A conditional-phase switch at the single-photon level
量子物理
2009-11-07 v1
摘要
We present an experimental realization of a two-photon conditional-phase switch, related to the ``-'' gate of quantum computation. This gate relies on quantum interference between photon pairs, generating entanglement between two optical modes through the process of spontaneous parametric down-conversion (SPDC). The interference effect serves to enhance the effective nonlinearity by many orders of magnitude, so it is significant at the quantum (single-photon) level. By adjusting the relative optical phase between the classical pump for SPDC and the pair of input modes, one can impress a large phase shift on one beam which depends on the presence or absence of a single photon in a control mode.
引用
@article{arxiv.quant-ph/0205109,
title = {A conditional-phase switch at the single-photon level},
author = {K. J. Resch and J. S. Lundeen and A. M. Steinberg},
journal= {arXiv preprint arXiv:quant-ph/0205109},
year = {2009}
}
备注
8 pages, 4 figures