Quantum Information Processing Through Quantum Dots in Slow-Light Photonic Crystal Waveguides
Benisty, H. and Ozbay, E. and Soukoulis, C. M. and Di Falco, A. and Lapine, M. and Tassin, P. and Vanwolleghem, M.
We propose a scheme to realize controlled phase-flip gate between two single photons through a single quantum dot (QD) in a slow-light photonic crystal (PhC) waveguide. Enhanced Purcell factor and large β-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system. The excellent physical integration of this PhC waveguide system provides tremendous potential for large-scale quantum information processing. Then we generalize to a multi-atom controlled phase-flip gate based on waveguide system in Sagnac interferometer. Through the Sagnac interferometer, the single photon adds the phase-flip operation on the atomic state without changing the photonic state. The controlled phase-flip gate on the atoms can be successfully constructed with high fidelity in one step, even without detecting the photon.
C. W. Wong et al., "Quantum Information Processing Through Quantum Dots in Slow-Light Photonic Crystal Waveguides," Photonics and Nanostructures - Fundamentals and Applications, Elsevier, Jan 2009.
The definitive version is available at http://dx.doi.org/10.1016/j.photonics.2008.11.007
Mechanical and Aerospace Engineering
Keywords and Phrases
Photonic Crystal Waveguides; Quantum Dots; Sagnac Interferometer; Quatum Information Processing
Article - Journal
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