Gallium arsenide (GaAs) quantum photonic waveguide circuits

Wang, J. et al. (2014) Gallium arsenide (GaAs) quantum photonic waveguide circuits. Optics Communications, 327, pp. 49-55. (doi: 10.1016/j.optcom.2014.02.040)

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Integrated quantum photonics is a promising approach for future practical and large-scale quantum information processing technologies, with the prospect of on-chip generation, manipulation and measurement of complex quantum states of light. The gallium arsenide (GaAs) material system is a promising technology platform, and has already successfully demonstrated key components including waveguide integrated single-photon sources and integrated single-photon detectors. However, quantum circuits capable of manipulating quantum states of light have so far not been investigated in this material system. Here, we report GaAs photonic circuits for the manipulation of single-photon and two-photon states. Two-photon quantum interference with a visibility of 94.9±1.3% was observed in GaAs directional couplers. Classical and quantum interference fringes with visibilities of 98.6±1.3% and 84.4±1.5% respectively were demonstrated in Mach–Zehnder interferometers exploiting the electro-optic Pockels effect. This work paves the way for a fully integrated quantum technology platform based on the GaAs material system.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert and Tanner, Dr Michael
Authors: Wang, J., Santamato, A., Jiang, P., Bonneau, D., Engin, E., Silverstone, J. W., Lermer, M., Beetz, J., Kamp, M., Höfling, S., Tanner, M. G., Natarajan, C. M., Hadfield, R. H., Dorenbos, S. N., Zwiller, V., O’Brien, J. L., and Thompson, M. G.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Communications
ISSN (Online):1873-0310

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
622331Lithium niobate integrated quantum photonicsRobert HadfieldEngineering & Physical Sciences Research Council (EPSRC)EP/I036273/1ENG - ENGINEERING ELECTRONICS & NANO ENG