We outline a toolbox comprised of passive optical elements, single photon detection and superpositions of coherent states (Schrodinger cat states). Such a toolbox is a powerful collection of primitives for quantum information processing tasks. We illustrate its use by outlining a proposal for universal quantum computation. We utilize this toolbox for quantum metrology applications, for instance weak force measurements and precise phase estimation. We show in both these cases that a sensitivity at the Heisenberg limit is achievable.
@article{arxiv.quant-ph/0312194,
title = {Schrodinger cats and their power for quantum information processing},
author = {A. Gilchrist and Kae Nemoto and W. J. Munro and T. C. Ralph and S. Glancy and Samuel. L. Braunstein and G. J. Milburn},
journal= {arXiv preprint arXiv:quant-ph/0312194},
year = {2009}
}
Comments
10 pages, 5 figures; Submitted to a Special Issue of J. Opt. B on "Fluctuations and Noise in Photonics and Quantum Optics" (Herman Haus Memorial Issue)