Quantum feedback control for qubit-qutrit entanglement

2016 ◽  
Vol 16 (7&8) ◽  
pp. 597-614
Author(s):  
Tiantian Ma ◽  
Jun Jing ◽  
Yi Guo ◽  
Ting Yu
Keyword(s):  
Feedback Control ◽  
Open System ◽  
Control Mechanism ◽  
Initial State ◽  
Level Atom ◽  
Control Scheme ◽  
Quantum Feedback ◽  
Local Feedback ◽  
Quantum Open System ◽  
Different Parts

We study a hybrid quantum open system consisting of two interacting subsystems formed by one two-level atom (qubit) and one three-level atom (qutrit). The quantum open system is coupled to an external environment (cavity) via the qubit-cavity interaction. It is found that the feedback control on different parts of the system (qubit or qutrit) gives dramatically different asymptotical behaviors of the open system dynamics. We show that the local feedback control mechanism acting on the qutrit subsystem is superior than that on the qubit in the sense of improving the entanglement. Particularly, the qutrit-control scheme may result in an entangled steady state, depending on the initial state.

Quantum speed limit time of a two-level atom under different quantum feedback control

2018 ◽  
Vol 27 (1) ◽  
pp. 010303
Author(s):  
Min Yu ◽  
Mao-Fa Fang ◽  
Hong-Mei Zou
Keyword(s):  
Feedback Control ◽  
Speed Limit ◽  
Level Atom ◽  
Quantum Feedback ◽  
Limit Time

scholarly journals Time-delayed local feedback control for a chaotic finance system

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Erfeng Xu ◽  
Yingrui Zhang ◽  
Yonggang Chen
Keyword(s):  
Feedback Control ◽  
Finance System ◽  
Local Feedback

Extended state observer–based output feedback control for spacecraft pose tracking with control input saturation

2021 ◽  
pp. 095441002110177
Author(s):  
Kejie Gong ◽  
Ying Liao ◽  
Yafei Mei
Keyword(s):  
Feedback Control ◽  
Output Feedback ◽  
Finite Time ◽  
Output Feedback Control ◽  
State Observer ◽  
Extended State Observer ◽  
Control Input ◽  
Extended State ◽  
Pose Tracking ◽  
Control Scheme

This article proposed an extended state observer (ESO)–based output feedback control scheme for rigid spacecraft pose tracking without velocity feedback, which accounts for inertial uncertainties, external disturbances, and control input constraints. In this research, the 6-DOF tracking error dynamics is described by the exponential coordinates on SE(3). A novel continuous finite-time ESO is proposed to estimate the velocity information and the compound disturbance, and the estimations are utilized in the control law design. The ESO ensures a finite-time uniform ultimately bounded stability of the observation states, which is proved utilizing the homogeneity method. A non-singular finite-time terminal sliding mode controller based on super-twisting technology is proposed, which would drive spacecraft tracking the desired states. The other two observer-based controllers are also proposed for comparison. The superiorities of the proposed control scheme are demonstrated by theory analyses and numerical simulations.

scholarly journals Feedback control of probability amplitudes for two-level atom in optical field

2008 ◽  
Vol 281 (4) ◽  
pp. 640-643 ◽  
Author(s):  
Saifullah
Keyword(s):  
Feedback Control ◽  
Optical Field ◽  
Level Atom

A Hierarchical Access Control Scheme Based on Lagrange Interpolation and ELGamal Algorithm with Numerical Experiments

2013 ◽  
Vol 385-386 ◽  
pp. 1705-1707
Author(s):  
Tzer Long Chen ◽  
Yu Fang Chung ◽  
Jian Mao Hong ◽  
Jeng Hong Jhong ◽  
Chin Sheng Chen ◽  
...  
Keyword(s):  
Access Control ◽  
Lagrange Interpolation ◽  
Control Mechanism ◽  
Key Generation ◽  
Electronic Documents ◽  
Control Scheme ◽  
Video Systems ◽  
Efficient Scheme ◽  
On Line ◽  
Access Control Mechanism

It is important to notice that the access control mechanism has been widely applied in various areas, such as on-line video systems, wireless network, and electronic documents. We propose an access control mechanism which is constructed based on two mathematical fundamentals: Lagrange interpolation and ElGamal algorithm. We conduct performance analysis to compare the efficiency of our proposed scheme with that of several related published schemes in both key generation phase and key derivation phase. Our new scheme is proven to be more efficient. It is shown, as expected, a more efficient scheme provides relatively less security and a more secure scheme is relatively less efficient for private keys of the same size.

SISO modelling of a web server to be controlled by a Feedback control scheme

2011 ◽  
Author(s):  
Atika Badaoui ◽  
Malik Loudini ◽  
Walid-Khaled Hidouci
Keyword(s):  
Feedback Control ◽  
Web Server ◽  
Control Scheme
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