scholarly journals Quantum Control and Quantum Information Technology

2013 ◽  
Vol 2013 ◽  
pp. 1-2 ◽  
Author(s):  
Daoyi Dong ◽  
Chunlin Chen ◽  
Min Jiang ◽  
Lin-Cheng Wang
Keyword(s):  
Information Technology ◽  
Quantum Information ◽  
Quantum Control

scholarly journals Quantum control with a multi-dimensional Gaussian quantum invariant

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 409
Author(s):  
Selwyn Simsek ◽  
Florian Mintert
Keyword(s):  
Information Technology ◽  
Quantum Information ◽  
Control Problem ◽  
Ground State ◽  
Quantum Control ◽  
Spatial Dimension ◽  
Time Dependent ◽  
Quantum Invariants ◽  
Quantum Invariant ◽  
Trapped Ion

The framework of quantum invariants is an elegant generalization of adiabatic quantum control to control fields that do not need to change slowly. Due to the unavailability of invariants for systems with more than one spatial dimension, the benefits of this framework have not yet been exploited in multi-dimensional systems. We construct a multi-dimensional Gaussian quantum invariant that permits the design of time-dependent potentials that let the ground state of an initial potential evolve towards the ground state of a final potential. The scope of this framework is demonstrated with the task of shuttling an ion around a corner which is a paradigmatic control problem in achieving scalability of trapped ion quantum information technology.

scholarly journals INFORMATION-TECHNOLOGY APPROACH TO QUANTUM FEEDBACK CONTROL

2006 ◽  
Vol 20 (11n13) ◽  
pp. 1304-1316 ◽  
Author(s):  
DAO-YI DONG ◽  
CHEN-BIN ZHANG ◽  
ZONG-HAI CHEN ◽  
CHUN-LIN CHEN
Keyword(s):  
Information Technology ◽  
Quantum Information ◽  
Feedback Control ◽  
Information Acquisition ◽  
Quantum Control ◽  
State Recognition ◽  
Feedback Scheme ◽  
Quantum Control Theory ◽  
Quantum Feedback ◽  
Control Step

Quantum control theory is profitably reexamined from the perspective of quantum information, two results on the role of quantum information technology in quantum feedback control are presented and two quantum feedback control schemes, teleportation-based distant quantum feedback control and quantum feedback control with quantum cloning, are proposed. In the first feedback scheme, the output from the quantum system to be controlled is fed back into the distant actuator via teleportation to alter the dynamics of system. The result theoretically shows that it can accomplish some tasks such as distant feedback quantum control that Markovian or Bayesian quantum feedback can not complete. In the second feedback strategy, the design of quantum feedback control algorithms is separated into a state recognition step, which gives "on-off" signal to the actuator through recognizing some copies from the cloning machine, and a feedback (control) step using another copies of cloning machine. A compromise between information acquisition and measurement disturbance is established, and this strategy can perform some quantum control tasks with coherent feedback.

scholarly journals Quantum information technology

2003 ◽  
Vol 6 (1) ◽  
pp. 30-36 ◽  
Author(s):  
Timothy P Spiller
Keyword(s):  
Information Technology ◽  
Quantum Information

Phase control for entanglement preparation in two-qubit systems

2005 ◽  
Vol 5 (4&5) ◽  
pp. 364-379
Author(s):  
V.S. Malinovsky ◽  
I.R. Sola
Keyword(s):  
Quantum Information ◽  
Quantum Computation ◽  
Quantum Control ◽  
Phase Control ◽  
Adiabatic Passage ◽  
Pulse Parameters ◽  
Qubit System ◽  
Phase Manipulation ◽  
Laser Control ◽  
Pi Pulses

The theory of Quantum Control is starting to lay bridges with the field of Quantum Information and Quantum Computation. Using key ideas of laser control of the dynamics by means of phase manipulation and adiabatic passage, we review laser schemes that allow entanglement preparation in a two-qubit system. The schemes are based on sequences that use four time-delayed pulses, with or without concerted decay, in or off resonance with the intermediate levels of the qubit space. We show how to control the fidelity and phase of the entanglement, as well as the sensitivity of the preparation to the different pulse parameters. In general the schemes provide an improvement in robustness and in the finesse of the control to phase, with respect to previously proposed schemes based on sequences of $\pi$ pulses.

Enhancement of exciton emission in WS2 based on the Kerker effect from the mode engineering of individual Si nanostripes

2020 ◽  
Vol 5 (10) ◽  
pp. 1368-1377
Author(s):  
Jiahao Yan ◽  
Zhaoqiang Zheng ◽  
Zaizhu Lou ◽  
Juan Li ◽  
Bijun Mao ◽  
...  
Keyword(s):  
Information Technology ◽  
Quantum Information ◽  
Exciton Emission ◽  
Potential Applications

Coupling between nanostructures and excitons has attracted great attention for potential applications in quantum information technology.

The significance of theC-numerical range and the localC-numerical range in quantum control and quantum information

2008 ◽  
Vol 56 (1-2) ◽  
pp. 3-26 ◽  
Author(s):  
Thomas Schulte-herbrüggen ◽  
Gunther Dirr ◽  
Uwe Helmke ◽  
Steffen J. Glaser
Keyword(s):  
Quantum Information ◽  
Quantum Control ◽  
Numerical Range
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