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Kojima, Kunihiro; Sasaki, Keiji; Hofmann, Holger F.; Takeuchi, Shigeki; PRESTO, Japan Science and Technology Corporation
Physical review. A, Atomic, molecular, and optical physics, 07/2004, Volume: 70, Issue: 1Journal Article
We investigate the single-mode operation of a quantum optical nonlinear {pi} phase-shift gate implemented by a single two-level atom in one-dimensional free space. Since the single-mode property of the input photons at the atom is not preserved in the interaction at the atom, we analyze the efficiency of single-mode operation that can still be achieved. We show how the input pulse shape can be optimized to obtain high efficiencies for the nonlinear single-mode operation. With this analysis, we obtain an optimal single-mode transmittance per photon of 78% for the successful nonlinear {pi} phase-shift operation.
