Quantum Information Seminar Series
The Quantum Governor: Automatic Quantum Control and Reduction of the Influence of Noise Without Measuring
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
Gant Science Complex