scholarly journals Numerical simulation of a controlled–controlled-not (CCN) quantum gate in a chain of three interacting nuclear spins system

2006 ◽  
Vol 39 (18) ◽  
pp. 3897-3904 ◽  
Author(s):  
G V López ◽  
L Lara
Keyword(s):  
Numerical Simulation ◽  
Quantum Gate ◽  
Nuclear Spins ◽  
A Chain

scholarly journals Simulation of a Complete Chain of QCA Cells with Realistic Potentials

VLSI Design ◽  
2001 ◽  
Vol 13 (1-4) ◽  
pp. 149-153
Author(s):  
M. Girlanda ◽  
M. Macucci
Keyword(s):  
Numerical Simulation ◽  
Bias Voltage ◽  
Polarization State ◽  
Applied Bias ◽  
Applied Bias Voltage ◽  
Voltage Unbalance ◽  
Complete Chain ◽  
A Chain ◽  
Realistic Potentials

We present a numerical simulation of the operation of a chain of 3 Quantum Cellular Automanton (QCA) cells, with the inclusion of a realistic procedure to enforce, with an externally applied bias voltage unbalance, the polarization of the first cell. The polarization state is shown to propagate correctly, as long as the bias unbalance applied to the electrodes of the first cell is not so large as to directly perturb nearby cells. The addition of dummy cells is needed to balance the asymmetries existing at the ends of a chain: this is an indication of further difficulties, that may become relevant if fabrication of more complex arrays is attempted.

scholarly journals Fidelity of noisy multiple-control reversible gates

2020 ◽  
Vol 23 (04) ◽  
pp. 385-392
Author(s):  
V.G. Deibuk ◽  
◽  
I.M. Yuriychuk ◽  
I. Lemberski ◽  
◽  
...  
Keyword(s):  
Frequency Control ◽  
Larmor Frequency ◽  
Interaction Constant ◽  
Frequency Noise ◽  
Nuclear Spins ◽  
Multiple Control ◽  
Correct Operation ◽  
Operation Algorithm ◽  
Semiconductor Matrix ◽  
A Chain

The effect of frequency noise on correct operation of the multiple-control Toffoli, Fredkin, and Peres gates has been discussed. In the framework of the Ising model, the energy spectrum of a chain of atoms with nuclear spins one-half in a spinless semiconductor matrix has been obtained, and allowed transitions corresponding to the operation algorithm of these gates have been determined. The fidelities of the obtained transitions were studied depending on the number of control qubits and parameters of the radio-frequency control pulses. It has been shown that correct operation of the Toffoli and Fredkin gates does not depend on the number of control qubits, while the Peres gate fidelity decreases significantly with the increasing number of control signals. The calculated ratios of the Larmor frequency to the exchange interaction constant correspond with the results of other studies.

Dielectric Response of a Chain of Disordered Polarizable Spheres: Numerical Simulation and Theory

1991 ◽  
Vol 253 ◽  
Author(s):  
Pedro VillaseiÑor-Gonzalez ◽  
Cecilia Noguez ◽  
Ruben G. Barrera
Keyword(s):  
Numerical Simulation ◽  
Dielectric Response ◽  
Linear Equations ◽  
Periodic Boundary Conditions ◽  
Dimensional System ◽  
Effective Response ◽  
Static Approximation ◽  
One Dimensional ◽  
Induced Dipole ◽  
A Chain

ABSTRACTWe applied to a one-dimensional system (1D) a recently developed diagrammatic formalism, in order to calculate the effective dielectric response of a chain of polarizable spheres embeded in an homogeneous host. The effective response is calculated within the dipolar, quasi-static approximation, through the summation of selected classes of diagrams. We compared our results with a numerical simulation, where the position of each sphere was generated at random and the induced dipole moment of each sphere was calculated by solving a set of linear equations through matrix inversion and using periodic boundary conditions.

scholarly journals The influence of the number of rotor blades on the performance of orthopter wind turbine

2018 ◽  
Vol 197 ◽  
pp. 08008
Author(s):  
Rachmat Firdaus ◽  
Takahiro Kiwata ◽  
Koji Nagao ◽  
Takaaki Kono
Keyword(s):  
Numerical Simulation ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Two Dimensional ◽  
Main Rotor ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
A Chain ◽  
Good Agreement

This paper describes the influence of the number of rotor blades the performance of the orthopter wind turbine. The orthopter wind turbine is combination between a drag-type and a lift-type vertical axis wind turbine which each blade combines a rotating movement around its own axis and a rotating movement around turbine's axis. In this case, the pitch of the blades was controlled by using a chain and sprockets arrangement to ensure that the blades rotated around their own axis by 360 degrees during the each two full revolution of the main rotor. To improve the performance of this wind turbine, the number of blades, was investigated by wind tunnel. By conducting two-dimensional unsteady CFD simulations, the power and torque of the vertical axis wind turbine and the flow around blades were also analyzed. The numerical simulation by using turbulence model predicted good agreement of the performance with experiment qualitatively.

Frequency Clustering in a Chain of Weakly Coupled Oscillators

1997 ◽  
Vol 52 (8-9) ◽  
pp. 578-580 ◽  
Author(s):  
Thomas Kirner ◽  
Otto E. Rössler
Keyword(s):  
Numerical Simulation ◽  
Small Intestine ◽  
Coupled Oscillators ◽  
Nonlinear Oscillators ◽  
Conduction System ◽  
Linear Parameter ◽  
Weakly Coupled ◽  
Coupled Nonlinear Oscillators ◽  
A Chain ◽  
Frequency Gradient

Abstract A numerical simulation of a chain of diffusively coupled nonlinear oscillators with a linear parameter gradient exhibits clusters of frequencies. The intention was to investigate the frequency-gradient in the stimulus conduction system of the heart. The phenomenon generalizes earlier findings on “frequency plateaus” described in the 1960's by Nicholas Diamant as a model of small-intestine transport. This “waxing and waining” phenomenon is a version of chaos. Thus, subtle chaos in the heart and waxing and waining type chaos in the intestine may be related.

scholarly journals Dual Nozzle Weapon Power Couple Vibration Controller With Delayed Rear Nozzle

2021 ◽  
Vol 2125 (1) ◽  
pp. 012034
Author(s):  
Xiong Chen ◽  
Ming Qiu ◽  
Jie Song ◽  
Longxu Ma ◽  
Zhenqiang Liao
Keyword(s):  
Numerical Simulation ◽  
Phase Flow ◽  
Two Phase ◽  
Flexible Coupling ◽  
External Injection ◽  
Coupling Dynamic ◽  
Power Couple ◽  
A Chain ◽  
Coupling Dynamic Model ◽  
Couple Vibration

Abstract Aiming at the problem that the firing accuracy of barrel weapon is affected by the violent vibration during continuous firing, a double-nozzle vibration controller using the energy of gunpowder gas in the chamber is proposed. The synchronous external injection of the double nozzles of the controller is realized by the delayed ejection of the rear nozzles, so as to generate a power couple to balance the recoil flipping torque of the barrel weapon to achieve the stable firing effect of reducing the bore vibration. A double-nozzle vibration controller with a delayed rear nozzle for a chain gun is designed. The rigid-flexible coupling dynamic model of a chain gun with a double-nozzles vibration controller was established considering the two-phase flow of propellant gas in the barrel and airway. The numerical simulation of the muzzle vibration characteristics of the original weapon and a chain gun equipped with a double-nozzles vibration controller is carried out respectively, and the effectiveness of the double-nozzles dynamic couple vibration controller for the continuous firing vibration control of the barrel weapon is verified.

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