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Springer series in optical sciences/SPringer series in optical sciences

Nonlinear Optics for Photonic Quantum Networks

Alex S. Clark, L. G. Helt, Matthew J. Collins, Chunle Xiong, Kartik A. Srinivasan, Benjamin J. Eggleton, Michael J. Steel

Published Jan 1, 2015• 1 citation
Publisher
DOI
10.1007/978-3-319-14992-9_12

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Optical nonlinearities at the single-photon level are key features to build efficient photon-photon gates and to implement quantum networks. Such optical nonlinearities can be obtained using an ideal two-level system such as a single atom coupled to an optical cavity. While efficient, such atom-photon interface however presents a fixed bandwidth, determined by the spontaneous emission time and thus the spectral width of the cavity-enhanced two-level transition, preventing an efficient transmission to bandwidth-mismatched atomic systems in a single quantum network. In the present work, we propose a tunable atom-photon interface making use of the direct dipole-dipole coupling of two slightly different atomic systems. We show that, when weakly coupled to a cavity mode and directly coupled through dipole-dipole interaction, the subradiant mode of two slightly detuned atomic systems is optically addressable and presents a widely tunable bandwidth and single-photon nonlinearity.