precision tomography of ion qubits based on registration of fluorescent photons

We develop a new method for high-precision tomography of ion qubit registers under conditions of limited distinguishability of its logical states. It is not always possible to achieve low error rates during the readout of the quantum states of ion qubits due to the finite lifetime of excited levels, photon scattering, dark noise, low numerical aperture, etc. However, the model of fuzzy quantum measurements makes it possible to ensure precise tomography of quantum states. To do this, we developed a fuzzy measurement model based on counting the number of fluorescent photons. A statistically adequate algorithm for the reconstruction of quantum states of ion qubit registers based on fuzzy measurement operators is proposed. The algorithm uses the complete information available in the experiment and makes it possible to account for systematic measurement errors associated with the limited distinguishability of the logical states of ion qubits. We show that the developed model, although computationally more complex, contains significantly more information about the state of the qubit and provides a higher accuracy of state reconstruction compared to the model based on the threshold algorithm.Comment: 9 pages, 4 figure

The Production of a Forensic Examination and the Procedural Status of Knowledgeable Persons in Criminal Proceedings in Russia and Latvia

The article provides a comparative analysis of legal acts regulating the organization of forensic activities, as well as the legal status of knowledgeable persons in criminal proceedings in Russia and Latvia. Comparative legal analysis of normative acts consists in comparing the prescriptions of legal norms, legislative terms and definitions, allowing one to see the general and special, typical and unique in the regulation of forensic activities, as well as the rights and obligations, the volume and nature of the procedural functions of knowledgeable persons in criminal proceedings Russia and Latvia. The study is carried out on the basis of a comprehensive comparative legal analysis of the latest editions of criminal procedure laws (codes), laws in the field of organizing forensic activities in Russia and Latvia, by-laws, as well as other primary sources, including foreign ones, in the original language. Knowledgeable persons, i.e. persons applying special knowledge in criminal proceedings in Russia, are experts and specialists, in Latvia – experts, auditors and specialists. The legal status of knowledgeable persons in criminal proceedings in Russia and Latvia is largely comparable, but not identical. And, despite the transformation of the criminal procedural legislation of Latvia, in accordance with international legal norms and standards of the European Union, the provision of Soviet law on the use by knowledgeable persons of special knowledge in legal proceedings was preserved in the Latvian criminal process. The Code of Criminal Procedure of Russia classifies an expert and a specialist as other participants in criminal proceedings, that is, persons performing the function of promoting justice. Whereas the Latvian Criminal Procedure Law refers an expert and an auditor to persons having powers in criminal proceedings, a specialist – to other persons involved in criminal proceedings. And, if the expert and the auditor in the Criminal Procedure Law of Latvia are considered as independent participants in the criminal process, then the role of a specialist in legal proceedings is reduced to the level of “auxiliary personnel”. An expert and an auditor, according to the requirements of the Criminal Procedure Law of Latvia, are involved in criminal proceedings to give an opinion and fulfill the obligation to provide evidence, that is, as “means of ensuring judicial evidence”. Specialist – to assist officials performing procedural actions in fixing the progress and results of their conduct, using technical means to identify circumstances relevant to the case, but without conducting practical research in search of traces of a criminal act. The results of the comparative legal analysis of the normative acts regulating the rights, obligations, scope and nature of the procedural functions of knowledgeable persons in the criminal proceedings of Russia and Latvia allow us to expand our understanding of the application of special knowledge in the criminal proceedings of foreign states, as well as to critically assess the national criminal procedure legislation for the purpose of its further improvement and optimization. Based on the results of the study of the normative acts of Russia and Latvia, certain problematic aspects of the legal regulation of the procedural status of knowledgeable persons in the Russian criminal procedure legislation is noted, and generalizing conclusions are made

Quantum tomography based on principles of completeness, adequacy and fidelity

In this report we present a general approach for estimating quantum circuits by means of measurements. We apply the developed general approach for estimating the quality of superconducting and optical quantum chips. Using the methods of quantum states and processes tomography developed in our previous works, we have defined the adequate models of the states and processes under consideration.Comment: 9 pages, 7 figure

APPLICATION FEATURES OF FUZZY CONTROLLERS ON EXAMPLE OF DC MOTOR SPEED CONTROL

A prerequisite for the use of intelligent control methods, including algorithms of fuzzy logic, is increasing complexity in all industries, especially when parameters of technical systems while in operation vary in wide range. The paper provides comparative analysis of the basic types of common fuzzy direct action controllers on the example of speed control system in the DC motor drive. Design features of these types of fuzzy controllers are shown. Their comparison with traditional PI controller is carried out through the use of simulation, including the conditions of uncertainty expressed in changing of equivalent moment of inertia of the motor shaft. As a result, the conclusion about the feasibility of fuzzy PID-type controller application is made. The features of fuzzy controllers outlined in the paper can be summarized to more complex motor drive systems and to other non-linear systems that require the maintenance of any parameter within a given range

Анализ современных организационных и информационных технологий в управлении профессиональным здоровьем и профессиональным долголетием

At present, great importance is attached to the problem of maintaining the professional health of the working-age population and prolonging professional longevity in the world and in the Russian Federation. This problem has become especially urgent in recent years, in connection with the change in the country's retirement age

Актуальные направления развития исследований живых систем в условиях цифровизации страны

The main vectors of the development of an interdisciplinary methodology for studying the problem of living systems in the context of the implementation of the concept of digitalization of the state are considered. As a result of the research, it is established that the main directions of this development are the development and implementation of fundamental, exploratory and applied research of various living systems aimed at improving the efficiency of their functioning against the background of preserving the health and prolonging the longevity of the country’s population.Рассмотрены основные векторы развития междисциплинарной методологии изучения проблемы живых систем в условиях реализации концепции цифровизации государства. В результате исследований установлено, что главные направления этого развития состоят в разработке и реализации фундаментальных, поисковых и прикладных исследований различных живых систем, направленных на повышение эффективности их функционирования на фоне сохранения здоровья и продления долголетия населения страны