Is measurement-based feedback still better for quantum control systems?

2010 ◽  
Vol 59 (6) ◽  
pp. 333-339 ◽  
Author(s):  
Bo Qi ◽  
Lei Guo
Keyword(s):  
Control Systems ◽  
Quantum Control

scholarly journals Analytic controllability of time-dependent quantum control systems

2005 ◽  
Vol 46 (5) ◽  
pp. 052102 ◽  
Author(s):  
Chunhua Lan ◽  
Tzyh-Jong Tarn ◽  
Quo-Shin Chi ◽  
John W. Clark
Keyword(s):  
Control Systems ◽  
Quantum Control ◽  
Time Dependent

Quantum speed problem: Theoretical hints for control

2016 ◽  
Vol 14 (03) ◽  
pp. 1650014
Author(s):  
Alexandre Coutinho Lisboa ◽  
José Roberto Castilho Piqueira
Keyword(s):  
Control Systems ◽  
Performance Measures ◽  
Quantum Control ◽  
Quantum Information Processing ◽  
Performance Measure ◽  
Point Of View ◽  
Theoretical Point ◽  
Control Engineering ◽  
Time Performance ◽  
And Performance

The transition time between states plays an important role in designing quantum devices as they are very sensitive to environmental influences. Decoherence phenomenon is responsible for possible destructions of the entanglement that is a fundamental requirement to implement quantum information processing systems. If the time between states is minimized, the decoherence effects can be reduced, thus, it is advantageous to the designer to develop expressions for time performance measures. Quantum speed limit (QSL) problem has been studied from the theoretical point of view, providing general results. Considering the implementation of quantum control systems, as the decoherence phenomenon is unavoidable, it is important to apply these general results to particular cases, developing expressions and performance measures, to assist control engineering designers. Here, a minimum time performance measure is defined for quantum control problems, for time-independent or time-dependent Hamiltonians, and applied to some practical examples, providing hints that may be useful for researchers pursuing optimization strategies for quantum control systems.

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