We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow the preparation of atomic Bell pairs via selective excitation, suitable for quantum information processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a "loophole free" Bell test in a single laboratory.
@article{arxiv.0712.2486,
title = {Entangling identical bosons in optical tweezers via exchange interaction},
author = {Nathan S. Babcock and Rene Stock and Mark G. Raizen and Barry C. Sanders},
journal= {arXiv preprint arXiv:0712.2486},
year = {2008}
}