Demonstration of a quantum nondemolition sum gate
Quantum Physics
2009-11-13 v1
Abstract
The sum gate is the canonical two-mode gate for universal quantum computation based on continuous quantum variables. It represents the natural analogue to a qubit C-NOT gate. In addition, the continuous-variable gate describes a quantum nondemolition (QND) interaction between the quadrature components of two light fields. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U.L. Andersen [\pra {\bf 71}, 042308 (2005)], solely based on offline squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.
Cite
@article{arxiv.0808.0551,
title = {Demonstration of a quantum nondemolition sum gate},
author = {Jun-ichi Yoshikawa and Yoshichika Miwa and Alexander Huck and Ulrik L. Andersen and Peter van Loock and Akira Furusawa},
journal= {arXiv preprint arXiv:0808.0551},
year = {2009}
}
Comments
4 pages, 4 figures