We propose a novel scheme for the preparation of a maximally entangled state of two atoms in an optical cavity. Starting from an arbitrary initial state, a singlet state is prepared as the unique fixed point of a dissipative quantum dynamical process. In our scheme, cavity decay is no longer undesirable, but plays an integral part in the dynamics. As a result, we get a qualitative improvement in the scaling of the fidelity with the cavity parameters. Our analysis indicates that dissipative state preparation is more than just a new conceptual approach, but can allow for significant improvement as compared to preparation protocols based on coherent unitary dynamics.
@article{arxiv.1011.1441,
title = {Dissipative preparation of entanglement in optical cavities},
author = {M. J. Kastoryano and F. Reiter and A. S. Sørensen},
journal= {arXiv preprint arXiv:1011.1441},
year = {2011}
}