We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, the pi phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Possible imperfections and experimental systems suitable for implementing the gate are discussed.
@article{arxiv.1001.0968,
title = {Photonic Phase Gate via an Exchange of Fermionic Spin Waves in a Spin Chain},
author = {Alexey V. Gorshkov and Johannes Otterbach and Eugene Demler and Michael Fleischhauer and Mikhail D. Lukin},
journal= {arXiv preprint arXiv:1001.0968},
year = {2010}
}
Comments
4 pages, 1 figure. V2: extended the discussion of the main idea, removed supplementary information and inessential extensions, added references. V3: slightly modified references and text - final version as published in Phys. Rev. Lett