Efficient generation of spatially delocalised entangled states is at the heart of quantum information science. Generally flying qubits are proposed for long range entangling interactions, however here we introduce a bus-mediated alternative for this task. Our scheme permits efficient and flexible generation of deterministic two-qubit operator measurements and has links to the important concepts of mode-entanglement and repeat-until-success protocols. Importantly, unlike flying qubit protocols, our bus particle never contains information about the individual quantum states of the particles, hence is information-free.
@article{arxiv.quant-ph/0511084,
title = {Information free quantum bus for generating stabiliser states},
author = {Simon J. Devitt and Andrew D. Greentree and Lloyd C. L. Hollenberg},
journal= {arXiv preprint arXiv:quant-ph/0511084},
year = {2007}
}
Comments
7 pages, 3 figures: substantial changes, accepted in quant. inf. proc. Added details for physical bus scheme using coherent electronic transport (MRAP)