In this paper, we propose a new direction of research for the realization of the quantum controlled-not gate based on a technique called ``interaction-free measurement'', where qubits are two-level atoms (or ions) and information is mediated from one qubit to another by lasers in superpositions of π and 2π pulses. We investigate the advantages and limitations of such a gate and discuss possible applicability.
@article{arxiv.quant-ph/0109105,
title = {Interaction-Free Measurement applied to Quantum Computation: a New CNOT Gate},
author = {A. A. Methot and Kai Wicker},
journal= {arXiv preprint arXiv:quant-ph/0109105},
year = {2007}
}