Quantum Trajectories

It has been usually assumed that under very general and common conditions the outcome of a collision experiment does not depend on the properties of the projectiles' beam [1]. However, recent evidence in ionization experiments [2] points to a breakdown of these conditions and a dependence of the collision outcome on the incident beam's coherence properties. These facts open the question of how is the result of a collision affected by the preparation of the projectiles' beam.
This thesis presents a study of this problem analyzing inconsistencies of the standard stationary formulation of the scattering theory [1], and how these can affect the interpretation of projectile's coherence effects in ion impact collision experiments. To get this done, the framework of the De Broglie-Bohm formulation [3, 4] was used, which has recently recovered its lost mommentum due to its ability to deal with novel weak measurement results [5, 6]. In addition, this formulation is an advantageous option to describe a number of physical problems of current interest, such as the method of quantum trajectories developed by Robert E. Wyatt [7], or the study of effects such as the appearance of vortices in multichannel processes [8].

Recent developments in quantum technology mean that is it now possible to manipulate systems and measure fermion fields (e.g. reservoirs of electrons) at the quantum level. This progress has motivated some recent work on filtering theory for quantum systems driven by fermion fields by Korotkov, Milburn and others. The purpose of this paper is to develop fermion filtering theory using the fermion quantum stochastic calculus. We explain that this approach has close connections to the classical filtering theory that is a fundamental part of the systems and control theory that has developed over the past 50 years.

Recent developments in quantum technology mean that is it now possible to manipulate systems and measure fermion fields (e.g. reservoirs of electrons) at the quantum level. This progress has motivated some recent work on filtering theory for quantum systems driven by fermion fields by Korotkov, Milburn and others. The purpose of this paper is to develop fermion filtering theory using the fermion quantum stochastic calculus. We explain that this approach has close connections to the classical filtering theory that is a fundamental part of the systems and control theory that has developed over the past 50 years.

Recent developments in quantum technology mean that is it now possible to manipulate systems and measure fermion fields (e.g. reservoirs of electrons) at the quantum level. This progress has motivated some recent work on filtering theory for quantum systems driven by fermion fields by Korotkov, Milburn and others. The purpose of this paper is to develop fermion filtering theory using the fermion quantum stochastic calculus. We explain that this approach has close connections to the classical filtering theory that is a fundamental part of the systems and control theory that has developed over the past 50 years.