The effect of focusing on polarization qubits
Quantum Physics
2007-05-23 v2
Abstract
When a photon with well-defined polarization and momentum passes through a focusing device, these properties are no longer well defined. Their loss is captured by describing polarization by a 3x3 effective density matrix. Here we show that the effective density matrix corresponds to the actual photodetection model and we provide a simple formula to calculate it in terms of classical fields. Moreover, we explore several possible experimental consequences of the "longitudinal" term: limits on single-photon detection efficiency, polarization-dependent atomic transitions rates and the implications on quantum information processing.
Cite
@article{arxiv.quant-ph/0403029,
title = {The effect of focusing on polarization qubits},
author = {Netanel H. Lindner and Daniel R. Terno},
journal= {arXiv preprint arXiv:quant-ph/0403029},
year = {2007}
}
Comments
7 pages, RevTeX4, 2 eps figure; published version