The Series Product and Its Application to Quantum Feedforward and Feedback Networks

Details The Series Product and Its Application to Quantum Feedforward and Feedback Networks The Series Product and Its Application to Quantum Feedforward and Feedback Networks

2007-06-30

arxiv.org/abs/0707.0048v3

Physics

Quantum Physics

To appear, IEEE Transactions on Automatic Control, 2009

Scientific paper

The purpose of this paper is to present simple and general algebraic methods for describing series connections in quantum networks. These methods build on and generalize existing methods for series (or cascade) connections by allowing for more general interfaces, and by introducing an efficient algebraic tool, the series product. We also introduce another product, which we call the concatenation product, that is useful for assembling and representing systems without necessarily having connections. We show how the concatenation and series products can be used to describe feedforward and feedback networks. A selection of examples from the quantum control literature are analyzed to illustrate the utility of our network modeling methodology.

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