A passive CPHASE gate via cross-Kerr nonlinearities
Quantum Physics
2016-08-22 v3 Optics
Abstract
A fundamental and open question is whether cross-Kerr nonlinearities can be used to construct a controlled-phase (CPHASE) gate. Here we propose a gate constructed from a discrete set of atom-mediated cross-Kerr interaction sites with counter-propagating photons. We show that the average gate fidelity between a CPHASE and our proposed gate increases as the number of interaction sites increases and the spectral width of the photon decreases, e.g. with 12 sites we find .
Cite
@article{arxiv.1604.04278,
title = {A passive CPHASE gate via cross-Kerr nonlinearities},
author = {Daniel J. Brod and Joshua Combes},
journal= {arXiv preprint arXiv:1604.04278},
year = {2016}
}
Comments
4 pages (+ appendix), 4 figures. See companion paper http://arxiv.org/abs/1604.03914 . v3: Closer to published version