Quantum Information Seminar Series

The Quantum Governor: Automatic Quantum Control and Reduction of the Influence of Noise Without Measuring

Shimshon Kallush
The Fritz-Haber Center for Molecular Dynamics Research
The Hebrew University, Jerusalem, Israel

The problem of automatically controlling a quantum system in a closed circle is discussed. Relations between the quantum version of the classical Watt’s governor machinery and the fields of quantum information and quantum error correction methods, e.g., the Bang-Bang (BB) scheme for Dynamical Decoupling (DD), are put into a frame. A general scheme for reducing the influence of noise on quantum systems is sketched. The scheme is built from two steps. First, a distillation step by which undesired components are removed to another degree of freedom of the system, and second, a recovering step by which the system gains back its initial density is taking place. An Optimal-Control based method is used to generate the distilling operator. The scheme is demonstrated by a simulation of a two level byte influenced by white noise. Undesired deviations from the target were shown to be reduced by at least two orders of magnitude on average.

Tuesday, September 6, 2005
4:00 PM
Gant Science Complex
Physics Department
Room P121

© 2005 Department of Physics, University of Connecticut
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