Filtering and Control in Quantum Optics

Details Filtering and Control in Quantum Optics Filtering and Control in Quantum Optics

2004-10-11

arxiv.org/abs/quant-ph/0410080v2

Physics

Quantum Physics

PhD thesis, University of Nijmegen, 2004

Scientific paper

In this thesis we study continuously observed open quantum systems from the point of view of quantum filtering theory. The conditioned state of the open system obeys a non-commutative or quantum analogue of the Kushner-Stratonovich equation in classical filtering theory. The thesis consists out of four chapters. The first chapter is a brief introduction to quantum probability theory and quantum stochastic calculus. The second chapter is a description of a photon counting experiment in continuous time within the framework of Davies and Srinivas. The third chapter focusses on the derivation of the quantum filtering or Belavkin equation from the quantum stochastic differential equation governing the interaction between the open system and its environment, the electromagnetic field. The fourth chapter shows how the quantum filtering equation can be used to control quantum systems.

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