Quantum state tomography using a single apparatus
Quantum Physics
2012-05-25 v3 Statistical Mechanics
Abstract
The density matrix of a two-level system (spin, atom) is usually determined by measuring the three non-commuting components of the Pauli vector. This density matrix can also be obtained via the measurement data of two commuting variables, using a single apparatus. This is done by coupling the two-level system to a mode of radiation field, where the atom-field interaction is described with the Jaynes--Cummings model. The mode starts its evolution from a known coherent state. The unknown initial state of the atom is found by measuring two commuting observables: the population difference of the atom and the photon number of the field. We discuss the advantages of this setup and its possible applications.
Cite
@article{arxiv.0708.1918,
title = {Quantum state tomography using a single apparatus},
author = {B. Mehmani and A. E. Allahverdyan and Th. M. Nieuwenhuizen},
journal= {arXiv preprint arXiv:0708.1918},
year = {2012}
}
Comments
7 pages, 8 figure, Phys. Rev. A