Quantum state engineering assisted by entanglement
摘要
We suggest a general scheme for quantum state engineering based on conditional measurements carried out on entangled twin-beam of radiation. Realistic detection schemes such as {\sc on/off} photodetection, homodyne detection and joint measurement of two-mode quadratures are analyzed in details. Imperfections of the apparatuses, such as nonunit quantum efficiency and finite resolution, are taken into account. We show that conditional {\sc on/off} photodetection provides a reliable scheme to verify nonclassicality, whereas conditional homodyning represents a tunable and robust source of squeezed light. We also describe optical teleportation as a conditional measurement, and evaluate the degrading effects of finite amount of entanglement, decoherence due to losses, and nonunit quantum efficiency.
引用
@article{arxiv.quant-ph/0211127,
title = {Quantum state engineering assisted by entanglement},
author = {Matteo G. A. Paris and Mary Cola and Rodolfo Bonifacio},
journal= {arXiv preprint arXiv:quant-ph/0211127},
year = {2009}
}
备注
Some pics with low resolution. Originals at http://www.qubit.it