Comment on Photon Exchange Interactions

Details Comment on Photon Exchange Interactions Comment on Photon Exchange Interactions

2004-05-24

arxiv.org/abs/quant-ph/0405141v1

Phys. Rev. A 70, 054301 (2004).

Physics

Quantum Physics

7 pages, 2 figures

Scientific paper

10.1103/PhysRevA.70.054301

We previously suggested that photon exchange interactions could be used to produce nonlinear effects at the two-photon level, and similar effects have been experimentally observed by Resch et al. (quant-ph/0306198). Here we note that photon exchange interactions are not useful for quantum information processing because they require the presence of substantial photon loss. This dependence on loss is somewhat analogous to the postselection required in the linear optics approach to quantum computing suggested by Knill, Laflamme, and Milburn [Nature 409, 46 (2001)].

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