Experimental imperfections induce phase and population errors in quantum systems. We present a method to compensate unitary affecting also the of qubit states. This is achieved through interaction target with an additional control qubit. show that our approach works well for single-photon two-photon excitation schemes. In first case, we study two reduced models (i) two-level system which corres...

This paper presents an algorithm to compensate the systematic error of lasers line scanned data based on measurement model system. The iterative process is used determine geometrical features accurately, solely making use optical device. task-specific reduced by algorithm. validation consists evaluation multiple compensated measurements calibrated ring gauges with different diameters and simila...

The method of end-effector pose accuracy improvement using joint error mutual compensation for robotic manipulators with rotation joints was presented. The computer simulation and experiments of the developed method showed that it was possible to perform the technological operations with a higher accuracy in the special areas of the robot working space using the developed approach. The method p...

We analyze the effect of environment on the gate operation of flux-biased phase qubits. We employ the master equation for a reduced density matrix of the qubit system coupled to an Ohmic environment, described by the Caldeira-Leggett model. Numerically solving this equation, we evaluate the gate error as a function of gate time, temperature, and environmental coupling strength for experimentall...

In boundary integral methods it is often necessary to evaluate layer potentials on or close to the boundary, where the underlying integral is difficult to evaluate numerically. Quadrature by expansion (QBX) is a new method for dealing with such integrals, and it is based on forming a local expansion of the layer potential close to the boundary. In doing so, one introduces a new quadrature error...

A hardware detector for constant envelope quadrature-quadrature phase-shift keying (CEQPSK) is proposed. It uses appropriate hard decisions; yet, it achieves optimum probability of bit error performance, unlike the suboptimum detector of Saha and Birdsall. This optimum performance is verified through Monte Carlo computer simulations. Additionally, a more correct expression is given for the prob...