Speeding up qubit control with bipolar single-flux-quantum pulse sequences

The development of quantum computers based on superconductors requires the improvement of the qubit state control approach aimed at the increase of the hardware energy efficiency. A promising solution to this problem is the use of superconducting digital circuits operating with single-flux-quantum (SFQ) pulses, moving the qubit control system into the cold chamber. However, the qubit gate time under SFQ control is still longer than under conventional microwave driving. Here we introduce the bipolar SFQ pulse control based on ternary pulse sequences. We also develop a robust optimization algorithm for finding a sequence structure that minimizes the leakage of the transmon qubit state from the computational subspace. We show that the appropriate sequence can be found for arbitrary system parameters from the practical range. The proposed bipolar SFQ control reduces a single qubit gate time by halve compared to nowadays unipolar SFQ technique, while maintaining the gate fidelity over 99.99%.Comment: 14 pages, 4 figure

SIMULATION OF ELECTRONIC EQUIPMENT ELEMENTS COOLING IN SOLIDWORKS

Hand in hand with the  integration increase of the up-to-date radio electronic equipment (REE) there grows substantially its design complexity, which is associated with an increase in the dimension of the problems solved   in the development process. The application of SAD SolidWorks is an effective way to solve this problem. The problem of calculating the parameters of the radiator cooling for continuous operation of one of the elements of REE is solved with the help of this system

Development and application of distributed computing system in inverse problems of fracture mechanics

Introduction. When solving problems that require processing of a large amount of data, the problem of obtaining a solution in an acceptable time arises. One of the ways to implement a time-resource constraint is to split the entire amount of computing between several data centers. Therefore, to develop methods to improve the speed of computing systems and the effectiveness of their use is an important task. The paper deals with the development of a distributed computing system to provide solutions to inverse problems in the field of fracture mechanics. The work objectives are the design, and calculation and experimental justification of the system for solving an ad-hoc type of tasks. Such software packages as ANSYS, COMSOL, and FlexPDE are used in the work. Materials and Methods. A methodology is proposed that allows for the use of ordinary PCs as processing centers, rather than specialized machines with preinstalled hardware. The system does not impose any special requirements on the hardware. For the system operation, the communication between PCs is necessary. The availability of the high-quality high-speed network is desirable. This simplifies the process of the system deployment, and increases the productivity of the computing process. A finite element model with a large set of parameters is calculated. Research Results. New software is developed to provide solutions to inverse problems in the field of fracture mechanics. The opportunity to use the system for solving a wider range of tasks is realized. Special features of similar software are taken into account in order to increase resiliency and reduce costs not related to the problem solution. The system executing module performs calculations in a multithreaded mode. Therefore, the hardware capabilities of computing tools are used with maximum efficiency. Simplicity in organizing the format of data storage and transferring them over the network made it possible to achieve the most optimal utilization of the available resources. Discussion and Conclusions. The developed system of distributed computations is used in performing finite element modeling of the ultrasonic wave propagation in the wall of a tube with a thin outer coating. The system provides a backup of data. This made it possible to reduce the possible losses of design data when some components of the system fail

Calculation of the movement trajectory of the grain mass in the field stripper

The work is devoted to the study of the dynamics of the grain mass in a field stripper for grain separation. At the first stage, a model of the movement of the air mass in the considered installation is built and based on a mathematical model that takes into account the turbulence of the movement of the air mass, using the method of finite volumes in the ANSYS package, the field of velocities and pressures is calculated. At the second stage, the movement of a fragment of the grain mass in this flow is considered, its trajectory is built taking into account the interaction with the upper deck of the installation. The performed calculations allow us to choose rational geometric and kinematic parameters at which no stagnant zones appear in the chamber, the grain mass interacts with the upper one, which contributes to the release of grain in the installation chamber

Mathematical and laboratory modeling of resonant impact on the spike for the purpose of grain selection

Mathematical and computer finite element model in the ACELAN package of resonant impact on a spike was developed and a full-scale experiment was carried out. Two installations are considered, one based on a cantilever, the free end of which acts on the spike, and the second is a semi-passive round bimorph. Excitation of vibrations is carried out using an actuator based on piezoceramic elements. In the first installation, low-frequency vibrations of the stem with a spike are excited and the resonance frequency is determined at which only an spike with grain performs intense vibrations. The second installation is designed to excite high-frequency vibrations at which resonant movements of the grains themselves arise. The purpose of both installations is to separate the grain from the spike using resonance phenomena

Finite Element and Applied Models of the Stem with Spike Deformation

This article examines the static and dynamic deformation of the stem of an ear of wheat and of the individual grain. The purpose of the article is to determine the factors of influence on the ear of wheat to isolate the grain. Two stages of grain ripening are considered: in the early stage, the grain is attached to the spike by the stem; in the second, there is no stem, and the grain is attached to the ear by the scales. The ear fluctuations are considered within the Euler–Bernoulli bar theory. The developed model divides the study of the dynamics of the stem of an ear and the dynamics of the grain into two stages. The first stage studies the dynamics of the plant as a whole, while the second stage studies the dynamics of an individual grain in a moving system associated with the ear in bending and vertical fluctuation forms. The model of the ear and the grain fluctuation uses the mechanical characteristics of elastic bonds and elastic bodies, which are determined by spring stiffness, elastic moduli, etc. The results show that in the vertical forms of grain fluctuation, the frequency of fluctuation is much higher than in the bending ones. This article presents the natural fluctuation frequencies of grain at full ripeness and in the early phases of maturation, at which point it is released from the ear